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Back Pain Solved: Your Top Questions and Answers on Diagnosis

23 Apr 2026 115 min read 177 Views
Illustration of question and answer - Dr. Mohammed Hutaif

Key Takeaway

For anyone wondering about Back Pain Solved: Your Top Questions and Answers on Diagnosis, Back pain may require medical attention if it persists over 3 months, radiates to legs, causes weakness, or affects bladder/bowel control. Diagnosis involves reviewing symptoms, physical exams, and tests like X-rays or MRIs. Treatment options, determined through a focused question and answer process, range from conservative care like physical therapy to surgical intervention for severe conditions.

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Question 1

A 65-year-old male presents with chronic low back pain that significantly worsens with prolonged standing and walking, but improves with sitting or leaning forward (e.g., pushing a shopping cart). He describes bilateral leg pain and numbness that is relieved by rest. On examination, he has intact motor strength, normal reflexes, and no sensory deficits in a dermatomal pattern. Which of the following is the most likely diagnosis?





Explanation

The patient's classic presentation of neurogenic claudication, characterized by back and leg pain worsening with standing/walking and improving with sitting or leaning forward (the 'shopping cart sign'), is highly suggestive of lumbar spinal stenosis. This condition results from narrowing of the spinal canal, leading to compression of the neural elements. While spondylolisthesis can cause stenosis, the primary description points to the stenotic symptoms themselves. Lumbar disc herniation typically presents with more acute, radicular pain, often worsened with sitting and relieved by standing or walking short distances. Piriformis syndrome causes buttock pain with radiation down the leg, but less commonly presents with true neurogenic claudication relieved by leaning forward. A vertebral compression fracture would present with more acute, localized pain, often related to trauma or osteoporosis.

Question 2

A 32-year-old male competitive weightlifter complains of persistent, deep, aching low back pain that began subtly and gradually worsened over several months. The pain is exacerbated by lumbar extension and resisted hip flexion, and he reports a 'catch' when transitioning from flexion to extension. Physical examination reveals tenderness to palpation over the L5-S1 region and a positive single-leg hyperextension test (Stork test). Neurological examination is unremarkable. Which imaging study would be most appropriate for initial evaluation?





Explanation

The patient's history (young athlete, extension-related pain, 'catch', tenderness over L5-S1, positive Stork test) is highly suggestive of spondylolysis, particularly a pars interarticularis defect. While MRI can visualize soft tissues well, plain radiographs including oblique views are the initial imaging of choice to diagnose spondylolysis by demonstrating the 'Scottie dog' collar defect in the pars interarticularis. If plain films are inconclusive or further characterization is needed, a CT scan might follow, especially for visualizing bone detail. MRI is excellent for disc and neural structures but less sensitive for early pars defects. A bone scan might be used to assess for active stress reaction in the pars, but radiographs are first-line for structural defects. EMG/NCS are for evaluating nerve impingement and are not indicated here as the neurological exam is unremarkable.

Question 3

A 70-year-old woman with a history of osteoporosis presents to the emergency department with severe, acute onset back pain after a minor fall. The pain is localized to the mid-thoracic region and worsens with movement, coughing, or sneezing. On examination, she has tenderness to palpation over the T8 spinous process and increased thoracic kyphosis. Neurological examination is normal. What is the most likely diagnosis?





Explanation

The acute onset of severe, localized thoracic back pain following a minor trauma in an elderly osteoporotic patient is classic for a vertebral compression fracture. The pain worsens with movement, coughing, or sneezing due to increased intra-abdominal pressure transmitted to the fractured vertebra. Increased thoracic kyphosis is a common sequela of multiple compression fractures. Lumbar disc herniation typically causes pain radiating to the leg. A spinal epidural abscess would present with fever, malaise, and rapidly progressive neurological deficits. Acute lumbar muscle strain is less likely to cause such severe, localized pain in the thoracic region after a fall, especially in an osteoporotic patient. While metastatic spinal tumors are a consideration in this age group, acute onset pain after minor trauma points more strongly to a fracture initially, though further workup may be warranted.

Question 4

A 45-year-old female presents with low back pain and unilateral leg pain extending below the knee. She reports numbness in the lateral aspect of her foot and weakness during ankle dorsiflexion. Her patellar reflex is normal, but the ankle jerk reflex is diminished. A positive straight leg raise test is elicited on the affected side. Based on these findings, which nerve root is most likely compressed?





Explanation

The clinical presentation points to an S1 radiculopathy. Weakness in ankle dorsiflexion (primarily tibialis anterior) is L4/L5, but the combination with numbness in the lateral aspect of the foot (S1 dermatome) and a diminished ankle jerk reflex (S1 reflex) strongly points to S1 nerve root compression. L3 radiculopathy affects the knee jerk reflex and sensation over the medial thigh. L4 radiculopathy affects the patellar reflex and sensation over the medial leg. L5 radiculopathy affects great toe extension and sensation over the dorsum of the foot, but usually spares the ankle jerk reflex. The positive straight leg raise test is non-specific for the level but indicates nerve root irritation.

Question 5

A 55-year-old obese male presents with sudden onset, excruciating back pain radiating bilaterally into the buttocks and posterior thighs, associated with saddle anesthesia, bilateral lower extremity weakness, and difficulty initiating urination. What is the immediate management priority?





Explanation

This patient's symptoms (saddle anesthesia, bilateral leg weakness, and bladder/bowel dysfunction, specifically difficulty with urination) are pathognomonic for cauda equina syndrome, a surgical emergency. The immediate management priority is to confirm the diagnosis with an emergent MRI of the lumbar spine and proceed with urgent surgical decompression to prevent permanent neurological deficits. Delay can lead to irreversible bladder, bowel, and sexual dysfunction, as well as motor and sensory loss. NSAIDs, muscle relaxants, physical therapy, and oral corticosteroids are inappropriate and would delay definitive treatment.

Question 6

Which of the following findings is most concerning for an underlying inflammatory (spondyloarthropathy) cause of chronic low back pain, rather than mechanical back pain?





Explanation

Inflammatory back pain, characteristic of spondyloarthropathies (e.g., ankylosing spondylitis), typically improves with exercise and is worse with rest or immobility, particularly in the morning. The morning stiffness associated with inflammatory back pain often lasts longer than 30 minutes, sometimes several hours. Mechanical back pain, conversely, is usually exacerbated by activity and relieved by rest, has shorter morning stiffness, and commonly has onset in older individuals. Radicular symptoms can occur in both, but are not primarily indicative of inflammatory vs. mechanical origin. The cardinal features distinguishing inflammatory back pain include insidious onset, age of onset < 40 years, duration > 3 months, morning stiffness > 30 minutes, improvement with exercise, and not improving with rest.

Question 7

A 28-year-old nurse reports dull, aching low back pain that began insidiously and is worse after her shifts, especially when lifting patients. The pain is localized to the paraspinal muscles and occasionally radiates into the buttocks, but not down the leg. Neurological examination is entirely normal. She denies any 'red flag' symptoms. What is the most appropriate initial management?





