Question 1

When performing anterior cruciate ligament reconstruction using a bone- patellar tendon-bone autograft fixated with interference screws, up to how many degrees of divergence between the bone plug and the screw provides mechanically acceptable initial fixation strength on the femoral side?

Explanation

Biomechanical studies have shown that up to 30° of divergence between the femoral bone plug and interference screw can be accepted without significantly compromising initial fixation strength.

Question 2

A 20-year-old male collegiate basketball player experiences a near syncopal episode during a particularly rigorous conditioning session. Appropriate management should include:

Explanation

A near syncopal episode in a young athlete may be a sign of an underlying life threatening condition. Most commonly, this is related to cardiac pathology, such as hypertrophic cardiomyopathy, idiopathic hypertrophic subaortic stenosis, or arrhythmias. These conditions require urgent medical attention as they are frequently life threatening. The athlete should not be allowed to participate until a complete medical (including cardiac) work up has been performed.

Question 3

On a cellular level, the nutritional supplement creatine has the following effect:

Explanation

Creatine is a popular nutritional supplement with athletes, and has a cellular effect of increasing water retention. This effect decreases the amount of free water available to the athlete and may result in cramping and dehydration. In season use of creatine is not recommended.

Question 4

A 20-year-old male weight-lifter complains of progressive right shoulder pain when performing bench presses. He recalls no specific injury, and physical examination reveals mild swelling and tenderness in the right acromioclavicular joint. He is otherwise healthy with no other findings or complaints. The most likely diagnosis is:

Explanation

Distal clavicular osteolysis most commonly occurs in weight-lifters and is most symptomatic while performing bench presses. There is usually no history of trauma. Symptoms may be bilateral in up to 40% of patients. Treatment initially involves modification of training regimens and anti-inflammatory medications. Failing nonoperative interventions, distal clavicle excision is usually successful in alleviating symptoms.

Question 5

When comparing open distal clavicle resection with arthroscopic distal clavicle resection for osteolysis of the distal clavicle, arthroscopic techniques:

Explanation

A study comparing arthroscopic and open techniques of distal clavicular resection in the treatment of osteolysis of the distal clavicle found no difference in the amount of bone resected or amount of pain relief obtained. The arthroscopic group had a shorter hospital stay, less complications, and returned to activity nearly twice as fast as the open group.

Question 6

Osteochondritis dissecans of the elbow most commonly occurs at this location:

Explanation

Osteochondritis dissecans of the elbow is most common in adolescent and pre-adolescent individuals who participate in sports that place an excessive amount of load on the radiocapitellar joint (e.g., baseball pitching, gymnastics). Factors involved in the development of this entity include repetitive microtrauma and a tenuous capitellar blood supply. Treatment may involve arthroscopic removal of loose bodies.

Question 7

When examining an individual for suspected posterior instability of the glenohumeral joint, a posteriorly directed force is applied with the arm in this position:

Explanation

The appropriate position for testing posterior stability of the glenohumeral joint is 90° of forward flexion and internal rotation.

Question 8

Patellar tendinitis is associated with:

Explanation

Activities such as basketball, soccer, volleyball and track require repeated impact with the ground. This leads to micro-trauma, resulting in degeneration of the tendon and focal inflammation. Pain at the inferior pole of the patella is usually isolated with palpation along the tip of the kneecap.

Question 9

Patellar tendinitis:

Explanation

The deep fibers of the patellar tendon are less elastic and more susceptible to stresses that create the micro-traumatic damage. This repetitive stress leads to the focal degeneration and chronic inflammation.C orrect Answer: Leads to fibrinoid necrosis and mucinous degeneration in the deep fibers of the tendon origin at the inferior pole of the patella.

Question 10

Septic arthritis of the knee within 4 weeks following anterior cruciate ligament (AC L) reconstruction using bone-patellar tendonbone autograft should initially be treated with:

Explanation

In a recent study that surveyed surgeons with expertise in AC L reconstruction surgery, 85% of surgeons selected culture-specific intravenous antibiotics and surgical irrigation of the joint with graft retention as initial treatment for the infected patellar tendon autograft. Sixty-four percent of surgeons chose this regimen as treatment for the infected allograft.

Question 11

In the setting of chronic anterior cruciate ligament (AC L) deficiency, which of the following meniscal tear patterns is most common:

Explanation

Medial meniscal tears account for approximately 45% of acute tears and 70% of chronic tears in patients with AC L insufficiency. Peripheral posterior horn tears of the medial meniscus are the most common type of tear associated with chronic AC L deficiency.

Question 12

All of the following are reported complications following the surgical treatment of medial epicondylitis except:

Explanation

The potential complications associated with the surgical treatment of medial tendon injuries primarily involve the structures surrounding the medial epicondyle. The most frequent complications involve the ulnar nerve. Careful dissection through the subcutaneous tissues must be performed so that the medial antebrachial cutaneous nerve can be isolated and protected. Extensive release of the flexor-pronator mass can lead to permanent flexor weakness, as well as detachment of the UC L from the medial epicondyle. The PIN is located on the lateral side of the elbow and its injury is not a reported complication associated with medial epicondylar debridement.

