The Thumb UCL test assesses stability of which structure?

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Multiple Choice

The Thumb UCL test assesses stability of which structure?

Explanation:
The Thumb UCL test is about the ulnar collateral ligament of the thumb at the metacarpophalangeal joint. This ligament’s job is to stabilize the thumb when it is stressed in a direction that would push it away from the hand (valgus stress) and limit abduction of the distal thumb. When you perform the test, you apply a valgus force to the MCP joint with the thumb in slight flexion. If there is laxity or pain, it suggests a tear or injury to the ulnar collateral ligament, which compromises thumb stability. This is distinct from stability tests for the wrist structures like the TFCC, scapholunate ligaments, or radiocarpal joint, which involve different joints and testing maneuvers.

The Thumb UCL test is about the ulnar collateral ligament of the thumb at the metacarpophalangeal joint. This ligament’s job is to stabilize the thumb when it is stressed in a direction that would push it away from the hand (valgus stress) and limit abduction of the distal thumb. When you perform the test, you apply a valgus force to the MCP joint with the thumb in slight flexion. If there is laxity or pain, it suggests a tear or injury to the ulnar collateral ligament, which compromises thumb stability. This is distinct from stability tests for the wrist structures like the TFCC, scapholunate ligaments, or radiocarpal joint, which involve different joints and testing maneuvers.

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