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Ligaments of the Thumb CMC:
1. Beak ligament (anterior oblique)
- Major stabilizing factor for the 1st CMC joint
- Interconnects the palmar tubercle (beak) of the metacarpal base and the distal part of a ridge on the tubercle of the trapezium
- Tight in abduction, extension, and opposition
2. Ulnar collateral ligament
- Volar and medial aspects of the CMC joint
- Extends from the transverse carpal ligament to the palmar-medial base of 1st metacarpal
Collateral Ligaments
Stabilize the MCP joint, PIP joint, and DIP joint
What is the most common ligament injured in the thumb?
Ulnar collateral ligament
