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9. Shoulder and Elbow MCQs

Practice Set 23 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 441

Topic: 9. Shoulder and Elbow

A 38-year-old athlete undergoes a single-incision distal biceps tendon repair with cortical button fixation. According to the standard post-operative rehabilitation protocol described in the case, what is the most appropriate activity during the initial 2 weeks (Phase I)?

. Active resisted supination exercises
. Full active elbow extension against gravity
. Passive elbow flexion from 30 to 90 degrees
. Lifting objects up to 5 pounds
. Unrestricted active forearm pronation and supination

Correct Answer & Explanation

. Passive elbow flexion from 30 to 90 degrees

Explanation

Correct Answer: CThe 'Post-Operative Rehabilitation Protocols' section, under 'Phase I Protection & Early Motion', specifies:"Passive Elbow Flexion/Extension: 30-90 degrees for the first 2 weeks, progressing to 15-115 degrees by week 4. Therapist-assisted, non-weight-bearing."It also explicitly states:"Avoid resisted supination"and"No weight bearing through the affected arm. Avoid lifting anything heavier than a cup of coffee."Unrestricted active pronation and supination are also not allowed in Phase I, with supination often restricted to a limited passive range (e.g., 0-30 degrees) to protect the repair.

Question 442

Topic: 9. Shoulder and Elbow

A 55-year-old male sustains a complete distal biceps tendon rupture. He opts for non-operative management due to personal preference and a sedentary lifestyle. Based on the biomechanical principles outlined in the case, what is the most significant functional deficit he is likely to experience?

. Loss of elbow extension strength
. Significant loss of forearm pronation strength
. Marked reduction in grip strength
. Substantial loss of forearm supination strength
. Impaired wrist flexion strength

Correct Answer & Explanation

. Substantial loss of forearm supination strength

Explanation

Correct Answer: DThe 'Surgical Anatomy & Biomechanics' section clearly states:"Biomechanically, the distal biceps tendon is the primary supinator of the forearm, contributing approximately 80% of supination power, particularly against resistance."It further notes that"Loss of this insertion leads to substantial functional deficits, especially for activities requiring powerful supination, such as using a screwdriver, turning a doorknob, or lifting heavy objects with the palm up."While it also contributes to elbow flexion (30-40%), the loss of supination strength (often 40-50%) is highlighted as the most significant functional deficit. The biceps is not a primary elbow extensor, pronator, or wrist flexor, nor does it directly contribute significantly to grip strength.

Question 443

Topic: Elbow & Forearm

A surgeon is performing a distal biceps tendon repair. After retrieving the tendon, they note its unique twisted morphology. Which statement accurately describes the anatomical insertion of the biceps tendon fibers onto the radial tuberosity?

. The long head fibers insert more distally and anteriorly.
. The short head fibers insert more proximally and posteriorly.
. The tendon inserts onto the lateral-sided aspect of the radial tuberosity.
. The short head fibers insert more distally and anteriorly, and the long head fibers insert more proximally and posteriorly.
. The tendon inserts primarily into the interosseous membrane.

Correct Answer & Explanation

. The short head fibers insert more distally and anteriorly, and the long head fibers insert more proximally and posteriorly.

Explanation

Correct Answer: DThe 'Surgical Anatomy & Biomechanics' section describes the unique twist of the distal biceps tendon:"This twist results in the short head fibers inserting more distally and anteriorly on the radial tuberosity, and the long head fibers inserting more proximally and posteriorly."It also clarifies the insertion point:"The distal biceps tendon inserts onto the roughened, ulnar-sided aspect of the radial tuberosity."Therefore, options A, B, C, and E are incorrect based on this detailed anatomical description.

Question 444

Topic: Elbow & Forearm

A 32-year-old male undergoes a single-incision anterior repair of a distal biceps tendon rupture. Postoperatively, he notes numbness over the radial aspect of his volar forearm. Injury to which of the following structures is the most likely cause?

