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6. Spine MCQs

Practice Set 76 of 379

This practice set contains high-yield board review questions covering key concepts in 6. Spine. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 1501

Topic: 6. Spine

Which of the following scenarios should raise the highest suspicion for a Richter hernia in a patient presenting to an orthopedic clinic?

. A 60-year-old male with chronic groin pain, positive FADIR test, and a history of hip osteoarthritis.
. A 40-year-old female with acute onset of right anterior thigh pain after exercise, and a palpable, tender, firm mass in the femoral triangle.
. A 70-year-old male with lumbar spinal stenosis presenting with bilateral leg claudication.
. A 25-year-old athlete with recurrent hamstring strains and diffuse posterior thigh pain.
. A child with a limp and a painless, soft, reducible inguinal bulge.

Correct Answer & Explanation

. A 40-year-old female with acute onset of right anterior thigh pain after exercise, and a palpable, tender, firm mass in the femoral triangle.

Explanation

Correct Answer: BThe most concerning scenario for an orthopedic surgeon indicating a potential Richter hernia is a patient with acute onset of right anterior thigh pain and a palpable, tender, firm mass in the femoral triangle. This presentation strongly suggests a femoral hernia, a common site for Richter incarceration. The pain radiating to the thigh is characteristic of femoral or obturator hernias due to nerve irritation. The other options describe common orthopedic pathologies (hip OA, spinal stenosis, hamstring strain) or an uncomplicated hernia (child with reducible bulge) that are less likely to be a life-threatening Richter hernia. While chronic groin pain can be due to various causes, an acute, tender, irreducible mass significantly changes the urgency.

Question 1502

Topic: 6. Spine

Which of the following physical examination findings is considered most highly specific for the diagnosis of cervical myelopathy?

. Positive Spurling test
. Asymmetric loss of the biceps reflex
. Bilateral Hoffmann signs
. Positive Lhermitte sign
. Inverted supinator reflex

Correct Answer & Explanation

. Inverted supinator reflex

Explanation

The inverted supinator (brachioradialis) reflex is highly specific for cervical myelopathy at the C5-C6 level. While a Hoffmann sign and Lhermitte sign are classically seen in myelopathy, they are less specific than the inverted supinator reflex.

Question 1503

Topic: 6. Spine

A 65-year-old male presents with deteriorating handwriting, difficulty buttoning his shirt, and gait clumsiness. Physical examination reveals a positive Hoffman's sign and hyperreflexia in both lower extremities. MRI of the cervical spine demonstrates multi-level spondylosis with severe cord compression and T2 signal hyperintensity in the spinal cord. What is the most appropriate management?

. Cervical epidural steroid injection
. Physical therapy and oral NSAIDs
. Cervical decompression and stabilization
. Immobilization in a rigid cervical collar
. Electromyography and nerve conduction studies

Correct Answer & Explanation

. Cervical decompression and stabilization

Explanation

This patient presents with classic signs of cervical spondylotic myelopathy. Given the progressive upper motor neuron signs and MRI evidence of cord compression with signal change, surgical decompression and stabilization are definitively indicated.

Question 1504

Topic: Thoracolumbar Spine & Deformity

Which of the following intrinsic anatomical risk factors is most strongly associated with an increased incidence of non-contact ACL tears in female athletes?

. Decreased posterior tibial slope
. Increased anterior pelvic tilt
. Narrow intercondylar notch width index
. Decreased Q-angle
. Patella baja

Correct Answer & Explanation

. Narrow intercondylar notch width index

Explanation

Intrinsic risk factors for ACL tears, particularly in females, include a narrow intercondylar notch width, increased posterior tibial slope, and generalized ligamentous laxity. A narrow notch can cause mechanical impingement on the ACL.

Question 1505

Topic: Thoracolumbar Spine & Deformity
A 14-year-old competitive gymnast presents with insidious onset low back pain exacerbated by extension and hyperextension activities. Physical examination reveals hamstring tightness and a palpable step-off at L5. AP and lateral radiographs of the lumbar spine show a defect in the pars interarticularis at L5 with an anterior translation of L5 on S1. Which of the following is the most appropriate classification for this condition?
. Type I Dysplastic
. Type II Isthmic, Lytic
. Type III Degenerative
. Type IV Traumatic
. Type V Pathologic

Correct Answer & Explanation

. Type II Isthmic, Lytic

Explanation

The patient's age, activity (gymnast), pars defect, and anterior translation are classic for an isthmic spondylolisthesis. The Wiltse-Newman classification Type II isthmic is characterized by a lesion in the pars interarticularis. Given the insidious onset and high-impact repetitive extension activities, it's most likely a stress fracture (lytic) rather than an acute traumatic fracture (Type IV) or congenital dysplastic anomaly (Type I). Degenerative (Type III) is typically seen in older adults, and pathologic (Type V) is due to bone disease.

