Multiple choice

Five ligaments are supposed to be most important in stabilizing the thumb. The ligament responsible for abduction, extension, and pronation of the thumb is _______.

  1. anterior oblique ligament

  2. ulnar collateral ligament

  3. first intermetacarpal ligament

  4. dorsoradial ligament

  5. Posterior oblique ligment

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An extracapsular ligament has its origin on the flexor retinaculum and is inserted on the ulnopalmar tubercle of the first metacarpal. It is taut in abduction, extension and pronation and often found elongated in connection to CMC joint arthritis.