Explanation

This presentation is highly consistent with acute or subacute mechanical low back pain, likely musculoligamentous strain. Given the absence of 'red flag' symptoms (fever, weight loss, neurological deficits, saddle anesthesia, bladder/bowel changes, history of cancer, severe nocturnal pain) and the typical nature of the pain (related to activity, localized), conservative management is the mainstay. This includes activity modification (avoiding exacerbating activities), non-steroidal anti-inflammatory drugs (NSAIDs) for pain relief, and physical therapy to improve core strength, flexibility, and body mechanics. Imaging like MRI is not indicated initially in the absence of red flags or persistent symptoms after a trial of conservative care. Oral steroids are not first-line for mechanical back pain. Urgent surgical consultation is for neurological emergencies or severe, refractory radiculopathy. A bone scan is not indicated without specific features suggesting stress fracture or tumor.

Question 8

Which of the following 'red flag' symptoms in a patient presenting with back pain necessitates immediate and thorough investigation?





Explanation

Unexplained weight loss or a history of cancer are significant 'red flags' for serious underlying conditions such as metastatic disease, spinal tumors, or infection. These findings warrant immediate and thorough investigation, often including imaging (MRI or CT) and potentially blood tests. Pain radiating to the buttock is common in mechanical back pain and radiculopathy, not necessarily a red flag. Morning stiffness lasting 15 minutes is typical of mechanical back pain. Pain relief with rest is also characteristic of mechanical pain. Intermittent numbness in one leg, while concerning, is less immediately alarming than signs of systemic disease or malignancy, especially if not associated with progressive weakness or cauda equina symptoms.

Question 9

A 60-year-old male presents with worsening low back pain and progressive weakness in both lower extremities over the past 2 weeks. He reports difficulty walking and has noticed a change in his gait. Examination reveals hyperreflexia in the lower extremities, positive Babinski signs bilaterally, and diminished proprioception in the feet. Which of the following conditions is most likely?





Explanation

The combination of progressive bilateral lower extremity weakness, hyperreflexia, positive Babinski signs, and gait disturbance points to an upper motor neuron lesion affecting the spinal cord. Given the back pain and lower extremity symptoms, a spinal cord compression (myelopathy) is the likely diagnosis. Spinal epidural abscess can cause myelopathy if high enough, but the most precise answer is myelopathy. Cervical myelopathy would involve upper extremity symptoms more prominently, although severe cervical myelopathy can cause only leg symptoms. Cauda equina syndrome is a lower motor neuron lesion, characterized by saddle anesthesia, flaccid weakness, diminished reflexes, and bladder/bowel dysfunction. Lumbar disc herniation with L5 radiculopathy is typically unilateral and causes lower motor neuron signs (flaccid weakness, hyporeflexia). Lumbar spinal stenosis can cause neurogenic claudication, but typically without upper motor neuron signs.

Question 10

Which characteristic is most indicative of a discogenic source of low back pain?





Explanation

Discogenic pain, particularly due to disc herniation, is often exacerbated by activities that increase intradiscal pressure or stretch the affected nerve root. These include sitting, forward flexion, and maneuvers like coughing, sneezing, or Valsalva, which increase intra-abdominal pressure and consequently epidural pressure. Pain worse with standing and walking and relieved with sitting is classic for spinal stenosis. Pain relieved by extension exercises is often associated with facet joint pathology. A positive femoral nerve stretch test suggests upper lumbar radiculopathy (L2, L3, L4). Nocturnal pain unrelated to position is a 'red flag' suggestive of tumor or infection.

Question 11

A 40-year-old patient presents with chronic low back pain. MRI reveals degenerative changes at L4-L5, including disc space narrowing, endplate sclerosis, and osteophytes. No significant neural compression is observed. Physical examination reveals localized tenderness over the L4-L5 facet joints, and pain is reproduced with extension and rotation of the lumbar spine. Which is the most appropriate initial intervention?





Explanation

The clinical presentation (chronic low back pain, tenderness over facet joints, pain with extension and rotation) and imaging findings (degenerative changes, no neural compression) are consistent with facet joint arthropathy. Initial management for facet pain typically begins with conservative measures. Physical therapy focusing on core strengthening, postural correction, and flexibility is a cornerstone of non-operative treatment for mechanical back pain, including facet arthropathy. Epidural steroid injections are more commonly used for radicular pain. Radiofrequency ablation may be considered if diagnostic facet injections provide temporary relief, indicating the facet joints are indeed the pain generators. Fusion surgery is a last resort for chronic, intractable pain, and not indicated without significant instability or neurological deficits. Long-term opioid therapy is generally discouraged due to risks of dependence and limited long-term efficacy.

Question 12

Which of the following physical examination findings is most specific for nerve root compression in the lumbar spine?





Explanation

Motor weakness in a specific myotome (e.g., L5 weakness affecting great toe extension or S1 weakness affecting plantarflexion) is a highly specific sign of nerve root compression (radiculopathy). Paraspinal muscle spasm, reduced lumbar range of motion, and localized tenderness are common findings in various musculoskeletal back conditions and are not specific for nerve root compression. A positive FABER (Flexion, Abduction, External Rotation) test suggests sacroiliac joint or hip pathology, not primarily nerve root compression.

Question 13

A 12-year-old gymnast presents with chronic low back pain that is worse with hyperextension activities. She denies any neurological symptoms. Radiographs are normal. What is the most appropriate next step in diagnosis?





Explanation

In a young athlete with back pain exacerbated by hyperextension and normal radiographs, a stress fracture of the pars interarticularis (spondylolysis) should be strongly suspected. While plain radiographs are the initial step, early stress reactions or non-displaced fractures may not be visible. A SPECT (Single Photon Emission Computed Tomography) bone scan, often combined with CT, is highly sensitive for detecting active stress reactions or early spondylolysis. MRI is excellent for soft tissue, but early pars lesions can be missed if not specifically looked for. CT provides excellent bone detail and can visualize a pars defect. EMG is for nerve function, not bony injury. Observation alone without further diagnostic workup risks progression of the injury.

Question 14

A 50-year-old male with a history of prostate cancer presents with new-onset, severe low back pain that is constant, dull, and worse at night, not relieved by rest. He denies any recent trauma. Neurological examination is unremarkable. Which diagnostic test is most critical at this stage?





Explanation

Given the patient's history of prostate cancer and new-onset, constant, nocturnal back pain (a red flag for malignancy), metastatic disease to the spine is a primary concern. MRI of the lumbar spine with gadolinium is the most sensitive and specific imaging modality for detecting spinal metastases, epidural cord compression, and other soft tissue pathology related to cancer. Plain radiographs might show osteolytic or osteoblastic lesions but can be normal in early metastatic disease. A CT scan of the abdomen/pelvis would assess primary tumor status but is less detailed for the spine itself. Bone density scan is for osteoporosis. ESR/CRP are inflammatory markers but less specific than MRI for identifying the source of pain in this context.