Question 1506

Topic: Thoracolumbar Spine & Deformity
Which of the following Meyerding grades of spondylolisthesis indicates a slip of 50-75% of the vertebral body's width?
. Grade I
. Grade II
. Grade III
. Grade IV
. Grade V

Correct Answer & Explanation

. Grade III

Explanation

The Meyerding classification system grades spondylolisthesis based on the percentage of anterior displacement of the superior vertebral body over the inferior one. Grade I is 0-25%, Grade II is 25-50%, Grade III is 50-75%, Grade IV is 75-100%, and Grade V (spondyloptosis) is complete displacement (>100%). Therefore, 50-75% displacement corresponds to Grade III.

Question 1507

Topic: 6. Spine

A 55-year-old female presents with a long history of low back pain and bilateral leg pain, worse with standing and walking, relieved by sitting or leaning forward. Radiographs show L4-L5 degenerative spondylolisthesis (Grade I) with associated spinal stenosis. She has failed 6 months of comprehensive conservative management including physical therapy, NSAIDs, and epidural steroid injections. Neurological exam reveals mild quadriceps weakness (4+/5) bilaterally but no frank motor deficit. What is the most appropriate next step in management?

. Continue conservative management, add opioid analgesics
. L4-L5 posterior decompression alone
. L4-L5 posterior decompression and instrumented posterolateral fusion
. L4-L5 anterior lumbar interbody fusion alone
. L4-L5 transforaminal lumbar interbody fusion (TLIF) without decompression

Correct Answer & Explanation

. L4-L5 posterior decompression and instrumented posterolateral fusion

Explanation

Correct Answer: CFor symptomatic degenerative spondylolisthesis with spinal stenosis that has failed conservative management, surgical intervention is often indicated. The Spine Patient Outcomes Research Trial (SPORT) demonstrated superior outcomes for surgical treatment compared to non-operative care in patients with degenerative spondylolisthesis and stenosis. While decompression alone can address stenosis, studies like SPORT have shown that adding fusion to decompression significantly improves outcomes and reduces reoperation rates for degenerative spondylolisthesis, especially in the presence of instability or significant back pain. Quadriceps weakness suggests L4 nerve root compression, making decompression necessary. Anterior fusion alone does not address the posterior decompression requirement. TLIF typically includes decompression. The best option combining decompression and stabilization is decompression with instrumented posterolateral fusion.

Question 1508

Topic: 6. Spine

A 30-year-old male with chronic L5-S1 isthmic spondylolisthesis (Grade II) complains of persistent low back pain and bilateral S1 radiculopathy despite 9 months of conservative treatment. On examination, he has bilateral hamstring tightness and a positive straight leg raise test at 45 degrees. Which of the following imaging modalities is most crucial for evaluating potential nerve root compression and planning surgical decompression?

. Plain radiographs (AP/Lateral/Oblique)
. CT scan of the lumbar spine
. MRI of the lumbar spine
. Bone scintigraphy
. Electromyography (EMG)

Correct Answer & Explanation

. MRI of the lumbar spine

Explanation

Correct Answer: CWhile plain radiographs define the slip, and CT can better visualize bony stenosis, MRI is superior for evaluating soft tissue structures, including nerve roots, discs, and the spinal cord, and identifying nerve root compression by hypertrophic soft tissue, disc herniation, or foraminal stenosis, which is critical for surgical planning in patients with radiculopathy. EMG assesses nerve function but isn't an imaging modality for structural compression.

Question 1509

Topic: Thoracolumbar Spine & Deformity

Which of the following describes the anatomical defect in Type IIB isthmic spondylolisthesis?