Question 13

In valgus extension overload of the elbow, impingement occurs between which of the following structures:

Explanation

Valgus extension overload is unique to the throwerâ s elbow. Valgus extension overload of the elbow involves attenuation and creep in the ulnar collateral ligament that transfers compressive forces to the lateral compartment of the elbow at the radiocapitellar joint. In the posterior elbow compartment, the valgus moment creates contact between the posteromedial aspect of the olecranon process and the posteromedial olecranon fossa.

Question 14

Anteroposterior displacement of the acromion on the clavicle is most strongly resisted by which of the following structures:

Explanation

During high loads, the coracoclavicular ligaments (conoid and trapezoid ligament) resist vertical and compressive loads across the acromioclavicular joint. The conoid ligament is the strongest ligament resisting downward movement of the scapula relative to the clavicle. The acromioclavicular ligaments maintain alignment of the joint in the axial plane.

Question 15

Causes of distal clavicular osteolysis include all of the following except:

Explanation

Osteolysis of the distal clavicle has been associated with various conditions. Among the most common causes is repetitive microtrauma from activities such as weight lifting, gymnastics, and swimming. Other causes include rheumatoid arthrosis and hyperparathyroidism. The diagnosis of sarcoidosis should be considered in bilateral cases. Diabetes mellitus has not been associated with this condition.

Question 16

Which of the following describes the correct relationship between the suprascapular nerve and the suprascapular vessels as they pass through the suprascapular notch:

Explanation

The suprascapular nerve is a branch of the upper trunk of the brachial plexus at Erbs point. The suprascapular nerve receives branches primarily from the fifth cervical nerve root. The nerve follows the omohyoid muscle laterally and passes beneath the anterior border of the trapezius muscle to the upper border of the scapula where it joins the suprascapular artery. It passes through the suprascapular notch deep to the transverse scapular ligament. The artery and vein pass superficial to the ligament and join the nerve distally in the suprascapular fossa. After innervating the supraspinatus muscle, the nerve passes around the lateral free margin of the scapular spine (spinoglenoid notch) to innervate the infraspinatus muscle.

Question 17

All of the following factors have been used to explain why exertional compartment syndrome is more common in the lower leg when compared to the upper arm except:

Explanation

There are several reasons that have been offered as to why upper arm compartment syndromes are so rare. First, the brachialis fascia is less taut and contains less rigid ligaments than the fascia in the lower leg. Second, the brachialis fascia yields more to increased intracompartmental pressure as compared to the fascia of the lower leg. Third, the muscle compartments of the upper arm blend anatomically with the shoulder girdle making it less likely that bleeding would be confined enough to develop into a compartment syndrome. Finally, muscle stresses that occur in the lower leg during events such as prolonged march seldom occur in the arm.

Question 18

During arthroscopic repair of the lateral meniscus using an "outside-in technique," the most important way to prevent damage to the peroneal nerve is to:

Explanation

The most important consideration in arthroscopic repair of the lateral meniscus is to avoid injuring the peroneal nerve. This is done best by using an outside-in technique and flexing the knee to 90° while passing the needles. With flexion of the knee, the peroneal nerve falls posterior to the joint line. It is important to remember to keep the needles anterior to the biceps.

Question 19

A 20-year old female collegiate swimmer has suffered from pain in her right shoulder and inability to compete for the last 9 months. She has been diagnosed with multidirectional instability. Physical therapy for 7 months has failed, and she wishes to swim competitively again. Assuming the diagnosis is correct, the next step should be:

Explanation

Initial treatment of multidirectional instability is with rehabilitation. These patients, who have loose capsules, often rely on dynamic stabilizing mechanisms rather than tight ligamentous constraint. If surgery is to be performed, the procedure of choice is the inferior capsular shift, originally described by Neer. It reduces the volume of the glenohumeral joint inferiorly, anteriorly, and posteriorly by equalizing capsular tightness on all three sides.

Question 20

How is an anterior drawer test performed to evaluate the competence of the anterior talofibular ligament in a patient with a possible ankle sprain:

Explanation

The anterior drawer test should be performed with the patient sitting, the knee bent, and the ankle plantar flexed in a position of comfort. Flexing the knee relaxes the gastrocnemius. Plantar flexion relaxes the peroneals. The tibia is braced with one hand and the hindfoot is gently brought forward. The amount of anterior translation is compared between feet.

Question 21

Which of the following describes the most accurate femoral attachment site of the medial patellofemoral ligament (MPFL) in relation to the medial epicondyle and adductor tubercle?

Explanation

The femoral footprint of the MPFL is located in a saddle-like sulcus posterior and proximal to the medial epicondyle, and distal and anterior to the adductor tubercle.