Question 15

A patient presents with acute onset low back pain and left leg pain that started after lifting a heavy object. The pain radiates down the posterior aspect of the left thigh and calf to the foot. On examination, there is decreased sensation in the lateral aspect of the left foot and weakness in left plantarflexion. The ankle jerk reflex is absent on the left. Which level of disc herniation is most likely responsible?





Explanation

This constellation of symptoms is classic for an L5-S1 disc herniation compressing the S1 nerve root. S1 radiculopathy typically presents with pain radiating down the posterior leg, sensory loss in the lateral foot/plantar aspect, weakness in plantarflexion (gastrocnemius/soleus), and an absent or diminished ankle jerk reflex. L4-L5 disc herniation typically affects the L5 nerve root, causing pain radiating to the dorsum of the foot, weakness in great toe extension/ankle dorsiflexion, and no reflex changes (though the medial hamstring reflex can be affected). L3-L4 affects the L4 nerve root, causing quadriceps weakness and diminished patellar reflex.

Question 16

Which of the following is NOT typically considered a 'red flag' symptom warranting immediate investigation in a patient presenting with back pain?





Explanation

Acute onset of back pain in a patient over 50 years old, while a 'red flag' that warrants careful consideration for conditions like compression fracture, malignancy, or AAA, does not necessarily require immediate investigation in the absence of other concerning symptoms. However, it is an important demographic factor that increases the index of suspicion for more serious pathology. Fever/chills (infection), progressive neurological deficit (spinal cord compression, cauda equina), unexplained weight loss (malignancy), and history of IV drug use (spinal infection) are all strong indicators for urgent workup.

Question 17

A 68-year-old male with a history of peripheral vascular disease presents with unilateral buttock and posterior thigh pain that is worse with walking and relieved by rest. He denies any low back pain. Physical examination is unremarkable, with normal neurological findings. What is the most important differential diagnosis to consider?





Explanation

The patient's presentation of unilateral buttock and posterior thigh pain, worsening with walking and relieved by rest, with no low back pain or neurological findings on exam, is classic for vascular claudication due to peripheral arterial disease (PAD). This is a critical differential for neurogenic claudication (from spinal stenosis). While lumbar disc herniation or spinal stenosis could cause leg pain, the absence of back pain and presence of a vascular history makes PAD a prime suspect. Sacroiliac joint dysfunction typically causes localized buttock pain. Piriformis syndrome causes buttock pain with possible sciatica, but its claudication pattern is less typical. Differentiation often involves asking about the nature of the pain (cramping vs. numbness/tingling) and presence of peripheral pulses, ankle-brachial index, and potentially vascular ultrasound.

Question 18

A 35-year-old pregnant woman in her third trimester develops acute, severe low back pain radiating to her right buttock and posterior thigh. She denies any trauma or 'red flag' symptoms. Neurological examination is normal. What is the most appropriate initial imaging study, if any, to consider?





Explanation

In pregnant patients with acute back pain and radicular symptoms, conservative management is usually the first line. However, if symptoms are severe and persistent, and especially if there's concern for disc herniation, MRI without gadolinium contrast is the imaging modality of choice. It provides excellent soft tissue detail (discs, nerves) and does not involve ionizing radiation, making it safe for the fetus. Plain radiographs and CT scans involve ionizing radiation and are generally avoided unless absolutely necessary. Bone scans are contraindicated in pregnancy. While many cases resolve with conservative management, severe acute pain may warrant imaging to rule out significant pathology that could impact delivery or require intervention, with MRI being the safest option.

Question 19

Which of the following describes the typical pain pattern associated with sacroiliac joint dysfunction?





Explanation

Sacroiliac joint (SIJ) dysfunction typically presents with pain localized to the buttock, often unilateral, which may refer to the posterior thigh, groin, or even the lower abdomen. It is commonly exacerbated by activities that stress the SI joint, such as prolonged sitting, standing on one leg, climbing stairs, or transitional movements (e.g., getting out of a car). Midline low back pain with posterior leg radiation is more suggestive of disc herniation. Bilateral leg pain with walking relief with sitting is neurogenic claudication from spinal stenosis. Groin/anterior thigh pain with hip rotation suggests hip pathology. Mid-thoracic pain after a fall suggests a vertebral compression fracture.

Question 20

A 25-year-old male presents with persistent low back pain for 6 months, worse in the morning and improving with activity. He also reports fatigue, stiffness, and occasional heel pain (enthesitis). Physical examination reveals limited lumbar flexion and tenderness over the sacroiliac joints. Which serological test would be most helpful in confirming the suspected diagnosis?





Explanation

The patient's age, chronic inflammatory back pain (worse in morning, improves with activity), enthesitis (heel pain), and sacroiliac joint tenderness are classic features of ankylosing spondylitis, a seronegative spondyloarthropathy. HLA-B27 is a genetic marker strongly associated with ankylosing spondylitis (present in ~90% of Caucasians with the disease). Rheumatoid Factor (RF), Anti-nuclear Antibody (ANA), and Anti-CCP antibody are associated with rheumatoid arthritis and other autoimmune conditions, not typically spondyloarthropathies. Uric acid levels are relevant for gout. While HLA-B27 is not diagnostic on its own, it strongly supports the clinical suspicion in this context.

Question 21

A 75-year-old male with a history of recurrent urinary tract infections and recent low back pain develops fever, elevated ESR/CRP, and progressive paraparesis. MRI shows an epidural collection compressing the spinal cord at L1. What is the most appropriate next step in management?





Explanation

This patient presents with a spinal epidural abscess, complicated by fever, elevated inflammatory markers, and progressive neurological deficit (paraparesis), indicating spinal cord compression. This is a medical and surgical emergency. Urgent surgical decompression and debridement, along with intravenous antibiotics, are critical to prevent irreversible neurological damage. Long-term oral antibiotics alone are insufficient for cord compression. Outpatient physical therapy or steroid injections are contraindicated. Observation risks permanent neurological loss.

Question 22

A patient undergoing physical therapy for chronic low back pain reports that their pain is now consistently worse when they sit for more than 15 minutes, but improves significantly when they stand and walk. Which of the following conditions is most consistent with this change in symptoms?





Explanation

Pain that is consistently worse with sitting and improves with standing/walking is highly suggestive of lumbar disc herniation. Sitting increases intradiscal pressure and can exacerbate symptoms of disc prolapse by putting direct pressure on the nerve root. Standing and walking, conversely, can relieve pressure on the nerve root. Lumbar spinal stenosis typically presents with pain worse with standing/walking and relieved by sitting. Sacroiliac joint dysfunction often worsens with prolonged sitting but has different relief mechanisms. Facet arthropathy pain is typically worse with extension. Spondylolisthesis can cause either, depending on the degree of stenosis or instability.

Question 23

In evaluating a patient with persistent low back pain, which finding on physical examination is most indicative of a significant psychological component contributing to their pain experience?