. Elongation of the pars interarticularis without fracture
. Lytic stress fracture of the pars interarticularis
. Acute fracture of the pars interarticularis
. Degeneration of the facet joints
. Congenital dysplastic elements

Correct Answer & Explanation

. Elongation of the pars interarticularis without fracture

Explanation

Correct Answer: AWiltse-Newman Type II isthmic spondylolisthesis is subdivided: Type IIA is a lytic (stress) fracture of the pars, Type IIB is an elongated but intact pars (often a healed stress fracture with elongation), and Type IIC is an acute fracture of the pars. Therefore, Type IIB specifically refers to an elongated pars without a clear lytic defect.

Question 1510

Topic: 6. Spine

What is the most common neurological complication following reduction of a high-grade spondylolisthesis?

. Cauda equina syndrome
. L5 nerve root palsy
. S1 nerve root palsy
. Foot drop (peroneal nerve palsy)
. Femoral nerve palsy

Correct Answer & Explanation

. L5 nerve root palsy

Explanation

Correct Answer: BThe L5 nerve root is most vulnerable during the reduction of a high-grade L5-S1 spondylolisthesis. This is due to its course over the sacral ala and the potential for stretch injury during the reduction maneuver, especially with attempts to correct lumbosacral kyphosis. While other nerve injuries can occur, L5 radiculopathy/palsy is the most frequently reported neurological complication.

Question 1511

Topic: Thoracolumbar Spine & Deformity
What is the typical radiological feature that differentiates degenerative spondylolisthesis from isthmic spondylolisthesis?
. Sacral spina bifida occulta
. Pars interarticularis defect
. Intact pars interarticularis with facet joint degeneration
. Trapezoidal L5 vertebral body
. High-grade slip (>50%)

Correct Answer & Explanation

. Intact pars interarticularis with facet joint degeneration

Explanation

Degenerative spondylolisthesis (Wiltse-Newman Type III) is characterized by an intact pars interarticularis, with anterior slippage resulting from chronic instability due to degenerative changes in the facet joints and intervertebral disc. Isthmic spondylolisthesis (Type II) is defined by a defect in the pars. Type I (Dysplastic) can have a trapezoidal L5 and spina bifida. High-grade slips can occur in both types, though less common in Type III.

Question 1512

Topic: Thoracolumbar Spine & Deformity

A 12-year-old active child presents with an L5-S1 Grade II spondylolisthesis that has shown progression from Grade I over the past 6 months. He has moderate back pain but no neurological deficits. Conservative treatment has been initiated but the slip continues to progress. What is the most appropriate next step in management?

. Continue conservative management indefinitely
. Perform L5-S1 posterolateral fusion in situ
. Attempt aggressive reduction and fusion
. Decompression alone at L5-S1
. Initiate high-dose corticosteroid therapy

Correct Answer & Explanation

. Perform L5-S1 posterolateral fusion in situ

Explanation

Correct Answer: BIn a child with a progressive spondylolisthesis (especially Grade II or higher) despite conservative management, surgical stabilization is indicated to prevent further slip and potential neurological complications. L5-S1 in situ posterolateral fusion is generally preferred for these cases. Aggressive reduction is associated with higher risks of neurological injury, and decompression alone would not address the instability or progression. Corticosteroids are not indicated.

Question 1513

Topic: Thoracolumbar Spine & Deformity

In an adult patient with isthmic spondylolisthesis, which muscle group is characteristically tight and often contributes to sagittal imbalance and altered gait?

. Quadriceps femoris
. Gluteus maximus
. Hamstrings
. Psoas major
. Rectus abdominis

Correct Answer & Explanation

. Hamstrings

Explanation

Correct Answer: CHamstring tightness is a common clinical finding in patients with spondylolisthesis, particularly in children and adolescents, but also in adults. It is thought to be a compensatory mechanism to maintain sagittal balance and prevent further anterior shear forces on the unstable segment, often leading to a 'pelvic tilt' or 'waddling' gait.

Question 1514

Topic: Thoracolumbar Spine & Deformity

What is the primary advantage of a Transforaminal Lumbar Interbody Fusion (TLIF) over a Posterior Lumbar Interbody Fusion (PLIF) for spondylolisthesis correction?

. Allows for wider central canal decompression
. Requires less posterior muscle dissection
. Provides better lordosis restoration
. Offers a lower risk of dural tear and nerve root injury
. Enables multi-level fusion more easily

Correct Answer & Explanation

. Offers a lower risk of dural tear and nerve root injury

Explanation

Correct Answer: DTLIF offers a unilateral approach to the disc space, allowing for disc excision and cage placement through the foramen. This typically involves less retraction of the thecal sac and nerve roots compared to PLIF, which requires bilateral laminectomy and retraction, thereby generally carrying a lower risk of dural tear and nerve root injury. While both can restore lordosis and achieve fusion, the safety profile regarding dural injury is a key advantage of TLIF.