Question 22

A 35-year-old male sustains an acute Achilles tendon rupture. In comparing operative versus nonoperative management with early functional rehabilitation, current literature demonstrates:

Explanation

Recent studies comparing operative vs. nonoperative management with early functional rehab show no significant difference in re-rupture rates. However, operative management has higher rates of soft-tissue complications.

Question 23

In posterior cruciate ligament (PCL) reconstruction, the tibial inlay technique was developed primarily to avoid which of the following complications associated with the transtibial technique?

Explanation

The tibial inlay technique avoids the acute angle (the "killer turn") that the graft makes as it exits the posterior tibial tunnel in a transtibial reconstruction. This reduces graft abrasion and attenuation.

Question 24

A medial meniscus posterior root tear alters knee biomechanics by causing which of the following?

Explanation

A posterior root tear disrupts the ability of the meniscus to convert axial loads into hoop stresses. Biomechanically, this results in peak contact pressures equivalent to a total meniscectomy.

Question 25

Which of the following is the primary stabilizing mechanism of the Latarjet procedure in treating anterior shoulder instability?

Explanation

The Latarjet procedure provides stability primarily via the "sling effect" of the conjoined tendon across the inferior subscapularis when the arm is abducted and externally rotated. This accounts for 50-70% of the stabilizing effect.

Question 26

The "peel-back" mechanism, causing Type II SLAP lesions in overhead-throwing athletes, is primarily driven by which shoulder motion during the late cocking phase?

Explanation

In the late cocking phase of throwing, the shoulder is in maximal abduction and external rotation. This position places a torsional force on the biceps anchor, leading to the "peel-back" mechanism of SLAP tears.

Question 27

During the proliferative phase of rotator cuff tendon healing after repair, which collagen type initially predominates before tissue remodeling occurs?

Explanation

Tendon healing involves a proliferative phase characterized by the rapid deposition of Type III collagen. During the subsequent remodeling phase, this is gradually replaced by stronger, highly organized Type I collagen.

Question 28

When evaluating the biomechanical constructs for Ulnar Collateral Ligament (UCL) reconstruction of the elbow, the "docking" technique compared to the traditional figure-of-eight technique has been shown to:

Explanation

The docking technique simplifies humeral fixation by using a single main tunnel in the medial epicondyle where the graft ends are "docked" and tied over a bone bridge, thereby reducing stress risers.

Question 29

A 24-year-old hockey player presents with groin pain exacerbated by flexion and internal rotation. Radiographs demonstrate an elevated alpha angle on the frog-leg lateral view. What is the primary pathomechanical consequence of this structural abnormality?

Explanation

An elevated alpha angle indicates a Cam-type deformity, which is an aspherical femoral head-neck junction. This creates shear forces during flexion and internal rotation, typically causing anterosuperior acetabular chondral delamination.

Question 30

The Female Athlete Triad consists of low energy availability, menstrual dysfunction, and low bone mineral density. What is the primary hormonal mechanism mediating the low bone mineral density in these patients?

Explanation

Low energy availability suppresses the hypothalamic-pituitary-ovarian axis, leading to hypothalamic amenorrhea. The resulting hypoestrogenism causes increased osteoclastic activity and decreased bone density.

Question 31

A 22-year-old distance runner presents with bilateral exercise-induced leg pain. Which of the following intracompartmental pressure measurements is diagnostic for chronic exertional compartment syndrome (CECS)?

Explanation

Diagnostic criteria for CECS (Pedowitz criteria) include one or more of the following: pre-exercise pressure >= 15 mmHg, 1-minute post-exercise pressure >= 30 mmHg, or 5-minute post-exercise pressure >= 20 mmHg.

Question 32

A 25-year-old athlete undergoes Matrix-Induced Autologous Chondrocyte Implantation (MACI) for a 3 cm2 focal chondral defect on the medial femoral condyle. What is the primary histologic composition of the target repaired tissue?

Explanation

Unlike microfracture which predominantly produces fibrocartilage (Type I collagen), MACI aims to produce hyaline-like cartilage, which is rich in Type II collagen and aggrecan, providing superior wear characteristics.

Question 33

A 28-year-old weightlifter presents with a spontaneous distal biceps tendon rupture. He admits to the chronic use of anabolic-androgenic steroids. How do these substances predispose athletes to tendon ruptures?

Explanation

Anabolic steroids lead to rapid muscle hypertrophy and force generation that outpaces the slower structural adaptation of tendons. They also alter collagen fibril architecture, making tendons stiffer and more prone to mechanical failure.

Question 34

A 30-year-old male sustains a multiligament knee injury. An Ankle-Brachial Index (ABI) is measured at 0.8. What is the most appropriate next step in management?