Explanation

Non-anatomical sensory loss (e.g., stocking-glove distribution, sensory loss that crosses dermatomal boundaries, or shifting/unreliable sensory deficits) is a 'Waddell's sign' and strongly suggests a non-organic or psychological component to the patient's pain presentation. While not definitive for malingering, it indicates that the subjective experience of pain is not strictly congruent with neuroanatomical pathology. The other options (localized tenderness, limited range of motion, positive straight leg raise, muscle spasm) can all be legitimate signs of organic pathology, although their interpretation requires clinical correlation.

Question 24

Which type of spondylolisthesis is most commonly associated with a pars interarticularis defect?





Explanation

Isthmic spondylolisthesis (also known as spondylolytic spondylolisthesis) is caused by a defect in the pars interarticularis, often due to a stress fracture. This is the most common type in younger individuals and athletes. Degenerative spondylolisthesis results from facet joint arthritis and disc degeneration, typically occurring in older adults without a pars defect. Traumatic spondylolisthesis is due to acute fracture of other parts of the vertebra. Pathologic spondylolisthesis is due to bone disease (e.g., tumor, infection). Dysplastic spondylolisthesis is congenital, characterized by malformation of the superior sacral or inferior L5 facets.

Question 25

A 30-year-old male presents with acute onset, excruciating low back pain and right leg pain following a motor vehicle accident. He has a foot drop on the right side and diminished sensation in the web space between the first and second toes. His patellar and ankle reflexes are normal. Which nerve root is most likely affected?





Explanation

The patient's symptoms (foot drop, diminished sensation in the web space between the first and second toes) are classic for an L5 radiculopathy. The L5 nerve root innervates muscles responsible for ankle dorsiflexion (tibialis anterior, extensor hallucis longus) and provides sensation to the dorsum of the foot, including the first web space. L5 radiculopathy typically does not affect the patellar (L4) or ankle (S1) reflexes. L4 affects the quadriceps and patellar reflex. S1 affects plantarflexion and the ankle jerk reflex. L3 affects the adductors and knee sensation.

Question 26

When evaluating a patient with suspected lumbar disc herniation, which of the following physical examination maneuvers would be most helpful in confirming nerve root irritation?





Explanation

The femoral nerve stretch test (also known as the prone knee bend test) is specifically designed to stretch the femoral nerve (L2, L3, L4 nerve roots). A positive test, eliciting anterior thigh pain, is indicative of upper lumbar disc herniation or other anterior nerve root compression. Schober's test assesses lumbar flexion, relevant for inflammatory back pain. Patrick's test (FABER) assesses sacroiliac joint or hip pathology. The Stork test assesses pars interarticularis stress fracture. Compression/distraction is less specific for nerve root irritation, though distraction can temporarily relieve pressure.

Question 27

A 58-year-old female presents with persistent low back pain. She has a history of breast cancer treated with mastectomy and chemotherapy 5 years ago. Her pain is deep, aching, and not relieved by rest. On examination, she has localized tenderness over the L3 spinous process. Initial plain radiographs are reported as normal. What is the most appropriate next diagnostic step?





Explanation

Given the patient's history of breast cancer and new-onset, persistent, non-mechanical back pain (constant, not relieved by rest), metastatic disease to the spine is a significant concern, even with normal initial plain radiographs. Breast cancer commonly metastasizes to bone. MRI of the lumbar spine with contrast is the most sensitive and specific imaging modality to detect spinal metastases, even when radiographs are normal, and can identify early epidural involvement. Delaying diagnosis can lead to neurological compromise. NSAIDs and observation are insufficient for a red flag presentation. Psychological evaluation is premature. Epidural steroid injections are therapeutic for radiculopathy, not diagnostic for malignancy. Repeating plain films would likely miss early pathology.

Question 28

What is the most common spinal level for symptomatic lumbar disc herniation?





Explanation

The L4-L5 and L5-S1 spinal levels are the most common sites for symptomatic lumbar disc herniation. This is due to the biomechanical stresses placed on these segments, being the junction between mobile lumbar spine and the relatively fixed sacrum, and bearing significant weight. The L5-S1 level is slightly more common than L4-L5. Herniations at higher lumbar levels (L2-L3, L3-L4) are less frequent. T12-L1 herniations are rare.

Question 29

A 42-year-old male presents with acute, severe low back pain after a fall. He reports feeling a 'pop' in his back. Examination reveals tenderness to palpation directly over the spinous process of L1. He has no neurological deficits. Which imaging modality is most appropriate to rule out a fracture?





Explanation

In the setting of acute back pain following trauma with localized spinous process tenderness, a vertebral fracture is a primary concern. Plain radiographs (AP and lateral views) are the initial imaging modality of choice to screen for fractures and assess vertebral alignment. If radiographs are inconclusive or if a complex fracture is suspected, a CT scan would be the next step for better bony detail. MRI is excellent for soft tissue (disc, spinal cord) but may not be the first choice for acute bony trauma, especially if CT is readily available and the primary concern is bone integrity. Bone scan detects metabolic activity, not ideal for acute fracture visualization. Ultrasound has no role in assessing vertebral fractures.

Question 30

A 62-year-old woman presents with low back pain and bilateral leg pain, worse when walking downhill, and improving when walking uphill or cycling. This pattern is characteristic of which condition?





Explanation

The symptom pattern of pain worsening with walking downhill (which causes slight lumbar extension) and improving with walking uphill or cycling (which causes slight lumbar flexion) is a classic presentation of neurogenic claudication due to lumbar spinal stenosis. Lumbar extension narrows the spinal canal, while flexion widens it, relieving pressure on the neural elements. Lumbar disc herniation symptoms are often worse with sitting. Vascular claudication would be worse with any uphill/downhill walking and relieved purely by rest, not by positional changes. Spinal epidural abscess would present with systemic symptoms and rapid neurological deterioration. Sacroiliac joint dysfunction has a different pain pattern.

Question 31

Which finding on physical examination is most suggestive of an acute lumbar disc herniation with nerve root compression?





Explanation

A positive straight leg raise (SLR) test, eliciting radicular pain (pain radiating below the knee) when the leg is passively raised below 60 degrees, is the most sensitive and specific physical finding for a lumbar disc herniation compressing a lower lumbar nerve root (L5 or S1). Tenderness over the SI joint suggests SIJ dysfunction. Limited lumbar flexion is common in many back pain conditions. Hyper-reflexia suggests an upper motor neuron lesion (myelopathy), not typically a lumbar radiculopathy. Widespread, non-dermatomal sensory loss is indicative of a non-organic component to the pain.

Question 32

A 38-year-old patient with no significant past medical history presents with 3 days of severe low back pain and right leg pain, radiating to the lateral aspect of the foot. He has difficulty standing on his toes on the right. An MRI reveals a large L5-S1 disc herniation. He has no bladder/bowel dysfunction or saddle anesthesia. What is the most appropriate initial management?





