Injury to the medial ulnar collateral ligament of the elbow can range from minor to major depending on the cause and past history of the player.

NOTE: Injuries of the ulnar collateral ligament at the elbow need to be separated from ulnar collateral ligament at the thumb


The ligament provides valgus stability for the elbow.


Sources of injury:

(1) repetitive overarm movements

(2) blunt trauma


Athletes at risk for injury:

(1) baseball pitchers

(2) contact sports

(3) any other athlete using repetitive overarm/overhead movements


Clinical findings with UCL injury:

(1) elbow pain and swelling

(2) problems with hand grip

(3) paresthesia in the fourth and fifth fingers


The diagnosis is supported by changes in imaging studies (CT. MRI, US).

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