Explanation

An ABI less than 0.9 after a knee dislocation is highly suspicious for a popliteal artery injury. A CT angiogram is indicated as the next step to definitively diagnose the exact location and extent of vascular injury.

Question 35

In a professional jumper suffering from chronic refractory patellar tendinopathy, eccentric decline squat protocols are prescribed. Which of the following best describes the mechanical rationale for this therapy?

Explanation

Eccentric loading protocols subject the tendon to high mechanical tension, which stimulates tenocytes to upregulate collagen synthesis and reorganize collagen alignment, aiding structural remodeling of the tendinopathic tissue.

Question 36

During surgical stabilization of a high ankle sprain (syndesmotic injury) in an athlete, what is the biomechanical advantage of using a suture-button construct over traditional static screw fixation?

Explanation

Suture-button constructs provide dynamic stabilization, allowing normal physiologic external rotation and superior translation of the fibula during ankle dorsiflexion. They also typically eliminate the need for routine hardware removal.

Question 37

A 19-year-old collegiate quarterback sustains a scaphoid waist fracture. Which blood vessel provides the primary retrograde vascular supply to the proximal pole of the scaphoid, predisposing it to avascular necrosis?

Explanation

The scaphoid receives 70-80% of its blood supply via the dorsal carpal branch of the radial artery, which enters the scaphoid at the dorsal ridge and supplies the proximal pole in a retrograde fashion.

Question 38

The primary restraint to lateral patellar translation at 0 to 30 degrees of knee flexion is the:

Explanation

The medial patellofemoral ligament (MPFL) provides approximately 50-60% of the restraint to lateral patellar translation in early flexion. Beyond 30 degrees, the patella engages the trochlear groove, and bony stability becomes the primary restraint.

Question 39

Which of the following statements is true regarding Platelet-Rich Plasma (PRP) preparations for orthopedic conditions?

Explanation

Leukocyte-rich PRP (LR-PRP) contains neutrophils that release matrix metalloproteinases (MMPs) and pro-inflammatory cytokines, which can degrade cartilage. Therefore, leukocyte-poor PRP (LP-PRP) is generally preferred for intra-articular injections like knee osteoarthritis.

Question 40

In a throwing athlete, the primary restraint to valgus stress at the elbow during the late cocking and early acceleration phases of throwing is the:

Explanation

The anterior bundle of the ulnar collateral ligament (UCL) is the primary restraint to valgus stress at the elbow between 30 and 120 degrees of flexion. This corresponds to the extreme valgus loads seen during the late cocking and early acceleration phases of throwing.

Question 41

The "Female Athlete Triad" is characterized by the interrelatedness of low energy availability, menstrual dysfunction, and low bone mineral density. The primary physiological driver of bone loss in this syndrome is:

Explanation

Low energy availability suppresses the hypothalamic release of GnRH, leading to decreased LH/FSH and subsequent hypoestrogenism. This lack of estrogen accelerates bone resorption and halts bone formation, leading to low bone mineral density.

Question 42

Second impact syndrome in athletes is a rare but catastrophic complication occurring when a player sustains a second head injury before symptoms from an initial concussion have resolved. The rapid neurological decline is primarily due to:

Explanation

Second impact syndrome results from a failure of cerebral vascular autoregulation. This causes catastrophic engorgement of the cerebral vasculature, leading to rapid brain swelling, elevated intracranial pressure, and potential herniation.

Question 43

A 24-year-old professional baseball pitcher presents with vague shoulder pain. Physical examination reveals 25 degrees of internal rotation loss and 5 degrees of external rotation gain compared to the non-throwing shoulder. Which of the following anatomic adaptations is most likely responsible for this Glenohumeral Internal Rotation Deficit (GIRD)?

Explanation

Pathologic GIRD is primarily caused by contracture and thickening of the posterior band of the inferior glenohumeral ligament (IGHL) and posterior capsule. This contracture shifts the glenohumeral contact point posterosuperiorly during the throwing motion.

Question 44

During anterior cruciate ligament (ACL) reconstruction using a hamstring autograft, tensioning and fixing the graft at full extension rather than 20-30 degrees of flexion is most likely to result in:

Explanation

Depending on specific tunnel placement, tensioning the ACL graft in full extension can capture the joint, making the graft excessively tight as the knee flexes. This leads to over-constraint and a loss of terminal knee flexion.

Question 45

The most common anatomic location for Osteochondritis Dissecans (OCD) lesions in the knee is the:

Explanation

Approximately 70-80% of knee OCD lesions occur on the lateral aspect of the medial femoral condyle. This area corresponds to the classic location evaluated during the Wilson test.

Question 46

Concurrent anterior cruciate ligament (ACL) reconstruction at the time of meniscus repair is known to improve meniscus healing rates. This biological enhancement is primarily attributed to:

Explanation

Drilling femoral and tibial tunnels during ACL reconstruction releases bone marrow elements, stem cells, and growth factors into the intra-articular environment. This creates a biologically favorable hemarthrosis that significantly enhances meniscal healing.