Question 1515

Topic: 6. Spine

A 6-year-old male presents with a progressive spinal deformity. An AP radiograph, similar to the one shown, reveals a left-sided lumbar scoliosis with a fully segmented hemivertebra at L2 and a contralateral unsegmented bar from L1 to L3. The Cobb angle measures 35 degrees. Based on the natural history of congenital scoliosis, what is the most likely prognosis for this patient's curve progression?

. A. The curve is likely to stabilize or resolve spontaneously due to the patient's young age.
. B. The curve will likely progress slowly, approximately 1 degree per year, after skeletal maturity.
. C. The curve has a benign prognosis and is unlikely to progress beyond 20 degrees.
. D. The curve has the least balanced growth potential and the worst prognosis for progression.
. E. The curve will likely respond well to bracing and prevent the need for surgical intervention.

Correct Answer & Explanation

. D. The curve has the least balanced growth potential and the worst prognosis for progression.

Explanation

Correct Answer: DExplanation:The case describes a fully segmented hemivertebra in connection with a contralateral unsegmented bar. According to the provided text, this specific combination of congenital vertebral anomalies has theleast balanced growth potential and the worst prognosisfor progression. This is because a fully segmented hemivertebra has growth plates cranial and caudal to it, allowing for significant growth, while the contralateral unsegmented bar acts as a tether, preventing growth on the concave side. This imbalance leads to severe and progressive deformity.A. The curve is likely to stabilize or resolve spontaneously due to the patient's young age.This is incorrect. While some infantile idiopathic scoliosis curves may resolve, congenital scoliosis, especially with significant vertebral anomalies like a fully segmented hemivertebra and unsegmented bar, rarely resolves spontaneously and typically progresses.B. The curve will likely progress slowly, approximately 1 degree per year, after skeletal maturity.This rate of progression (1 degree per year) is typically associated with adolescent idiopathic scoliosis after skeletal maturity. Congenital scoliosis with severe anomalies can progress much more rapidly, especially during growth spurts, and its progression is not solely tied to post-maturity rates of idiopathic curves.C. The curve has a benign prognosis and is unlikely to progress beyond 20 degrees.This is incorrect. A benign prognosis, rarely progressing beyond 20 degrees, is characteristic of a block vertebra, not a fully segmented hemivertebra with a contralateral unsegmented bar.E. The curve will likely respond well to bracing and prevent the need for surgical intervention.Bracing is generally less effective for congenital scoliosis, particularly those caused by significant bony anomalies like hemivertebrae and unsegmented bars, because the deformity is structural and driven by differential bone growth. Surgical intervention is often required for progressive congenital curves with severe anomalies.

Question 1516

Topic: 6. Spine

A 10-year-old patient with Duchenne muscular dystrophy develops a progressive scoliosis, similar to the pattern of a collapsing long 'C' shaped curve. The patient has recently lost ambulatory function. The orthopedic team is considering surgical intervention. What is the primary goal of surgical treatment for neuromuscular scoliosis in this patient?

. A. Complete correction of the spinal deformity to achieve a Cobb angle less than 10 degrees.
. B. Prevention of future progression to avoid the need for nocturnal ventilation.
. C. Improvement of quality of life, maintenance of function, and sitting balance.
. D. Excision of any underlying vertebral anomalies contributing to the curve.
. E. Restoration of ambulatory function and independent mobility.

Correct Answer & Explanation

. C. Improvement of quality of life, maintenance of function, and sitting balance.