Explanation

For most acute, symptomatic lumbar disc herniations without signs of cauda equina syndrome or progressive neurological deficit, conservative management is the initial treatment of choice. This includes NSAIDs, activity modification (avoiding aggravating activities but encouraging continued activity within pain limits), and early mobilization. The majority of disc herniations resolve or significantly improve with conservative care over 6-12 weeks. While an epidural steroid injection might be considered for persistent, severe radicular pain after a trial of oral medications, it is not always the immediate first step. Emergency microdiscectomy is reserved for cauda equina syndrome or severe, progressive neurological deficits refractory to conservative care. Bed rest is generally discouraged beyond 1-2 days. Long-term opioids are avoided due to addiction risk.

Question 33

Which condition is characterized by a forward slippage of one vertebral body over another, most commonly L5 over S1, due to bilateral pars interarticularis defects?





Explanation

Spondylolisthesis refers to the anterior (forward) slippage of one vertebral body relative to the one below it. When caused by bilateral pars interarticularis defects (spondylolysis), it is specifically termed isthmic spondylolisthesis, which most commonly occurs at L5-S1. Spinal stenosis is narrowing of the spinal canal. Spondylosis refers to degenerative changes of the spine. Spondylitis is inflammation of the vertebrae. Scoliosis is a lateral curvature of the spine.

Question 34

A 60-year-old male with a history of diabetes and hypertension presents with gradual onset low back pain and left leg weakness. He denies trauma. On examination, he has tenderness over the L4-L5 intervertebral space, weakness in left quadriceps strength, and a diminished left patellar reflex. Sensory exam reveals decreased sensation over the medial aspect of the left lower leg. What is the most likely diagnosis?





Explanation

The constellation of symptoms: weakness in the quadriceps, diminished patellar reflex, and sensory loss over the medial aspect of the lower leg, is classic for an L4 radiculopathy. This is typically caused by a disc herniation at the L3-L4 level or spinal stenosis affecting the L4 nerve root. L5 radiculopathy affects great toe extension/ankle dorsiflexion and sensation on the dorsum of the foot. S1 radiculopathy affects plantarflexion, the ankle jerk reflex, and sensation on the lateral/plantar foot. Femoral nerve neuropathy would cause similar motor and sensory deficits but would usually be more distal or less associated with back pain, and less likely due to a spinal cause. A spinal cord tumor is a possibility for progressive weakness but the specific dermatomal and myotomal pattern points more directly to radiculopathy.

Question 35

Which finding is considered a 'soft' neurological sign in the context of back pain, requiring careful monitoring but not immediate surgical intervention unless progressive?





Explanation

A progressive worsening of a dermatomal sensory deficit, while a sign of nerve irritation/compression, is considered a 'soft' neurological sign. It warrants careful monitoring and re-evaluation but does not typically necessitate immediate surgical intervention unless it progresses rapidly or is associated with more severe motor or sphincter dysfunction. Foot drop (significant motor weakness), bilateral leg weakness, saddle anesthesia, and new onset urinary retention are all 'hard' neurological signs indicative of severe nerve compression (e.g., cauda equina syndrome or severe radiculopathy/myelopathy) and demand urgent evaluation and potentially immediate surgical intervention.

Question 36

A 22-year-old active duty military recruit develops persistent low back pain that is worse with physical activity and relieved by rest. He denies any neurological symptoms. Plain radiographs are normal. Given his occupation, which condition should be high on the differential diagnosis?





Explanation

In a young, active individual, especially military recruits or athletes involved in activities causing repetitive lumbar hyperextension, spondylolysis (a stress fracture of the pars interarticularis) is a common cause of low back pain. The pain is typically activity-related and relieved by rest. Lumbar disc herniation might present with radicular pain. Spinal epidural abscess would have systemic symptoms and neurological deficits. Degenerative disc disease is less common in this age group. Ankylosing spondylitis would typically have inflammatory pain characteristics (worse with rest, better with activity).

Question 37

Which of the following describes the mechanism of pain in neurogenic claudication?





Explanation

Neurogenic claudication, primarily caused by lumbar spinal stenosis, results from ischemia of the spinal nerve roots within the narrowed spinal canal during activity. When standing or walking, the lumbar spine extends, further narrowing the canal and increasing pressure on the nerve roots, leading to reduced blood flow and pain/paresthesia. Resting or flexing the spine widens the canal, restoring blood flow and relieving symptoms. Vascular claudication involves muscle ischemia. Facet joint inflammation causes mechanical back pain. Sciatic nerve irritation in the buttock is piriformis syndrome. Spinal cord compression leads to myelopathy, which is distinct from claudication.

Question 38

A patient presents with acute onset of severe low back pain after a lifting injury. On examination, he holds his back rigidly and has marked paraspinal muscle spasm. He can ambulate but with difficulty. Neurological examination is normal. What is the most likely immediate diagnosis?





Explanation

Acute onset low back pain after a lifting injury, associated with marked paraspinal muscle spasm and rigid posture, without neurological deficits, is most consistent with an acute lumbar muscle strain or ligamentous injury. This is a common diagnosis and usually responds well to conservative management. Lumbar disc herniation would typically involve radicular symptoms. Spinal epidural abscess and cauda equina syndrome are serious conditions with associated systemic symptoms or severe neurological deficits. Vertebral compression fracture would typically present with more focal tenderness and potentially a history of osteoporosis or significant trauma.

Question 39

Which physical examination test is typically used to assess for sacroiliac joint pain?





Explanation

The FABER (Flexion, Abduction, External Rotation), or Patrick's test, is a commonly used provocative test for the sacroiliac joint and/or hip pathology. Pain in the posterior buttock/SI region suggests SIJ involvement, while pain in the groin suggests hip pathology. The Straight Leg Raise test and Slump test assess for nerve root irritation/sciatica. The Femoral Nerve Stretch test assesses for upper lumbar nerve root irritation. The Hoover test is used to assess for non-organic weakness.

Question 40

A 70-year-old male with chronic low back pain and bilateral leg pain reports that his symptoms are worse when standing or walking, but improve significantly when he sits or leans forward. He often has to stop and rest during walks due to leg discomfort and weakness. His MRI shows degenerative changes but no significant disc herniation. What is the most appropriate next diagnostic step to confirm the cause of his leg symptoms?





Explanation

The patient's symptoms are classic for neurogenic claudication secondary to lumbar spinal stenosis. However, due to his age and the description of leg discomfort, vascular claudication (from peripheral arterial disease) remains a critical differential diagnosis. A vascular ultrasound of the lower extremities, along with ankle-brachial index (ABI) measurements, would be the most appropriate next diagnostic step to rule out or confirm a vascular component to his leg pain. EMG/NCS would confirm nerve damage but wouldn't differentiate vascular from neurogenic claudication. Epidural steroid injections are therapeutic, not primarily diagnostic for the cause of claudication (though a positive response can help confirm a spinal source). Dynamic plain radiographs assess for instability, not the specific cause of claudication. Extension exercises would likely worsen his symptoms if he has spinal stenosis.