Question 47

In acute Achilles tendon ruptures, recent high-level evidence comparing non-operative management utilizing early functional rehabilitation to surgical repair demonstrates:

Explanation

Modern meta-analyses show that when early functional rehabilitation (weight-bearing and early ROM) is employed, non-operative management has re-rupture rates equivalent to surgery. Furthermore, non-operative treatment completely avoids surgical complications such as infection and wound breakdown.

Question 48

Chronic exertional compartment syndrome (CECS) of the lower leg most commonly affects which compartment?

Explanation

The anterior compartment of the leg is the most frequently involved in chronic exertional compartment syndrome. Patients typically complain of pain, tightness, and occasionally transient foot drop during strenuous activities like running.

Question 49

The "Turf Toe" injury, commonly seen in football players on artificial surfaces, is defined as:

Explanation

Turf toe is a forced hyperextension injury of the first metatarsophalangeal (MTP) joint. This mechanism stretches or tears the plantar plate and capsuloligamentous complex, compromising MTP joint stability.

Question 50

Which of the following accurately describes the anatomy of the coracoclavicular (CC) ligaments?

Explanation

The coracoclavicular ligaments consist of the conoid and trapezoid. The conoid ligament is medial, posterior, and cone-shaped, acting as the primary restraint to superior translation, while the trapezoid is lateral and anterior.

Question 51

In the evaluation of femoroacetabular impingement (FAI), an alpha angle greater than 55 degrees measured on a modified Dunn lateral radiograph is most indicative of:

Explanation

The alpha angle is used to quantify the loss of anterior head-neck offset in the proximal femur. An angle greater than 50-55 degrees indicates the presence of a cam deformity, which can lead to chondrolabral damage during hip flexion.

Question 52

Long-term use of anabolic-androgenic steroids in power athletes is associated with an increased risk of tendon ruptures. On a cellular level, this is primarily due to:

Explanation

Anabolic steroids alter tendon biomechanics by producing a dysplastic collagen fibril architecture with decreased crimp. This reduces the tendon's ability to absorb shock and tensile loads, significantly increasing the risk of spontaneous rupture.

Question 53

A 45-year-old recreational tennis player undergoes arthroscopy for a symptomatic Type II SLAP tear. The most appropriate management to optimize return to play and patient satisfaction in this specific age demographic is:

Explanation

In patients older than 35-40 years with a Type II SLAP tear, primary biceps tenodesis yields better clinical outcomes, higher return to sport, and lower complication rates compared to SLAP repair. SLAP repairs in older patients often result in postoperative stiffness and persistent pain.

Question 54

The "killer turn" in Posterior Cruciate Ligament (PCL) reconstruction refers to the acute angle the graft must negotiate at the:

Explanation

In a transtibial PCL reconstruction, the graft must make an acute 90-degree turn as it exits the posterior tibial tunnel aperture to reach the femoral attachment. This "killer turn" can lead to increased graft abrasion and attenuation over time.

Question 55

An adolescent gymnast presents with insidious onset low back pain that is exacerbated by spine extension. Plain radiographs are completely normal. What is the most appropriate next step in imaging to evaluate for an acute pars interarticularis stress reaction?

Explanation

MRI of the lumbar spine without contrast is highly sensitive for detecting marrow edema indicative of an acute pars stress reaction before a fracture line appears. It avoids the ionizing radiation associated with CT scans, making it the preferred choice in pediatric athletes.

Question 56

According to the "Glenoid Track" concept in anterior shoulder instability, a Hill-Sachs lesion is considered "off-track" if it:

Explanation

An off-track Hill-Sachs lesion extends medial to the calculated medial margin of the glenoid track. This means the lesion can engage the anterior rim of the glenoid during abduction and external rotation, necessitating procedures like a remplissage or Latarjet.

Question 57

When performing an anatomic posterolateral corner (PLC) reconstruction of the knee, which three primary structures are typically reconstructed to restore varus and external rotation stability?

Explanation

Anatomic PLC reconstruction aims to recreate the three major static stabilizers of the posterolateral knee. These are the fibular collateral ligament (FCL), the popliteus tendon (PLT), and the popliteofibular ligament (PFL).

Question 58

During anterior cruciate ligament (ACL) reconstruction, tensioning the graft at which of the following knee flexion angles most closely restores intact knee kinematics when using a single-bundle construct?

Explanation

Tensioning an ACL graft at 20 to 30 degrees of flexion optimizes anterior-posterior stability and most closely reproduces normal knee kinematics. Tensioning in full extension can capture the knee and limit terminal extension.

Question 59

The primary underlying etiology of the Female Athlete Triad, now conceptualized as Relative Energy Deficiency in Sport (RED-S), is:

Explanation

The underlying driver of RED-S and the female athlete triad is low energy availability. This creates an energy deficit that disrupts the hypothalamic-pituitary-ovarian axis, leading to menstrual dysfunction and compromised bone health.