Explanation

Correct Answer: CExplanation:The text explicitly states that the goals of treatment in neuromuscular scoliosis are improved quality of life, maintenance of function, maintenance of respiratory function, and sitting balance. These patients often have significant comorbidities and limited functional potential, so the goals are focused on improving their daily living and preventing further deterioration rather than achieving a 'normal' spine.A. Complete correction of the spinal deformity to achieve a Cobb angle less than 10 degrees.While correction is a goal, 'complete correction' to less than 10 degrees is often unrealistic and not the primary or sole goal in neuromuscular scoliosis, where functional outcomes are prioritized over radiographic perfection.B. Prevention of future progression to avoid the need for nocturnal ventilation.While maintaining respiratory function is a goal, and surgery can delay deterioration, it does not necessarily 'avoid' the need for nocturnal ventilation, especially in a progressive disease like Duchenne muscular dystrophy. The text mentions surgery having an 'additive effect with nocturnal ventilation in delaying the deterioration of respiratory function.'D. Excision of any underlying vertebral anomalies contributing to the curve.This is a treatment strategy for congenital scoliosis (e.g., hemivertebra excision), not typically for neuromuscular scoliosis, which is caused by muscle weakness and lack of spinal support, not vertebral malformations.E. Restoration of ambulatory function and independent mobility.In Duchenne muscular dystrophy, scoliosis often develops after the loss of ambulatory function. Surgery aims to improve sitting balance and overall function, but it does not restore lost ambulatory function.

Question 1517

Topic: 6. Spine

An 8-year-old boy presents with a left-sided thoracic scoliosis and severe back pain. Physical examination reveals abnormal abdominal reflexes and a hairy patch over his lower back. An AP radiograph, similar to the one shown, confirms the scoliosis. Which of the following investigations is most strongly indicated given these atypical findings?

. A. Full-length standing lateral X-ray to assess sagittal balance.
. B. Risser sign assessment to determine skeletal maturity.
. C. Surface topography to objectively assess curve progression.
. D. MRI scanning of the spine to detect underlying intraspinal anomalies.
. E. Electromyography (EMG) to evaluate muscle function.

Correct Answer & Explanation

. D. MRI scanning of the spine to detect underlying intraspinal anomalies.

Explanation

Correct Answer: DExplanation:The case describes several 'atypical features' for scoliosis: a left-sided thoracic curve (most common is right thoracic), severe back pain (scoliosis is not typically painful, severe pain indicates underlying cause), abnormal abdominal reflexes (most commonly associated with intraspinal anomalies), and a hairy patch on the back (a feature of spinal dysraphism). The text explicitly states that MRI scanning of the spine can be used to detect underlying intraspinal anomalies such as diastomatomyelia, syringomyelia, and Arnold–Chiari malformations, particularly in atypical curves.A. Full-length standing lateral X-ray to assess sagittal balance.While a lateral X-ray is part of a standard scoliosis workup, it would not directly identify intraspinal anomalies suggested by the atypical findings.B. Risser sign assessment to determine skeletal maturity.Risser sign is important for predicting progression in idiopathic scoliosis but does not address the underlying pathology suggested by the atypical features.C. Surface topography to objectively assess curve progression.Surface topography is used for follow-up and objective assessment of curves but does not diagnose intraspinal anomalies.E. Electromyography (EMG) to evaluate muscle function.EMG might be considered if a neuromuscular cause was suspected, but the specific combination of atypical curve direction, pain, abnormal reflexes, and skin changes points more directly to structural intraspinal anomalies, making MRI the priority.

Question 1518

Topic: 6. Spine

An orthopedic surgeon is performing a hemivertebra excision in the lumbar spine using a thoraco-abdominal (Hodgson's) approach, as described in the case. After incising the skin, fat, serratus anterior, external oblique, and latissimus dorsi, and removing the 10th rib subperiosteally, the parietal pleura is incised. What is the next critical step in gaining access to the retroperitoneum for this specific approach?

. A. Ligation of segmental vessels.
. B. Division of the diaphragm 2 cm from its origin.
. C. Excision of the discs above and below the hemivertebra.
. D. Splitting the costal cartilage to enter the retroperitoneum.
. E. Sweeping away retroperitoneal fascia with swabs.

Correct Answer & Explanation

. D. Splitting the costal cartilage to enter the retroperitoneum.

Explanation

Correct Answer: DExplanation:The case provides a detailed description of the thoraco-abdominal (Hodgson's) approach. After the initial steps of skin incision, muscle division, rib removal, and parietal pleura incision, the text explicitly states: 'A key step in this procedure is splitting the costal cartilage to enter the retroperitoneum.' This is the direct next step mentioned to transition from the thoracic cavity (after incising pleura) to the retroperitoneal space where the lumbar vertebrae are accessed.A. Ligation of segmental vessels.Ligation of segmental vessels occurs later in the procedure, after the retroperitoneum is entered and the diaphragm is divided, to allow for safe vertebral body work.B. Division of the diaphragm 2 cm from its origin.This step occurs after entering the retroperitoneum and sweeping away fascia, to expose the vertebral column more fully.C. Excision of the discs above and below the hemivertebra.This is a step performed once the vertebral body is exposed, prior to the hemivertebra excision itself.E. Sweeping away retroperitoneal fascia with swabs.This occurs immediately after entering the retroperitoneum, but the entry itself is achieved by splitting the costal cartilage.

