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9. Shoulder and Elbow MCQs

Practice Set 28 of 197

This practice set contains high-yield board review questions covering key concepts in 9. Shoulder and Elbow. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 541

Topic: 9. Shoulder and Elbow

A counterforce brace (tennis elbow strap) is commonly prescribed for lateral epicondylitis. What is its primary biomechanical mechanism of action?

. Immobilizing the wrist to prevent forced extension
. Applying direct pressure to the radial nerve to reduce nociceptive input
. Dispersing mechanical forces away from the pathological extensor origin
. Increasing blood flow to the lateral epicondyle via continuous compression
. Preventing full extension of the elbow joint to reduce capsular strain

Correct Answer & Explanation

. Dispersing mechanical forces away from the pathological extensor origin

Explanation

A counterforce brace applies pressure over the common extensor muscle belly. This effectively creates a new, distal origin for the muscle fibers, reducing the tension and dispersing mechanical forces transmitted to the pathological ECRB origin.

Question 542

Topic: Elbow & Forearm

What is a recognized advantage of arthroscopic release of the ECRB over open release for refractory lateral epicondylitis?

. Lower risk of posterior interosseous nerve injury
. Ability to directly inspect the radiocapitellar joint for intra-articular pathology
. Direct visualization and primary repair of the lateral ulnar collateral ligament
. Significantly superior long-term patient-reported outcome scores
. Elimination of the risk of postoperative posterolateral rotatory instability

Correct Answer & Explanation

. Ability to directly inspect the radiocapitellar joint for intra-articular pathology

Explanation

Arthroscopic release allows for direct inspection of the radiocapitellar joint to rule out or treat intra-articular pathology, such as synovial plicae or chondral defects. Long-term functional outcomes are generally comparable between open and arthroscopic techniques.

Question 543

Topic: Elbow & Forearm

According to the Nirschl classification of tendinosis, what characterizes stage 3 lateral epicondylitis?

. Inflammatory changes without any structural tendon alteration
. Angiofibroblastic degeneration without structural rupture
. Structural failure and tendinosis with partial or complete macroscopic rupture
. Fibrosis and dense calcification of the entire tendon origin
. Secondary bony changes with lateral epicondyle spur formation

Correct Answer & Explanation

. Structural failure and tendinosis with partial or complete macroscopic rupture

Explanation

Nirschl stage 3 is defined by structural failure (partial or complete tear) in the setting of angiofibroblastic tendinosis. Stage 1 is inflammatory, and stage 2 is angiofibroblastic degeneration without frank rupture.

Question 544

Topic: Elbow & Forearm

When performing an open Nirschl procedure for lateral epicondylitis, the surgeon splits the common extensor fascia. The pathologic ECRB tissue is found directly deep to which structure(s)?

. Extensor carpi radialis longus (ECRL) and Extensor digitorum communis (EDC)
. Brachioradialis
. Supinator
. Lateral ulnar collateral ligament (LUCL)
. Anconeus

Correct Answer & Explanation

. Extensor carpi radialis longus (ECRL) and Extensor digitorum communis (EDC)

Explanation

The ECRB lies deep to the extensor carpi radialis longus (ECRL) and the extensor digitorum communis (EDC). The standard open approach requires splitting or retracting the ECRL/EDC interval to visualize the degenerated ECRB.

Question 545

Topic: 9. Shoulder and Elbow

Which of the following is considered an independent occupational risk factor for the development of lateral epicondylitis?

. Prolonged static overhead lifting
. Repetitive forceful grip coupled with forearm pronation and supination
. Constant resting of the olecranon on hard surfaces
. Operating heavy vibrating machinery exclusively with the shoulder
. Frequent deep knee flexion and lifting from the floor

Correct Answer & Explanation

. Repetitive forceful grip coupled with forearm pronation and supination

Explanation

Repetitive forceful grip coupled with forearm pronation/supination or wrist extension places high eccentric loads on the common extensor origin. This mechanism serves as a classic occupational and athletic risk factor for lateral epicondylitis.

Question 546

Topic: 9. Shoulder and Elbow

A 28-year-old athlete complains of lateral elbow pain and catching. MRI reveals a thickened posterolateral synovial fold. If this symptomatic radiocapitellar plica is misdiagnosed as lateral epicondylitis, which clinical feature helps differentiate the two?