Question 41

What is the typical presentation of inflammatory back pain, as seen in ankylosing spondylitis, compared to mechanical back pain?





Explanation

Inflammatory back pain, characteristic of spondyloarthropathies, typically presents with insidious onset, morning stiffness lasting >30 minutes, improvement with exercise, and worsening with rest/immobility. Mechanical back pain, on the other hand, usually has an acute or subacute onset, worsens with activity, improves with rest, and has morning stiffness lasting <30 minutes. Therefore, inflammatory pain improving with exercise and mechanical pain worsening with exercise is a key distinguishing feature. The other options describe contrasting or less typical features.

Question 42

A 48-year-old construction worker presents with low back pain and right leg pain that radiates into the posterior calf. He reports his symptoms are worse when bending forward and lifting, and sometimes when sitting. On examination, his right ankle jerk reflex is diminished. He has normal quadriceps strength and great toe extension strength. Which of the following is the most likely diagnosis?





Explanation

The patient's symptoms, including pain radiating to the posterior calf, and specifically a diminished right ankle jerk reflex, are classic for S1 radiculopathy. The S1 nerve root primarily controls plantarflexion and the ankle jerk reflex. L4 radiculopathy would involve the patellar reflex and quadriceps weakness. L5 radiculopathy affects great toe extension and ankle dorsiflexion, and typically has no reflex changes. Sacroiliac joint dysfunction would not typically affect reflexes. Lumbar spinal stenosis often presents with neurogenic claudication, which has a different pattern of exacerbating and relieving factors.

Question 43

In a patient presenting with back pain and a history of intravenous drug use, which 'red flag' diagnosis should be prioritized for investigation?





Explanation

A history of intravenous drug use significantly increases the risk of hematogenous spread of infection to the spine. Therefore, spinal epidural abscess or discitis (infection of the intervertebral disc and adjacent vertebrae) should be a primary concern and urgently investigated in an IV drug user presenting with back pain, especially if associated with fever, malaise, or neurological deficits. The other conditions are less directly linked to IV drug use and represent more common, often non-infectious, causes of back pain.

Question 44

A 55-year-old male with chronic low back pain undergoes an MRI that reveals multilevel degenerative disc disease and bilateral facet hypertrophy at L4-L5 and L5-S1. He also has mild central canal narrowing but no significant nerve root compression. Pain is worse with extension and rotation. What is the most appropriate initial management for his facet-mediated pain?





Explanation

The clinical picture of chronic low back pain, worsened by extension and rotation, with MRI findings of facet hypertrophy, strongly suggests facet-mediated pain. The initial management should focus on conservative measures, with aggressive core strengthening and flexibility exercises playing a crucial role in stabilizing the spine and reducing stress on the facet joints. While diagnostic facet joint injections followed by radiofrequency ablation are a valid treatment pathway for refractory facet pain, conservative physical therapy is almost always attempted first. Lumbar fusion surgery is a last resort for instability or refractory severe pain. Epidural steroid injections are primarily for radicular pain. Long-term opioid analgesics are generally avoided as first-line or long-term management due to significant risks.

Question 45

Which of the following is a common cause of back pain that typically resolves spontaneously within 4-6 weeks with conservative management?





Explanation

Acute lumbar muscle strain or sprain is the most common cause of low back pain and typically resolves spontaneously within 4-6 weeks with conservative management (rest, NSAIDs, heat/ice, gentle activity). The other conditions listed are serious pathologies that require specific medical or surgical interventions and do not typically resolve spontaneously within this timeframe. Spinal epidural abscess, malignant spinal tumor, and cauda equina syndrome are 'red flag' conditions requiring urgent diagnosis and treatment. Severe spondylolisthesis can lead to chronic pain and potential neurological issues, often requiring more than conservative management to resolve.

Question 46

A 60-year-old patient with a history of diffuse idiopathic skeletal hyperostosis (DISH) presents with acute, severe back pain after a minor fall. Radiographs show a fracture through an ossified anterior longitudinal ligament (ALL). What is a critical consideration in managing this type of fracture?





Explanation

Fractures through a fused, osteophytic segment (such as in DISH or ankylosing spondylitis) are often highly unstable, behaving like long bone fractures. Even minor trauma can cause a three-column injury. These fractures carry a significantly higher risk of neurological injury compared to typical vertebral compression fractures in osteoporotic patients. Therefore, they require careful immobilization, thorough neurological assessment, and often surgical stabilization. MRI is not contraindicated but may be challenging due to severe artifact if metal implants are present, but is crucial for assessing soft tissue (cord, ligaments). Neurological deficits are not rare and must be monitored closely.

Question 47

Which of the following conditions is characterized by pain that is often described as a 'deep ache' in the buttock, radiating down the posterior leg, and exacerbated by prolonged sitting or direct pressure on the buttock, sometimes with a positive straight leg raise test?





Explanation

Piriformis syndrome is characterized by buttock pain (deep ache) that may radiate down the posterior leg, mimicking sciatica, due to compression or irritation of the sciatic nerve by the piriformis muscle. It is typically exacerbated by prolonged sitting, direct pressure on the buttock, or activities that stretch the piriformis muscle. A positive straight leg raise may be present but often not as severe as with true disc herniation. Lumbar disc herniation typically has more specific dermatomal/myotomal patterns. Sacroiliac joint dysfunction is localized more specifically to the SI joint. Proximal hamstring tendinopathy causes pain more directly at the ischial tuberosity. Lumbar spinal stenosis causes neurogenic claudication.

Question 48

A 30-year-old construction worker presents with chronic low back pain and radicular symptoms to his right leg. He has undergone 3 months of physical therapy, NSAIDs, and activity modification without significant relief. MRI shows a contained L4-L5 disc protrusion without significant migration, impinging the L5 nerve root. Neurological exam reveals mild weakness in right great toe extension (4/5) but no bladder/bowel dysfunction. What is the most appropriate next step?





Explanation

Given the failure of 3 months of conservative management for persistent radicular pain due to a disc protrusion and mild, non-progressive motor weakness, a transforaminal epidural steroid injection is a reasonable next step. It can provide significant pain relief by delivering anti-inflammatory medication directly to the affected nerve root. Surgical intervention (microdiscectomy) is typically considered for intractable pain after a trial of epidural injections, or for progressive neurological deficits. Lumbar fusion is overly aggressive for this presentation. Continuing conservative management for another 3 months without any specific escalation may be prolonged, and psychological counseling is not the primary intervention for this specific clinical picture, although it can be part of a multidisciplinary approach for chronic pain.

Question 49

Which of the following is a common cause of back pain in older adults that involves anterior slippage of one vertebral body over another without a pars interarticularis defect?





Explanation

Degenerative spondylolisthesis is the most common form of spondylolisthesis in older adults. It results from chronic disc degeneration and facet joint arthritis, leading to instability and gradual forward slippage of one vertebra over another (most commonly L4 over L5). Unlike isthmic spondylolisthesis, there is no pars interarticularis defect. Dysplastic is congenital, pathologic is due to systemic bone disease, and traumatic is from acute fracture. Isthmic is due to pars defect, typically in younger individuals.

