UCL Injuries

The ulnar collateral ligament (UCL) of the elbow is the primary stabilizer against valgus stress — the outward force placed on the elbow during overhead throwing. UCL injuries range from sprains and partial tears to complete ruptures, and are most common in baseball pitchers, javelin throwers, and other overhead athletes.

Mechanism and Causes

During the acceleration phase of throwing, enormous valgus stress is placed on the medial elbow. Repetitive throwing can cause cumulative microtrauma and gradual UCL attenuation, or a single pitch can cause an acute complete rupture.

UCL injuries are most prevalent in baseball pitchers, but also occur in quarterbacks, volleyball players, and tennis players. Overuse, poor mechanics, and inadequate rest between outings are contributing factors.

Treatment

Partial UCL tears and sprains in non-throwing athletes are often managed non-surgically with rest, physical therapy, and a structured return-to-throwing program. PRP injection may accelerate healing of partial tears.

Complete UCL tears in throwing athletes who wish to return to competitive throwing typically require UCL reconstruction — the Tommy John procedure. Dr. Kinchelow reconstructs the ligament using a tendon graft, restoring medial elbow stability. Return to competitive throwing takes 12–18 months.

Common Symptoms

Medial elbow pain during or after throwing
Decreased throwing velocity or control
Feeling of giving way in the elbow
Tenderness over the UCL
Ulnar nerve symptoms (numbness in ring/little fingers)
Acute pop with sudden pain (complete rupture)

Treatment Options

Rest and activity modification for partial tears
Physical therapy and return-to-throwing program
PRP injection for partial tears
UCL reconstruction (Tommy John surgery)
Ulnar nerve transposition if indicated
Structured 12–18 month return-to-sport protocol

Ready to Get Help?

Dr. Kinchelow specializes in treating ucl injuries. Schedule a consultation today.

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