College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What ligament is stressed during the "Skier's Thumb" test?

Radial Collateral Ligament
Medial Collateral Ligament
Ulnar Collateral Ligament
Tendon of the Flexor Pollicis

The correct answer is: Ulnar Collateral Ligament

The Ulnar Collateral Ligament (UCL) is specifically stressed during the "Skier's Thumb" test. This injury typically occurs when there is a forceful abduction of the thumb, which can happen during activities like skiing when the ski pole pulls on the thumb. The UCL, which stabilizes the metacarpophalangeal (MCP) joint of the thumb, is responsible for maintaining this stability. When the ligament is overstretched or torn, it can lead to pain, swelling, and instability at the thumb joint, which is assessed during the test. Injury or stress to the UCL can significantly affect the function of the thumb, making it difficult to grip effectively, which is crucial for a variety of daily activities and sports. This is why the identification of UCL stress during the test is clinically relevant for determining the extent of the injury and guiding treatment.