Question 60

According to current guidelines, autologous chondrocyte implantation (ACI) is most appropriate for which of the following femoral condyle cartilage defects?

Explanation

ACI is indicated for large (>2 cm2), symptomatic, focal, contained unipolar defects in young, active patients. Kissing lesions, small defects, and significant unaddressed bone loss are relative or absolute contraindications.

Question 61

A 32-year-old runner suffers a spontaneous Achilles tendon rupture after a recent course of ciprofloxacin. What is the cellular mechanism by which fluoroquinolones increase the risk of tendon rupture?

Explanation

Fluoroquinolones cause direct toxicity to tenocytes, leading to decreased cell proliferation and increased expression of matrix metalloproteinases (MMPs). This degrades the extracellular matrix, compromising tendon strength.

Question 62

A high school football player sustains a concussion. According to the standard graduated return-to-play protocol, what is the minimum duration required for each progression step before advancing to the next level?

Explanation

The standard graduated return-to-play protocol dictates that an athlete must remain asymptomatic for at least 24 hours at each step before progressing to the next intensity level. If symptoms return, they must drop back to the previous asymptomatic level.

Question 63

In an overhead throwing athlete, the "peel-back" mechanism contributing to Type II Superior Labrum Anterior to Posterior (SLAP) tears predominantly occurs in which shoulder position?

Explanation

The peel-back mechanism occurs during the late cocking phase of throwing, when the shoulder is in abduction and maximal external rotation. This position causes the biceps vector to shift posteriorly, creating a torsional force that peels the superior labrum off the glenoid.

Question 64

Which of the following statements accurately describes the biomechanical role of the anteromedial (AM) bundle of the anterior cruciate ligament?

Explanation

The AM bundle is tightest in flexion and is the primary restraint to anterior tibial translation at 90 degrees of flexion. The posterolateral (PL) bundle is tightest in extension and primarily controls rotatory stability.

Question 65

During reconstruction of the medial patellofemoral ligament (MPFL), the femoral tunnel must be placed accurately at Schöttle's point. Where is this radiographic point located on a true lateral radiograph?

Explanation

Schöttle's point is located 1 mm anterior to the posterior cortex extension line, 2.5 mm distal to the posterior border of the medial condyle origin, and proximal to the posterior extent of Blumensaat's line. Proper placement is crucial to avoid graft anisometry.

Question 66

The primary blood supply to the peripheral aspect of the menisci is derived from which of the following vessels?

Explanation

The peripheral 10-30% of the menisci is vascularized by the perimeniscal capillary plexus, which originates from the medial and lateral superior and inferior geniculate arteries. The inner portions are avascular and receive nutrition via diffusion.

Question 67

An anterior labroligamentous periosteal sleeve avulsion (ALPSA) lesion differs from a classic Bankart lesion in that the ALPSA lesion involves:

Explanation

In an ALPSA lesion, the anterior labrum is avulsed but the anterior scapular periosteum remains intact, acting as a sleeve. This allows the labroligamentous complex to heal in a medially displaced and externally rotated position, potentially leading to higher recurrence rates if not properly mobilized during repair.

Question 68

A volleyball player presents with posterior shoulder pain and isolated weakness in external rotation. An MRI reveals a paralabral cyst in the spinoglenoid notch. Which muscle is predominantly affected?

Explanation

The suprascapular nerve innervates both the supraspinatus and infraspinatus. Entrapment at the suprascapular notch affects both, whereas entrapment distal to this at the spinoglenoid notch leads to isolated infraspinatus weakness (external rotation).

Question 69

In a collegiate baseball pitcher, the primary restraint to valgus stress of the elbow at 90 degrees of flexion is the:

Explanation

The anterior bundle of the ulnar collateral ligament (UCL) is the primary restraint to valgus stress at the elbow from 30 to 120 degrees of flexion. It is the most commonly injured ligament in overhead throwing athletes.

Question 70

Which of the following compartment pressure measurements is diagnostic for chronic exertional compartment syndrome according to the Pedowitz criteria?

Explanation

Pedowitz criteria for chronic exertional compartment syndrome include a pre-exercise resting pressure > 15 mmHg, a 1-minute post-exercise pressure > 30 mmHg, or a 5-minute post-exercise pressure > 20 mmHg. Only one criterion needs to be met for diagnosis.

Question 71

A 16-year-old gymnast complains of chronic low back pain exacerbated by extension. Radiographs show a unilateral pars interarticularis defect at L5. What is the biomechanical mechanism most strongly associated with this condition?

Explanation

Spondylolysis in athletes is a stress fracture of the pars interarticularis typically caused by repetitive spinal hyperextension and rotation. It is most common at the L5 level and frequently seen in gymnasts, weightlifters, and football linemen.

