![]() ![]() ![]() ![]() A complete tear is also called a rupture. If the force is too strong, the ligaments can tear. When the thumb is straight, the collateral ligaments are tight and stabilize the joint against valgus force. Any hard force on the thumb that pulls the thumb away from the hand (called a valgus force) can cause damage to the ulnar collateral ligaments. The joint that is affected is called the metacarpophalangeal joint, or MCP joint. how the ulnar collateral ligament is injured.This condition is sometimes called gamekeeper's thumb because Scottish gamekeepers commonly injured their thumbs as a result of their job. This strong band of tissue is attached to the middle joint of the thumb, the joint next to the web space of the thumb. Injury to the ulnar collateral ligament of the thumb is fairly common.
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