. Severe pain exclusively on resisted wrist extension
. A painful click or snap localized to the radiocapitellar joint with elbow flexion and extension
. Numbness and tingling in the dorsal web space
. Profound weakness in isolated finger extension
. Improvement of symptoms with a static wrist extension splint

Correct Answer & Explanation

. A painful click or snap localized to the radiocapitellar joint with elbow flexion and extension

Explanation

A symptomatic radiocapitellar plica typically presents with mechanical symptoms such as snapping, catching, or clicking during terminal elbow extension. Lateral epicondylitis usually lacks these mechanical intra-articular symptoms.

Question 547

Topic: Elbow & Forearm

In the management of lateral epicondylitis, what is the generally accepted minimum duration of failed conservative treatment before surgical intervention is recommended?

. 6 weeks
. 3 months
. 6 to 12 months
. 2 years
. Surgical treatment should be offered immediately if MRI confirms any partial tearing

Correct Answer & Explanation

. 6 to 12 months

Explanation

Surgical management (e.g., ECRB debridement/release) is typically reserved for patients who have failed a comprehensive nonoperative regimen for at least 6 to 12 months. Most cases of lateral epicondylitis resolve with conservative care within this timeframe.

Question 548

Topic: Elbow & Forearm

A patient with lateral epicondylitis is considering injection therapies. How do platelet-rich plasma (PRP) injections compare to corticosteroid injections for this condition based on long-term randomized controlled trials?

. PRP is vastly superior for acute pain relief within the first 2 weeks.
. Corticosteroids provide better overall pain relief and function at 1 to 2 years.
. PRP provides significantly better pain reduction and functional improvement at 1 to 2 years.
. There is no functional difference between the two treatments at any time point.
. Corticosteroids promote superior macroscopic structural healing on postoperative MRI.

Correct Answer & Explanation

. PRP provides significantly better pain reduction and functional improvement at 1 to 2 years.

Explanation

Studies demonstrate that while corticosteroids offer better short-term relief, PRP yields significantly better pain and functional outcomes at intermediate and long-term follow-ups (1 to 2 years). Corticosteroids are associated with a higher long-term recurrence rate.

Question 549

Topic: Elbow & Forearm

An open lateral epicondyle release is planned. To accurately identify the ECRB, the surgeon assesses its origin relative to the ECRL. What is the spatial relationship of the ECRL origin to the ECRB origin?

. The ECRL originates proximally on the lateral supracondylar ridge.
. The ECRL originates directly distal to the ECRB on the lateral epicondyle.
. The ECRL originates posterior to the ECRB, blending directly with the triceps fascia.
. The ECRL originates deep to the ECRB on the lateral joint capsule.
. The ECRL originates anterior to the ECRB from the coronoid process.

Correct Answer & Explanation

. The ECRL originates proximally on the lateral supracondylar ridge.

Explanation

The Extensor Carpi Radialis Longus (ECRL) originates proximally on the lateral supracondylar ridge. The ECRB originates slightly distal to this, directly on the lateral epicondyle, which helps the surgeon differentiate the two during dissection.

Question 550

Topic: Elbow & Forearm

What is the most characteristic finding of lateral epicondylitis on a high-resolution musculoskeletal ultrasound?

. A thin, homogeneously hyper-reflective common extensor tendon
. Focal hypoechoic areas, tendon thickening, and increased Doppler flow at the ECRB origin
. A large anechoic cyst compressing the posterior interosseous nerve
. Hyperechoic shadowing strictly confined to the brachioradialis muscle belly
. Diffuse atrophy and fatty infiltration of the extensor carpi ulnaris

Correct Answer & Explanation

. Focal hypoechoic areas, tendon thickening, and increased Doppler flow at the ECRB origin

Explanation

On ultrasound, lateral epicondylitis (tendinosis) is characterized by thickening of the common extensor tendon and focal hypoechoic regions representing myxoid degeneration. Neovascularization is also frequently demonstrated by increased color Doppler signal.

Question 551

Topic: Elbow & Forearm

Following an open ECRB debridement and repair for recalcitrant lateral epicondylitis, which of the following represents the most appropriate initial postoperative rehabilitation protocol?