. Radial nerve
. Posterior interosseous nerve
. Lateral antebrachial cutaneous nerve
. Medial antebrachial cutaneous nerve
. Superficial radial nerve

Correct Answer & Explanation

. Lateral antebrachial cutaneous nerve

Explanation

The lateral antebrachial cutaneous nerve (LABC) is the most commonly injured nerve during a single-incision anterior approach to the distal biceps, typically secondary to superficial retraction.

Question 445

Topic: 9. Shoulder and Elbow

Non-operative management of a complete distal biceps tendon rupture typically results in the greatest permanent deficit in which of the following upper extremity functions?

. Elbow extension strength
. Elbow flexion strength
. Forearm pronation strength
. Forearm supination strength
. Grip strength

Correct Answer & Explanation

. Forearm supination strength

Explanation

Chronic, un-repaired distal biceps ruptures result in a substantial loss of forearm supination strength (up to 40-50%) and a lesser degree of elbow flexion strength loss (approximately 30%).

Question 446

Topic: Elbow & Forearm

A 28-year-old weightlifter presents with acute elbow pain and a positive 'hook test.' During surgical repair utilizing a modified two-incision technique, the surgeon must carefully avoid subperiosteal dissection of the ulna to minimize the risk of which complication?

. Ulnar nerve entrapment
. Radial nerve palsy
. Proximal radioulnar synostosis
. Medial collateral ligament insufficiency
. Brachial artery pseudoaneurysm

Correct Answer & Explanation

. Proximal radioulnar synostosis

Explanation

The classic two-incision technique for distal biceps repair is associated with an increased risk of proximal radioulnar synostosis (heterotopic ossification) if subperiosteal dissection of the ulna occurs.

Question 447

Topic: 9. Shoulder and Elbow

During anatomical reattachment of the distal biceps tendon, the surgeon must consider its distinct two-bundle anatomy. Which of the following best describes the anatomical insertion and biomechanical function of the long head of the distal biceps?

. Inserts anteriorly and distally on the radial tuberosity, acting as the primary elbow flexor
. Inserts posteriorly and proximally on the radial tuberosity, acting as the primary forearm supinator
. Inserts on the ulnar tuberosity, providing dynamic stability to the medial elbow
. Inserts continuously with the brachialis, allowing for independent pronation
. Blends with the bicipital aponeurosis, contributing exclusively to forearm pronation

Correct Answer & Explanation

. Inserts posteriorly and proximally on the radial tuberosity, acting as the primary forearm supinator

Explanation

The long head of the biceps inserts proximally and posteriorly on the radial tuberosity, providing its powerful supination moment. The short head inserts more distally and anteriorly, acting primarily as a flexor.

Question 448

Topic: 9. Shoulder and Elbow

A 45-year-old male presents 3 months after feeling a pop in his anterior elbow. He has not sought prior medical attention. Examination reveals a positive hook test and proximal retraction of the muscle belly. If this patient elects for non-operative management, he will likely experience the greatest functional deficit in which of the following motions?

. Elbow flexion
. Elbow extension
. Forearm pronation
. Forearm supination
. Shoulder forward elevation

Correct Answer & Explanation

. Forearm supination

Explanation

Non-operative management of a distal biceps tendon rupture results in approximately a 40-50% loss of sustained supination strength and endurance. Flexion strength is also diminished, but to a lesser degree (approximately 30%).

Question 449

Topic: Elbow & Forearm

During a single-incision anterior approach for a distal biceps tendon repair, the surgeon must be careful to protect a sensory nerve that exits the deep fascia just lateral to the biceps tendon. Injury to this nerve leads to numbness in what distribution?

. Lateral aspect of the forearm
. Medial aspect of the forearm
. Dorsal web space between the thumb and index finger
. Volar aspect of the thumb
. Posterior aspect of the upper arm

Correct Answer & Explanation

. Lateral aspect of the forearm

Explanation

The lateral antebrachial cutaneous nerve (LABC) is at highest risk during a single-incision anterior biceps repair. It runs between the biceps and brachialis and exits laterally, supplying sensation to the lateral forearm.

