Nerve & Tendon MCQs

A patient presents with the inability to form a perfect "OK" sign, resulting in a pinch with extended distal interphalangeal (DIP) and interphalangeal (IP) joints. Which nerve is most likely compressed, and which muscle is consequently affected?

The ulnar nerve passes through the cubital tunnel at the elbow. The roof of the cubital tunnel is formed by Osborne's ligament, which anatomically spans between which two structures?

A rock climber presents with pain and a "bowstringing" deformity of the index finger after feeling a pop. Rupture of which of the following annular pulleys is most biomechanically detrimental to normal finger flexion?

Compression of the posterior interosseous nerve (PIN) at the elbow frequently occurs at the Arcade of Frohse. This fibrous arch is formed by the proximal edge of which muscle?

In the surgical treatment of stenosing tenosynovitis (trigger finger), a release of the affected pulley is planned. To prevent bowstringing of the flexor tendons, which adjacent pulley MUST remain intact?

A patient suffers a laceration to the volar forearm, completely transecting the median nerve proximal to the elbow. Which muscle belly of the flexor digitorum profundus (FDP) will primarily lose its innervation?

A 32-year-old patient sustains an isolated penetrating injury to the medial cord of the brachial plexus. Which of the following muscles will demonstrate normal strength on physical examination?

A fracture of the medial epicondyle of the humerus often endangers which nerve?

When treating stenosing tenosynovitis (trigger finger) surgically, the A1 pulley is released. To prevent biomechanical bowstringing of the flexor tendons, which two pulleys of the finger must remain intact?

When performing a volar (Henry) approach to the proximal radius, which structure must be carefully identified and ligated to safely retract the brachioradialis laterally and the pronator teres medially?

A patient presents with an inability to flex the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. Which nerve is most likely compressed or injured?

While performing an in situ decompression of the ulnar nerve at the elbow, the surgeon releases the aponeurosis connecting the two heads of the flexor carpi ulnaris (FCU). This aponeurotic band is classically known as:

A 13-year-old gymnast sustains a fall and presents with an elbow dislocation.

Following closed reduction, radiographs reveal an associated medial epicondyle fracture. Which of the following is an absolute indication for operative fixation of the medial epicondyle?

A 12-year-old boy presents with an acute elbow dislocation. After closed reduction, radiographs reveal a medial epicondyle fracture fragment incarcerated within the joint. Which nerve is most at risk of injury or entrapment in this scenario?

During a volar approach to the forearm for plating a radius fracture, the surgeon must be cautious of the anterior interosseous nerve (AIN). Which of the following muscles is innervated by the AIN?

An anterior single-incision approach to distal biceps tendon repair places which of the following nerves at greatest risk of iatrogenic injury?

A surgeon is performing a single-incision anterior approach to repair an acute distal biceps tendon rupture. Which of the following nerves is at the greatest risk of iatrogenic injury during this specific approach?

A 60-year-old mechanic presents with intrinsic muscle wasting of the hand, a positive Froment sign, and numbness in the small and ulnar half of the ring fingers. He is diagnosed with severe cubital tunnel syndrome. Which structure typically forms the anatomical roof of the cubital tunnel?

During a carpal tunnel release, the surgeon encounters an aberrant transligamentous recurrent motor branch of the median nerve (Lanz variation) and inadvertently injures it. Weakness in which of the following muscles will most likely be observed?