. Immediate aggressive active wrist extension exercises against resistance on postoperative day 1
. Rigid immobilization in 90 degrees of flexion with the wrist in full flexion for 6 weeks
. Brief immobilization for 1-2 weeks followed by gentle active range of motion and progressive strengthening at 4-6 weeks
. Strict cast immobilization for 8 weeks followed by manipulation under anesthesia
. Immediate return to full sports activities utilizing a counterforce brace

Correct Answer & Explanation

. Brief immobilization for 1-2 weeks followed by gentle active range of motion and progressive strengthening at 4-6 weeks

Explanation

Postoperative protocols typically involve a brief period of rest or splinting for 7-14 days to allow soft tissue healing. This is followed by a gradual progression of stretching and gentle active ROM, delaying heavy resistance training until 4-6 weeks.

Question 552

Topic: Elbow & Forearm

Tissue sampled during operative debridement of refractory lateral epicondylitis will most likely demonstrate which of the following histologic findings?

. Acute inflammatory infiltrate with dense neutrophil accumulation
. Angiofibroblastic hyperplasia with disorganized collagen
. Granulomatous inflammation with multinucleated giant cells
. Chondroid metaplasia with focal dystrophic calcification
. Fibrinoid necrosis with transmural vasculitis

Correct Answer & Explanation

. Angiofibroblastic hyperplasia with disorganized collagen

Explanation

Lateral epicondylitis is a degenerative tendinopathy (tendinosis) rather than a true inflammatory process. Histology classically shows angiofibroblastic hyperplasia, characterized by disorganized collagen, increased fibroblasts, and vascular hyperplasia without acute inflammatory cells.

Question 553

Topic: Elbow & Forearm

A 45-year-old man undergoes an open debridement of the extensor carpi radialis brevis (ECRB) origin for recalcitrant lateral epicondylitis. Postoperatively, he complains of lateral elbow pain and mechanical clicking when pushing up from a chair. Injury to which of the following structures during the surgical approach is the most likely cause of his new symptoms?

. Annular ligament
. Radial collateral ligament
. Lateral ulnar collateral ligament
. Interosseous membrane
. Extensor digitorum communis

Correct Answer & Explanation

. Lateral ulnar collateral ligament

Explanation

The lateral ulnar collateral ligament (LUCL) is the primary restraint to posterolateral rotatory instability (PLRI) of the elbow. Iatrogenic injury to the LUCL can occur during ECRB debridement if the dissection extends too posterior or deep, resulting in symptomatic PLRI.

Question 554

Topic: Elbow & Forearm

A 40-year-old recreational tennis player is diagnosed with lateral epicondylitis. He is considering a corticosteroid injection. Based on high-level evidence, what should the patient be counseled regarding the use of corticosteroid injections compared to physical therapy or watchful waiting?

. Superior short-term and long-term pain relief
. Superior short-term relief but higher recurrence and worse long-term outcomes at 1 year
. Inferior short-term relief but superior long-term outcomes at 1 year
. No difference in short-term or long-term outcomes
. Decreased risk of tendon rupture compared to conservative management

Correct Answer & Explanation

. Superior short-term relief but higher recurrence and worse long-term outcomes at 1 year

Explanation

Multiple randomized controlled trials have shown that corticosteroid injections for lateral epicondylitis provide superior short-term pain relief (at 4-6 weeks). However, they result in higher recurrence rates and worse long-term outcomes (at 1 year) compared to physical therapy or watchful waiting.

Question 555

Topic: 9. Shoulder and Elbow

A patient presents with lateral elbow pain. Resistance to extension of the middle finger with the elbow fully extended reproduces the patient's severe lateral pain. This finding (Maudsley's test) specifically evaluates the insertion of which of the following structures?

. Extensor carpi radialis longus
. Extensor carpi ulnaris
. Extensor digitorum communis
. Brachioradialis
. Supinator

Correct Answer & Explanation

. Extensor digitorum communis

Explanation

Maudsley's test involves resisted extension of the middle finger, which specifically loads the extensor digitorum communis (EDC) muscle. Since the ECRB and EDC origins are intimately blended at the lateral epicondyle, this maneuver places tension on the diseased origin, reproducing pain.

Question 556

Topic: Elbow & Forearm

During an arthroscopic release for lateral epicondylitis, the surgeon views the lateral compartment from the proximal anteromedial portal. The diseased ECRB tendon is identified. What is the correct anatomic relationship of the ECRB tendon in this region?