Question 450

Topic: Elbow & Forearm

Which of the following complications is historically more common with a two-incision approach for distal biceps repair compared to a single-incision anterior approach?

. Lateral antebrachial cutaneous nerve palsy
. Radial artery injury
. Proximal radioulnar synostosis
. Posterior interosseous nerve injury
. Median nerve injury

Correct Answer & Explanation

. Proximal radioulnar synostosis

Explanation

The two-incision (Boyd-Anderson or Morrey modification) approach historically carries a higher risk of proximal radioulnar synostosis or heterotopic ossification compared to the single-incision approach. Single-incision approaches carry a higher risk of LABC nerve injury.

Question 451

Topic: Elbow & Forearm

When restoring the anatomical footprint during a distal biceps tendon repair, the tendon should be reattached to which specific aspect of the radial tuberosity to maximize supination strength?

. Anterior aspect
. Ulnar aspect
. Radial aspect
. Superior pole
. Inferior pole

Correct Answer & Explanation

. Ulnar aspect

Explanation

The normal anatomical insertion of the distal biceps tendon is on the ulnar (posterior) aspect of the radial tuberosity. Reattaching it more anteriorly creates a cam effect that significantly reduces the mechanical advantage for supination.

Question 452

Topic: Elbow & Forearm

A 45-year-old weightlifter feels a sharp pop in his elbow. On physical exam, the physician is unable to hook their index finger under the lateral edge of the biceps tendon when the patient's elbow is actively flexed to 90 degrees and supinated. This clinical test evaluates the integrity of what structure?

. Lacertus fibrosus
. Pronator teres insertion
. Brachialis tendon
. Distal biceps tendon
. Brachioradialis tendon

Correct Answer & Explanation

. Distal biceps tendon

Explanation

The 'hook test' is a highly sensitive and specific examination maneuver for diagnosing complete distal biceps tendon ruptures. An intact tendon allows the examiner to hook their finger behind it from the lateral side.

Question 453

Topic: Elbow & Forearm

A patient is evaluated for an acute complete distal biceps rupture. If the surgeon decides to proceed with an anatomic repair, failure to fully release which of the following structures may limit mobilization of the retracted tendon?

. Lacertus fibrosus (bicipital aponeurosis)
. Transverse carpal ligament
. Arcade of Frohse
. Brachialis fascia
. Ligament of Struthers

Correct Answer & Explanation

. Lacertus fibrosus (bicipital aponeurosis)

Explanation

The lacertus fibrosus (bicipital aponeurosis) extends from the distal biceps medially over the flexor-pronator mass. If it remains intact during an injury, it may prevent proximal retraction, but if scarred or retracted, it must be released to properly mobilize the tendon for repair.

Question 454

Topic: Elbow & Forearm

A 50-year-old male presents with a chronic distal biceps rupture that occurred 3 months ago. Intraoperatively, the tendon is found to be severely retracted and cannot be mobilized to the radial tuberosity even with the elbow flexed. Which of the following is the most appropriate reconstruction option?

. Tenodesis to the brachialis tendon
. Primary repair using high-strength suture only
. Reconstruction using an autograft or allograft (e.g., semitendinosus or Achilles)
. Transfer of the triceps tendon
. Radial head excision

Correct Answer & Explanation

. Reconstruction using an autograft or allograft (e.g., semitendinosus or Achilles)

Explanation

In chronic, retracted distal biceps ruptures where the native tendon cannot reach the radial tuberosity, reconstruction with a robust graft (such as semitendinosus autograft or Achilles allograft) is indicated to restore supination and flexion strength.

Question 455

Topic: Elbow & Forearm

During a two-incision approach for a distal biceps tendon repair, the forearm should be placed in which position while the surgeon spreads through the extensor muscle mass to expose the radial tuberosity, in order to protect the posterior interosseous nerve (PIN)?

. Maximum supination
. Neutral rotation
. Maximum pronation
. 90 degrees of flexion
. Maximum extension

Correct Answer & Explanation

. Maximum pronation

Explanation

During the posterolateral exposure in a two-incision distal biceps repair, the forearm must be kept in maximum pronation. This position pulls the PIN anteriorly and medially, safely distancing it from the surgical field around the radial neck.