Question 50

A 25-year-old female presents with acute onset, severe low back pain after a fall. She reports difficulty bearing weight and tenderness to percussion over the L3 vertebral body. She has no neurological deficits. What is the most appropriate initial imaging study?





Explanation

In the setting of acute, severe, focal back pain after trauma with tenderness to percussion over a vertebral body, a vertebral fracture is a primary concern. Plain radiographs (AP and lateral views) are the initial imaging of choice to screen for fractures and assess alignment. If radiographs are normal but suspicion remains high, or if further characterization is needed, CT scan would be the next step for superior bony detail. MRI is excellent for soft tissue and cord assessment but less sensitive than CT for acute bony trauma. Bone scan detects stress reactions or metabolic activity, and EMG assesses nerve function.

Question 51

Which of the following is most strongly associated with chronic low back pain (>3 months) that is unresponsive to conventional treatments?





Explanation

Psychosocial factors, such as high levels of pain catastrophizing (exaggerating the threat of pain) and fear-avoidance beliefs (avoiding activity due to fear of pain or re-injury), are strong predictors of chronicity and poor outcomes in low back pain, often more so than specific structural findings on imaging. While structural abnormalities can contribute to pain, their correlation with chronic, intractable pain is often weak. The other options describe common imaging findings or clinical signs that, while potentially related to pain, are not as strongly associated with treatment resistance and chronicity as psychosocial factors.

Question 52

A 50-year-old male with a history of intravenous drug use and recent fever presents with new-onset, severe low back pain that has become progressively worse over 3 days. He now reports leg weakness and numbness. His ESR and CRP are significantly elevated. What is the most urgent diagnostic test?





Explanation

This patient presents with multiple 'red flags' for spinal infection (IV drug use, fever, progressively worsening pain, elevated inflammatory markers, and new neurological deficits). These symptoms are highly suggestive of a spinal epidural abscess or discitis with potential cord compression. MRI of the lumbar spine with contrast is the most urgent diagnostic test. It is the gold standard for visualizing spinal infections, epidural collections, and assessing the degree of spinal cord compression. Plain radiographs and CT scans are less sensitive for early infection and soft tissue involvement. Blood cultures are important for identifying the causative organism but do not provide immediate anatomical information about cord compression. EMG assesses nerve function but is not the most urgent diagnostic for infection/compression.

Question 53

Which of the following is the most sensitive imaging modality for detecting early sacroiliitis in a patient with suspected ankylosing spondylitis?





Explanation

MRI of the sacroiliac joints, particularly with STIR (Short Tau Inversion Recovery) sequences to detect bone marrow edema, is the most sensitive imaging modality for detecting early, active sacroiliitis (inflammation of the SI joints) in conditions like ankylosing spondylitis. Plain radiographs are often normal in the early stages, as they primarily show chronic changes (erosions, sclerosis, fusion). CT provides good bony detail but is less sensitive for early inflammatory changes. Bone scans are sensitive but not specific for sacroiliitis. Ultrasound is generally not used for deep joint imaging like the SI joint.

Question 54

A patient with long-standing back pain reports that his pain is worse when driving for long periods, relieved somewhat by frequent stops and stretching. He denies radicular symptoms. On examination, there is tenderness over the left greater trochanter and pain with resisted hip abduction. Lumbar spine examination is otherwise unremarkable. What is the most likely source of his pain?





Explanation

The localized tenderness over the greater trochanter, pain with resisted hip abduction, and exacerbation with prolonged sitting (which compresses the bursa) are classic signs of trochanteric bursitis. While back pain can be present as a separate issue or referred, the specific findings point strongly to this hip region pathology. Lumbar disc herniation would present with radicular pain. Lumbar spinal stenosis would cause neurogenic claudication. Sacroiliac joint dysfunction would cause pain more medially in the buttock/SI region. Facet joint arthropathy would be worse with extension/rotation. This highlights the importance of considering non-spinal causes of back and hip region pain.

Question 55

Which of the following features is most characteristic of discogenic pain without radiculopathy?





Explanation

Discogenic pain, particularly from internal disc disruption or a contained disc bulge, can cause significant low back pain without specific radicular symptoms. This type of pain is typically exacerbated by activities that increase intradiscal pressure, such as flexion, sitting, and Valsalva maneuvers. It is usually localized to the central lower back and may radiate into the buttocks or thighs, but generally not below the knee in a dermatomal pattern (which would indicate radiculopathy). Pain primarily in the lower extremities or relieved by standing/walking suggests other conditions. Morning stiffness improving with activity suggests inflammatory back pain. Pain localized to the SI joint suggests SIJ dysfunction.

Question 56

A 72-year-old male presents with new onset back pain, generalized fatigue, and recent unexplained fractures. Laboratory tests show hypercalcemia, anemia, and elevated total protein with a monoclonal M-spike. Which condition should be high on the differential diagnosis?





Explanation

The constellation of new-onset back pain, generalized fatigue, unexplained fractures, hypercalcemia, anemia, and a monoclonal M-spike (on serum protein electrophoresis) is highly suggestive of Multiple Myeloma. This plasma cell dyscrasia leads to lytic bone lesions, pain, and can cause pathological fractures. While osteoporosis causes fractures, it doesn't typically present with hypercalcemia, anemia, or an M-spike. Ankylosing spondylitis has inflammatory back pain features. Metastatic prostate cancer typically causes osteoblastic lesions (though can be lytic) and may cause anemia and hypercalcemia, but the M-spike is more specific to myeloma. Renal osteodystrophy is related to kidney disease.

Question 57

Which of the following statements regarding the role of X-rays in the initial evaluation of acute, non-specific low back pain is most accurate?





Explanation

Plain radiographs (X-rays) are generally not recommended for the routine initial evaluation of acute, non-specific low back pain without 'red flag' symptoms, as they have low yield and expose the patient to unnecessary radiation. Their primary utility is when 'red flag' symptoms are present (e.g., trauma, suspicion of fracture, history of cancer, fever, neurological deficits) to screen for bony pathology, instability, or significant deformity. X-rays are poor for soft tissue visualization (discs, nerves) and cannot definitively rule out spinal infection or malignancy, which require advanced imaging like MRI. MRI is the gold standard for cauda equina syndrome.

Question 58

A 35-year-old patient reports chronic pain radiating from the low back into the right buttock and posterior thigh, occasionally reaching the knee. Pain is worse with prolonged sitting and during bowel movements. Physical examination reveals tenderness in the sciatic notch and pain reproduction with passive internal rotation and adduction of the right hip while the hip is flexed. What is the most likely diagnosis?