Question 1519

Topic: 6. Spine

A 14-year-old female presents with a 30-degree thoracolumbar idiopathic scoliosis. She is post-menarchal with a Risser sign of 3. The curve has shown 5 degrees of progression over the last 6 months. The patient and her parents are concerned about the deformity. Based on the provided guidelines, what is the most appropriate initial management strategy?

. A. Immediate surgical correction with posterior spinal fusion.
. B. Observation with serial radiographs every 12 months.
. C. Initiation of bracing, worn 23 hours a day.
. D. Anterior spinal fusion due to the thoracolumbar curve location.
. E. Referral for physical therapy and exercise program only.

Correct Answer & Explanation

. C. Initiation of bracing, worn 23 hours a day.

Explanation

Correct Answer: CExplanation:The text states that bracing is 'Applied for progressive curves measuring 25–40. Not thought of as corrective but aims to prevent progression of the curve whilst growth continues aiming to reduce the need for surgery.' This patient has a 30-degree curve, which falls within the 25-40 degree range, and has shown progression. Although she is post-menarchal, a Risser 3 indicates some remaining growth potential, making bracing a suitable option to prevent further progression.A. Immediate surgical correction with posterior spinal fusion.Surgery is generally reserved for curves with a magnitude > 50 degrees or earlier intervention in curves with greater potential for progression. A 30-degree curve, even with some progression, is typically managed with bracing first, especially with some remaining growth.B. Observation with serial radiographs every 12 months.Given the documented progression and the curve magnitude (30 degrees), simple observation is insufficient. More frequent monitoring and intervention (like bracing) are indicated.D. Anterior spinal fusion due to the thoracolumbar curve location.While the text mentions considering an anterior approach for thoracolumbar curves, surgery itself is not the initial management for a 30-degree progressive curve in this age group with remaining growth potential.E. Referral for physical therapy and exercise program only.Physical therapy alone is not considered an effective treatment for preventing progression of structural scoliosis of this magnitude.

Question 1520

Topic: Thoracolumbar Spine & Deformity

A 7-year-old patient presents with a 55-degree idiopathic scoliosis. The patient's parents report that the curve was first noticed when the child was 5 years old. The orthopedic surgeon is particularly concerned about the potential for cardiorespiratory compromise. What classification of scoliosis best describes this patient's condition, highlighting the surgeon's primary concern?

. A. Adolescent Idiopathic Scoliosis (AIS).
. B. Juvenile Idiopathic Scoliosis (JIS).
. C. Infantile Idiopathic Scoliosis (IIS).
. D. Early-Onset Scoliosis (EOS).
. E. Late-Onset Scoliosis (LOS).

Correct Answer & Explanation

. D. Early-Onset Scoliosis (EOS).

Explanation

Correct Answer: DExplanation:The text defines 'Early-onset scoliosis' as having its onset before the age of 7 (or 5 by some classifications). It specifically highlights that EOS is 'associated with a high risk of cardiorespiratory compromise as the developing heart and lungs may be affected.' This patient's curve was noticed at age 5, placing it squarely in the early-onset category, and the surgeon's concern directly aligns with the key risk factor for EOS.A. Adolescent Idiopathic Scoliosis (AIS).AIS has its onset after age 10 to maturity. This patient's onset was at age 5, so it does not fit AIS.B. Juvenile Idiopathic Scoliosis (JIS).JIS has its onset between 3 and 10 years. While the onset at age 5 falls within this range, the term 'Early-Onset Scoliosis' is a broader classification specifically used to group all idiopathic scoliosis cases with onset before age 7 (or 5) due to the shared risk of cardiorespiratory compromise, which is the primary concern in the question.C. Infantile Idiopathic Scoliosis (IIS).IIS has its onset between 0 and 3 years. This patient's onset at age 5 is outside this range.E. Late-Onset Scoliosis (LOS).LOS has its onset after the age of 7. This patient's onset was at age 5, so it is not late-onset.

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