Question 456

Topic: Elbow & Forearm

A 45-year-old bodybuilder feels a sudden pop in his antecubital fossa while performing heavy curls. He presents with ecchymosis and a palpable defect. The physician asks the patient to actively supinate the forearm and flex the elbow to 90 degrees, then hooks an index finger under a cord-like structure from the lateral side. The structure is absent. Which of the following tendons is most likely ruptured?

. Brachialis
. Coracobrachialis
. Distal biceps brachii
. Brachioradialis
. Triceps brachii

Correct Answer & Explanation

. Distal biceps brachii

Explanation

The clinical maneuver described is the Hook test, which is highly sensitive and specific for evaluating a distal biceps tendon rupture. An intact tendon allows the examiner to hook a finger under it; an absent or retracted tendon yields a positive test.

Question 457

Topic: Elbow & Forearm

A 38-year-old male undergoes a single-incision anterior repair of a distal biceps tendon rupture. Postoperatively, he complains of numbness and tingling over the radial aspect of his volar forearm. Which of the following nerves was most likely injured or compressed during the surgical approach?

. Medial antebrachial cutaneous nerve
. Lateral antebrachial cutaneous nerve
. Posterior interosseous nerve
. Superficial radial nerve
. Ulnar nerve

Correct Answer & Explanation

. Lateral antebrachial cutaneous nerve

Explanation

The lateral antebrachial cutaneous nerve (LABC) is the most commonly injured nerve during a single-incision anterior approach to the distal biceps. Retraction of the skin and subcutaneous tissues laterally places it at high risk.

Question 458

Topic: Elbow & Forearm

During a distal biceps tendon repair, the surgeon must decide where to reattach the tendon on the radial tuberosity to optimize postoperative functional mechanics. Reattachment to which aspect of the tuberosity best restores maximum supination strength?

. Anterior aspect
. Radial (lateral) aspect
. Proximal tip
. Ulnar (medial) aspect
. Distal-most aspect

Correct Answer & Explanation

. Ulnar (medial) aspect

Explanation

To maximize the cam effect and restore full supination strength, the distal biceps tendon must be anatomically reattached to the ulnar (medial) aspect of the radial tuberosity.

Question 459

Topic: Elbow & Forearm

During a clinical evaluation for a suspected distal biceps tendon rupture, the examiner notes considerable bruising but palpates a tendon-like structure in the antecubital fossa that remains taut with passive forearm rotation. However, MRI confirms a complete tear of the distal biceps tendon from the radial tuberosity. Which of the following structures is preventing profound proximal retraction of the muscle belly?

. Lacertus fibrosus (bicipital aponeurosis)
. Brachialis fascia
. Transverse carpal ligament
. Pronator teres aponeurosis
. Brachioradialis fascia

Correct Answer & Explanation

. Lacertus fibrosus (bicipital aponeurosis)

Explanation

An intact lacertus fibrosus (bicipital aponeurosis) can prevent severe proximal retraction of the biceps muscle belly even when the main distal tendon is completely avulsed from the radial tuberosity, sometimes confusing the clinical exam.

Question 460

Topic: Elbow & Forearm

A 45-year-old male undergoes a single-incision anterior repair of a distal biceps tendon rupture. In the recovery room, he is unable to actively extend his thumb and metacarpophalangeal joints, but has intact sensation in his hand and forearm. Which of the following anatomic structures was most likely compressed by a retractor placed on the lateral side of the radial neck?

. Supinator muscle (Arcade of Frohse)
. Pronator teres
. Brachioradialis
. Bicipital aponeurosis
. Ligament of Struthers

Correct Answer & Explanation

. Supinator muscle (Arcade of Frohse)

Explanation

Radial-sided retractors during a single-incision distal biceps repair can compress the posterior interosseous nerve (PIN) as it enters the supinator muscle at the Arcade of Frohse. This results in motor deficits involving finger and thumb extension without sensory loss.

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