Explanation

The clinical presentation of chronic buttock and posterior thigh pain, exacerbated by prolonged sitting and bowel movements, tenderness in the sciatic notch, and pain with maneuvers that stretch or contract the piriformis muscle (passive internal rotation, adduction, flexion of the hip, e.g., FAIR test or Freiberg sign), is highly suggestive of piriformis syndrome. This condition involves irritation or compression of the sciatic nerve by the piriformis muscle. While L5-S1 disc herniation can cause similar pain, the specific physical exam findings point more strongly to piriformis syndrome, which is often a diagnosis of exclusion after ruling out true radiculopathy. Sacroiliac joint dysfunction pain is usually more medial. Proximal hamstring tear would cause pain directly at the ischial tuberosity. Facet arthropathy would be more localized to the lumbar spine and worsen with extension/rotation.

Question 59

Which of the following diagnostic procedures involves injecting anesthetic and potentially a corticosteroid into the epidural space, and is used for both diagnosis and treatment of radicular pain?





Explanation

An epidural steroid injection (ESI) involves injecting anesthetic and corticosteroids into the epidural space surrounding the nerve roots. It is widely used to diagnose the source of radicular pain (if a specific nerve root is targeted and provides relief) and to treat the inflammation and pain associated with nerve root compression (e.g., from a disc herniation or spinal stenosis). Medial branch blocks and facet joint injections target the nerves supplying the facet joints, used for facet-mediated pain. Radiofrequency ablation is a neurolytic procedure for long-term pain relief from facet or sacroiliac joint pain. Discography is a provocative test to determine if a specific disc is a pain generator, and it's controversial.

Question 60

A 28-year-old patient presents with back pain and right leg pain. During the straight leg raise test, he suddenly drops his leg when it reaches a certain point and then reports severe pain. He also exhibits inconsistent motor weakness and widespread, non-dermatomal sensory loss. These findings are consistent with:





Explanation

The described findings—sudden leg drop on SLR (hoover sign, usually), inconsistent motor weakness, and non-dermatomal sensory loss—are classic 'Waddell's signs' for non-organic components to back pain. While the patient may have genuine underlying pain, these signs indicate a strong psychological or behavioral overlay to their presentation, rather than purely organic pathology. Malingering is a specific form of non-organic presentation where there is conscious feigning of symptoms for secondary gain. While possible, 'non-organic signs' is a broader and more clinically useful description for this pattern of findings. The other options describe organic pathologies that would present with consistent and anatomically plausible signs.

Question 61

A 65-year-old male presents with low back pain and bilateral leg heaviness. He has difficulty distinguishing between neurogenic and vascular claudication. Which of the following historical features would most strongly suggest neurogenic claudication?





Explanation

Pain that is improved by leaning forward or sitting (the 'shopping cart sign') is a classic distinguishing feature of neurogenic claudication, as these positions typically widen the spinal canal and relieve pressure on the neural elements. Vascular claudication is usually relieved by standing still or resting, not necessarily by positional changes, and is more commonly exacerbated by walking (especially uphill), with pain primarily in the calves. Diminished peripheral pulses and a history of diabetes and smoking are risk factors for vascular claudication. Pain worse with uphill walking is also more suggestive of vascular claudication, as it requires greater muscle exertion.

Question 62

In a patient presenting with back pain, which finding on a lumbar MRI is least likely to be clinically significant if isolated?





Explanation

Mild degenerative disc changes (e.g., disc desiccation, mild disc bulge without significant neural impingement) are extremely common findings on MRI, particularly in individuals over 30-40 years old, and are often asymptomatic. When present as an isolated finding without corresponding clinical symptoms (like radiculopathy or neurogenic claudication), they are least likely to be the primary cause of clinically significant back pain. The other options describe severe pathologies with clear clinical implications: disc extrusion with stenosis, epidural abscess, primary tumor, and spondylolisthesis with radiculopathy all require serious clinical attention and intervention.

Question 63

What is the primary role of a diagnostic selective nerve root block in evaluating back pain?





Explanation

A diagnostic selective nerve root block involves injecting a local anesthetic directly around a specific suspected nerve root. If the patient's radicular pain is significantly and temporarily relieved following the injection, it confirms that the blocked nerve root is indeed the source of their pain. This helps in localizing the pain generator and guiding further treatment (e.g., targeted epidural injections, surgical decompression). It is not a definitive treatment, nor does it confirm the presence of a disc herniation or assess instability or rule out tumor/infection.

Question 64

A 30-year-old male presents with persistent low back pain for 4 months. He has tried NSAIDs, physical therapy, and chiropractic care with minimal improvement. His pain is worse with prolonged sitting and certain twisting movements. Physical exam is normal. MRI shows mild degenerative changes at L5-S1 and a small annular tear. Which of the following might be considered in this scenario to further evaluate the pain source, though it remains controversial?





Explanation

In a patient with chronic discogenic-type back pain (worse with prolonged sitting, twisting), with minimal findings on MRI beyond mild degenerative changes or an annular tear, discography may be considered to assess if a specific disc is the pain generator. This involves injecting contrast into the disc and reproducing the patient's typical pain, usually followed by an anesthetic challenge. However, discography is controversial due to potential for false positives, complications, and acceleration of disc degeneration. Lumbar fusion is premature. EMG is for radiculopathy. Systemic corticosteroids are not indicated for chronic mechanical pain. Repeated MRI with contrast is unlikely to yield new information in this scenario if there's no suspicion for infection or tumor.

Question 65

Which red flag symptom is most suggestive of an abdominal aortic aneurysm (AAA) as a cause of back pain?





Explanation

A pulsatile abdominal mass, especially when combined with sudden onset of severe, tearing back pain (which may radiate to the groin or flank), is highly suggestive of a ruptured or expanding abdominal aortic aneurysm (AAA). This is a life-threatening emergency. Pain with Valsalva is typical of discogenic pain. Unexplained weight loss and fever/chills are red flags for malignancy or infection. Bilateral leg weakness suggests cauda equina syndrome or myelopathy.

Question 66

A 40-year-old patient with no prior medical history presents with 2 weeks of acute low back pain and severe left leg pain radiating to the foot. He has a positive straight leg raise test at 45 degrees, 3/5 strength in left great toe extension, and decreased sensation on the dorsum of the left foot. What is the most likely initial treatment strategy?





Explanation

This patient has acute radiculopathy likely from a lumbar disc herniation, with moderate motor weakness (3/5 strength). While the weakness is significant, it's not a complete motor deficit or cauda equina syndrome. The initial treatment strategy for such cases is typically conservative, including physical therapy (often with a McKenzie approach which focuses on extension exercises to centralize pain), NSAIDs, and activity modification. Most disc herniations improve spontaneously. Urgent microdiscectomy is reserved for cauda equina syndrome or progressive/severe neurological deficits unresponsive to conservative care. Strict bed rest is outdated and generally harmful. Epidural steroid injections may be considered if conservative management fails, but usually not as the immediate first step. Long-term opioids are inappropriate for acute pain management.

Next Chapter Spinal Stability: Protecting Against Neurologic Deficit
Dr. Mohammed Hutaif
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Prof. Dr. Mohammed Hutaif
Consultant Orthopedic & Spine Surgeon
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