Question 72

In athletes with femoroacetabular impingement (FAI), a Cam lesion typically produces chondral damage by which of the following mechanisms?

Explanation

A Cam lesion is an aspherical extension of the femoral head-neck junction. During hip flexion and internal rotation, this non-spherical portion enters the acetabulum, generating significant shear forces that peel the cartilage away from the labrum at the anterosuperior rim.

Question 73

A professional football player sustains an external rotation injury to his right ankle. The squeeze test is highly positive. Which syndesmotic ligament is typically the first to tear in this injury pattern?

Explanation

In a syndesmotic (high) ankle sprain, the external rotation force sequentially damages the stabilizing structures. The anterior inferior tibiofibular ligament (AITFL) is typically the first structure to fail, followed by the interosseous membrane and then the PITFL.

Question 74

When performing an isolated single-bundle posterior cruciate ligament (PCL) reconstruction using an anterolateral bundle equivalent, what is the optimal knee flexion angle for securing the graft?

Explanation

An isolated single-bundle PCL reconstruction typically recreates the stronger anterolateral (AL) bundle. Because the AL bundle is tightest in flexion, the graft is optimally tensioned and fixed at 90 degrees of knee flexion while applying an anterior drawer force.

Question 75

In posterior cruciate ligament (PCL) anatomy and biomechanics, which of the following statements most accurately describes the function of its distinct bundles?

Explanation

The PCL consists of the anterolateral (AL) and posteromedial (PM) bundles. The larger AL bundle is tight in flexion, providing the primary restraint to posterior tibial translation at 90 degrees, while the PM bundle is tight in extension.

Question 76

A 25-year-old professional baseball pitcher presents with gradual onset of medial elbow pain during the late cocking phase of throwing. MRI confirms a full-thickness tear of the anterior bundle of the ulnar collateral ligament (UCL). During UCL reconstruction, the surgeon must be aware that the primary restraint to valgus stress between 30 and 120 degrees of elbow flexion is the:

Explanation

The anterior bundle of the UCL is the primary restraint to valgus stress at the elbow from 30 to 120 degrees of flexion. Within it, the anterior band is most taut in extension to mid-flexion, bearing the primary load during the throwing motion.

Question 77

Biomechanical studies have demonstrated that a medial meniscus posterior root tear alters knee joint contact mechanics in a manner most biomechanically equivalent to which of the following?

Explanation

A medial meniscus posterior root tear completely disrupts the circumferential hoop stresses of the meniscus. Biomechanically, this results in increased peak contact pressures and decreased contact area equivalent to a total medial meniscectomy.

Question 78

During anatomic reconstruction of the medial patellofemoral ligament (MPFL), identifying the correct femoral attachment (Schöttle's point) is critical for restoring normal patellar kinematics. Radiographically, where is this point located on a strict lateral view of the knee?

Explanation

Schöttle's point is radiographically defined as 1 mm anterior to the posterior cortex line, 2.5 mm distal to the posterior origin of the medial femoral condyle, and proximal to the level of the posterior medial epicondyle.

Question 79

A 19-year-old female collegiate cross-country runner is diagnosed with the 'Female Athlete Triad'. Which of the following represents the primary underlying pathophysiologic driver of this condition?

Explanation

The Female Athlete Triad consists of low energy availability, menstrual dysfunction, and low bone mineral density. Low energy availability (caloric intake insufficient for energy expenditure) is the primary driver, leading to functional hypothalamic amenorrhea.

Question 80

A 22-year-old football player sustains a posterolateral corner (PLC) injury. During clinical evaluation, increased varus gapping is noted at 30 degrees of knee flexion, but not at 0 degrees. Which structure is the primary restraint being tested at 30 degrees of flexion?

Explanation

The fibular collateral ligament (FCL) is the primary restraint to varus stress at 30 degrees of knee flexion. If varus gapping is present at 0 degrees, it typically indicates combined cruciate and FCL injuries.

Question 81

Which of the following cellular changes is considered the histologic hallmark of chronic tendinopathy (e.g., tennis elbow or Achilles tendinopathy) rather than an acute inflammatory process?

Explanation

Chronic tendinopathy is characterized by angiofibroblastic hyperplasia (tendinosis), marked by disorganized collagen (primarily type III), hypercellularity of fibroblasts, and neovascularization, without a significant acute inflammatory infiltrate.

Question 82

An elite weightlifter undergoes surgical repair for a pectoralis major tendon rupture sustained during a heavy bench press. Which anatomical segment of the pectoralis major is most commonly ruptured and typically requires anatomic reattachment?

Explanation

Pectoralis major ruptures most commonly involve the sternal head at or near its humeral insertion. The sternal fibers are uniquely stressed during the eccentric phase of heavy bench pressing due to their twisted distal insertion.

Question 83

When evaluating an overhead throwing athlete for Glenohumeral Internal Rotation Deficit (GIRD), adaptive changes to the shoulder capsule are typically observed. GIRD is primarily attributed to contracture of which capsular structure?

