7. Hand and Wrist MCQs

During a carpal tunnel release, caution is required to avoid injuring the recurrent motor branch of the median nerve. In the majority of individuals, what is the anatomical relationship of this branch to the transverse carpal ligament?

Vascular supply to the hand is provided by an extensive anastomotic network. The superficial palmar arch is primarily formed by the direct continuation of which vessel?

During a surgical exploration for radial tunnel syndrome, the surgeon identifies the most common site of compression of the posterior interosseous nerve. This structure is a fibrous band at the proximal edge of which of the following muscles?

A deep laceration to the hypothenar eminence severs the deep branch of the ulnar nerve. Assuming isolated injury to this branch, which of the following intrinsic hand muscles would most likely retain normal function?

A 45-year-old cyclist presents with numbness in the little finger and weakness of the intrinsic hand muscles. Compression of the ulnar nerve is suspected in Guyon's canal. Which structure forms the floor of this canal?

The recurrent motor branch of the median nerve innervates the thenar musculature. What is the most common anatomical relationship of this branch to the transverse carpal ligament?

During a volar forearm fasciotomy for compartment syndrome, the distal skin incision is deliberately directed ulnar to the palmaris longus tendon at the wrist crease. This maneuver primarily avoids injury to which of the following structures?

During a trigger finger release, excessive division of the flexor sheath can lead to bowstringing of the flexor tendons. Which of the following pulleys is most critical to preserve to prevent this complication?

When performing an ulnar nerve transposition at the elbow, the surgeon must release all potential sites of compression. Which of the following represents the most proximal potential site of ulnar nerve compression?

Following surgical fixation of a proximal radius fracture, a patient cannot extend the interphalangeal joint of the thumb or the metacarpophalangeal joints of the fingers, but sensation is intact. Which nerve is injured, and through which muscle does it pass?

A 34-year-old avid cyclist reports progressive numbness in his ring and small fingers along with weakness in finger abduction. Suspecting compression at Guyon's canal, surgical release is planned. Which structure forms the floor of this anatomical canal?

A hand surgeon is repairing a flexor tendon laceration in Zone II of the index finger. Which of the following best describes the anatomical relationship of the flexor tendons within this specific zone?

During an anterior subcutaneous transposition of the ulnar nerve, the nerve is released from the cubital tunnel. What anatomical structure forms the roof of the cubital tunnel?

A patient presents with the inability to form an "OK" sign, demonstrating an extended distal interphalangeal joint of the index finger and interphalangeal joint of the thumb during pinch. Sensation in the hand is completely normal. What is the most likely diagnosis?

Six weeks after undergoing volar plating for a distal radius fracture, a patient notes a sudden inability to actively extend the interphalangeal joint of the thumb. The tendon most likely ruptured wraps around which bony prominence?

A 6-year-old boy presents with an established nonunion of a lateral humeral condyle fracture sustained 2 years ago.

He demonstrates a progressive cubitus valgus deformity. Which of the following neurologic complications is most strongly associated with this condition?

A 6-year-old child sustains a displaced lateral condyle fracture of the humerus that is missed and not treated operatively. If this progresses to a nonunion, which of the following long-term complications is most likely to develop years later?