. Intra-articular, deep to the joint capsule
. Extra-articular, superficial to the joint capsule and deep to the extensor digitorum communis
. Extra-articular, superficial to the joint capsule and superficial to the extensor carpi radialis longus
. Intra-articular, piercing the annular ligament
. Extra-articular, intimately blended with the insertion of the brachialis tendon

Correct Answer & Explanation

. Extra-articular, superficial to the joint capsule and deep to the extensor digitorum communis

Explanation

Arthroscopically, the ECRB origin is located extra-articularly. It lies immediately superficial to the anterolateral joint capsule and deep to the extensor digitorum communis (EDC) and extensor carpi radialis longus (ECRL).

Question 557

Topic: Elbow & Forearm

A 38-year-old carpenter has persistent lateral elbow pain that has failed 6 months of eccentric exercise therapy. Physical examination reveals a positive apprehension test when applying a valgus, axial, and supination force to the elbow during flexion. MRI shows a partial tear of the common extensor origin. What concurrent MRI finding is most likely present given the examination?

. Hyperintensity and thickening of the radial nerve in the arcade of Frohse
. Edema at the supinator crest of the ulna and a tear of the LUCL
. Osteochondral defect of the capitellum
. Hypertrophy of the anconeus muscle
. Fluid within the olecranon bursa

Correct Answer & Explanation

. Edema at the supinator crest of the ulna and a tear of the LUCL

Explanation

The physical examination describes a positive posterolateral rotatory instability (PLRI) apprehension test. PLRI is caused by insufficiency of the lateral ulnar collateral ligament (LUCL), which originates near the common extensor origin and inserts on the supinator crest of the ulna.

Question 558

Topic: Elbow & Forearm

A surgeon performs an open surgical release of the common extensor origin for chronic lateral epicondylitis. To minimize the risk of iatrogenic injury to the posterior interosseous nerve (PIN), the deep distal dissection should generally remain proximal to which of the following anatomic landmarks?

. The arcade of Frohse
. The equator of the radial head
. The annular ligament
. The bicipital tuberosity
. The lateral supracondylar ridge

Correct Answer & Explanation

. The equator of the radial head

Explanation

The posterior interosseous nerve (PIN) crosses the radiocapitellar joint and enters the supinator muscle. To avoid PIN injury during open lateral epicondylar release, dissection should safely remain proximal to the equator (mid-portion) of the radial head.

Question 559

Topic: 9. Shoulder and Elbow

High-resolution diagnostic ultrasound is utilized to evaluate a 50-year-old woman with suspected recalcitrant lateral epicondylitis. Which of the following sonographic findings is most characteristic of this condition?

. Hyperechoic thickening of the tendon origin with posterior acoustic shadowing
. Hypoechoic areas, focal tendon thickening, and hypervascularity on color Doppler
. Anechoic fluid collection deep to the extensor aponeurosis with intact parallel fibrillar lines
. Diffuse thinning of the common extensor tendon with peripheral hyperechogenicity
. Dynamic subluxation of the extensor tendon during elbow flexion

Correct Answer & Explanation

. Hypoechoic areas, focal tendon thickening, and hypervascularity on color Doppler

Explanation

On ultrasound, lateral epicondylitis (tendinosis) is typically characterized by hypoechoic changes (representing mucoid degeneration and microtearing), increased tendon thickness, and neovascularity visible on color Doppler imaging.

Question 560

Topic: 9. Shoulder and Elbow

The extensor carpi radialis brevis (ECRB) is the primary structure involved in lateral epicondylitis. What position of the wrist and elbow places the ECRB under the greatest passive tension?

. Elbow extension, wrist flexion, and forearm pronation
. Elbow extension, wrist extension, and forearm supination
. Elbow flexion, wrist flexion, and forearm pronation
. Elbow flexion, wrist extension, and forearm supination
. Elbow extension, wrist flexion, and forearm supination

Correct Answer & Explanation

. Elbow extension, wrist flexion, and forearm pronation

Explanation

The ECRB originates from the lateral epicondyle and inserts at the base of the third metacarpal. Passive tension on the ECRB is maximized by extending the elbow, flexing the wrist, and pronating the forearm, which forms the basis for Mill's test.

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