7. Hand and Wrist MCQs

During ligamentous reconstruction for early basilar thumb arthritis, the anterior oblique ligament (beak ligament) is targeted to restore stability against dorsal subluxation. Where is the primary metacarpal attachment site of this ligament?

When performing an endoscopic carpal tunnel release, the surgeon must stay radial to the hook of the hamate to avoid entering Guyon's canal. Which structures form the anatomic roof of Guyon's canal?

A 22-year-old athlete sustains a scaphoid waist fracture. What is the primary source of the retrograde blood supply to the proximal pole of the scaphoid?

A 35-year-old typist complains of proximal anterior forearm pain and paresthesias in the radial three-and-a-half digits. Examination shows reproduction of symptoms with resisted forearm pronation and elbow flexion. Compression of the median nerve by the lacertus fibrosus is suspected. From which muscle does the lacertus fibrosus originate?

A patient suffers an isolated ulnar nerve injury at the wrist. Which of the following intrinsic hand muscles will lose its innervation?

A 31-year-old mechanic complains of an inability to extend his digits at the metacarpophalangeal joints. Examination reveals intact wrist extension with radial deviation, and no sensory deficits. The diagnosis of Posterior Interosseous Nerve (PIN) syndrome is confirmed. The most common site of compression is the Arcade of Frohse, which is formed by the tendinous proximal border of which muscle?

A rock climber presents with acute bowstringing of the index finger flexor tendons following a sudden forceful grip. This condition typically results from rupture of the A2 and A4 pulleys. To what specific structures do these critical pulleys attach?

A cyclist complains of persistent numbness in the ring and small fingers along with weakness in finger abduction. Compression of a nerve within Guyon's canal is suspected. Which of the following structures forms the floor of this anatomic canal?

A patient presents with an inability to actively extend the fingers and thumb, but wrist extension is preserved with radial deviation. Posterior interosseous nerve (PIN) syndrome is suspected. What is the most common site of compression for this nerve?

During a dorsal approach to the wrist, the surgeon uses Lister's tubercle as a landmark. The tendon that passes immediately adjacent and ulnar to this structure is innervated by which of the following nerves?

In cases of thumb carpometacarpal (CMC) joint arthritis, progressive attenuation of the primary static stabilizing ligament is often noted. From which anatomical structure does this critical ligament, the anterior oblique ligament (beak ligament), originate?

Which of the following describes the most common configuration of a Martin-Gruber anastomosis?

The primary blood supply to the proximal pole of the scaphoid is derived from vessels entering at which anatomical location?

During trigger finger release of the ring finger, the A1 pulley is transected. Which pulleys are considered mechanically critical to prevent bowstringing of the flexor tendons and must be preserved?

Wartenberg's syndrome is characterized by pain and paresthesias over the dorsoradial hand. It is typically caused by compression of the superficial radial nerve between which two muscles during forearm pronation?

A 45-year-old mechanic presents with weakness in extending his fingers and thumb, but normal wrist extension. Which of the following anatomical structures is the most common site of entrapment for the affected nerve?

A cyclist presents with numbness in the ring and small fingers along with weakness in finger abduction and adduction. Sensory examination reveals normal sensation over the dorso-ulnar aspect of the hand. Where is the most likely site of compression?

The central band of the interosseous membrane is critical for longitudinal radioulnar stability, particularly after a radial head excision. What is the anatomical orientation of the central band fibers?

A patient presents with a severe palmar laceration resulting in the loss of extension at the proximal and distal interphalangeal joints of the index and middle fingers. The lumbrical muscles to these specific digits are uniquely characterized by which of the following features?

A 22-year-old male sustains a minimally displaced scaphoid waist fracture. Which of the following best describes the primary arterial supply jeopardized by this injury, predisposing him to avascular necrosis of the proximal pole?