Explanation

GIRD is clinically characterized by a loss of internal rotation compared to the contralateral shoulder. It is primarily caused by contracture and thickening of the posterior-inferior capsule resulting from repetitive deceleration forces during throwing.

Question 84

A 30-year-old athlete sustains an acute Achilles tendon rupture. In counseling the patient regarding nonoperative versus operative management, current evidence suggests that operative management is associated with which of the following compared to nonoperative management with early functional rehabilitation?

Explanation

Recent high-quality studies show that when early functional rehabilitation protocols are utilized, the re-rupture rates between operative and nonoperative management are similar. Operative management carries a higher risk of complications like wound breakdown and infection.

Question 85

The Latarjet procedure is often used for recurrent anterior shoulder instability with significant glenoid bone loss. What is the most commonly injured nerve during this procedure?

Explanation

The musculocutaneous nerve is the most commonly injured nerve during a Latarjet procedure due to its proximity to the coracoid process and conjoint tendon, which is mobilized and transferred during the operation.

Question 86

A 16-year-old gymnast complains of chronic lower back pain exacerbated by extension. Imaging reveals a pars interarticularis defect (spondylolysis). Which spinal level is most frequently affected in this population?

Explanation

Spondylolysis most commonly occurs at the L5 vertebral level. It is frequently seen in young athletes subjected to repetitive lumbar hyperextension, such as gymnasts and football linemen.

Question 87

A high school football player suffers a suspected concussion. According to the standard return-to-play guidelines (Concussion in Sport Group), what is the minimum duration required for each progression step before advancing to the next level of exertion?

Explanation

The return-to-play protocol involves a stepwise progression of activity. Athletes must remain asymptomatic for at least 24 hours at each step before advancing to the next level of exertion.

Question 88

Internal snapping hip syndrome is often a source of groin pain in dancers and martial artists. The snapping sensation is typically caused by the snapping of which structure over the iliopectineal eminence?

Explanation

Internal snapping hip (coxa saltans interna) occurs when the iliopsoas tendon snaps over the iliopectineal eminence or the anterior femoral head, often producing an audible click and groin pain.

Question 89

During the 'screw-home' mechanism of the knee in terminal extension, there is an obligatory external rotation of the tibia relative to the femur. This is primarily driven by which anatomical feature?

Explanation

The 'screw-home' mechanism is passively driven by the asymmetry of the femoral condyles; the medial femoral condyle has a longer articular surface. This dictates external tibial rotation as the knee locks into full extension.

Question 90

An 18-year-old soccer player sustains an inversion ankle injury. Clinical examination shows a positive squeeze test and positive external rotation stress test. Which of the following syndesmotic ligaments is typically the first to tear in a high ankle sprain?

Explanation

In syndesmotic (high ankle) sprains, external rotation forces typically cause progressive injury from anterior to posterior. The anterior inferior tibiofibular ligament (AITFL) is the first and most commonly injured structure.

Question 91

A 28-year-old bodybuilder admits to chronic use of anabolic-androgenic steroids to enhance performance. Which of the following lipid profile alterations is most characteristic of anabolic steroid abuse?

Explanation

Anabolic-androgenic steroid abuse is strongly associated with adverse cardiovascular risk profiles, most notably a severe depression of high-density lipoprotein (HDL) and an elevation of low-density lipoprotein (LDL).

Question 92

In the setting of exertional compartment syndrome of the lower leg, standard criteria (Pedowitz) utilize intracompartmental pressure measurements for diagnosis. Which of the following pressure readings confirms the diagnosis?

Explanation

The Pedowitz criteria for chronic exertional compartment syndrome include a resting pressure ≥ 15 mmHg, a 1-minute post-exercise pressure ≥ 30 mmHg, or a 5-minute post-exercise pressure ≥ 20 mmHg. Any one of these confirms the diagnosis.

Question 93

A 35-year-old recreational basketball player suffers a patellar tendon rupture. Biomechanically, the patella functions primarily to increase the mechanical advantage of the quadriceps by:

Explanation

The patella acts as a fulcrum to increase the moment arm (lever arm) of the quadriceps muscle group. This significantly increases the mechanical advantage and force generation of the extensor mechanism.

Question 94

Cam-type femoroacetabular impingement (FAI) is frequently diagnosed in young male athletes with groin pain. The underlying pathomorphology is best described by which of the following?

Explanation

Cam-type FAI is caused by an aspherical femoral head (often a 'bump' at the anterolateral head-neck junction), which leads to a decreased head-neck offset. This asphericity causes a shear injury to the acetabular cartilage and labrum during flexion.

Orthopedic Prometric MCQs - Chapter 3 Part 1

Orthopedic Prometric MCQs - Chapter 3 Part 41

Orthopedic Prometric MCQs - Chapter 3 Part 41

Chapter Index