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Ulnar Collateral Ligament (UCL) Tear

What Is the UCL?

The ulnar collateral ligament (UCL) is a key stabilizing ligament on the inner (medial) side of the elbow. It connects the humerus (upper arm bone) to the ulna (inner forearm bone) and helps resist valgus stress — a force that pushes the forearm away from the body. This ligament is especially vital in overhead throwing sports like baseball, javelin, and softball, where high stress is repeatedly placed on the inner elbow.

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What Is a UCL Tear?

A UCL tear occurs when the ligament is stretched or torn due to repetitive stress or a traumatic injury. In athletes, this is typically caused by the repetitive acceleration and deceleration phases of throwing, which strain the ligament over time. UCL tears range from minor sprains to complete ruptures, and may occur suddenly (acute) or gradually (chronic).

Causes and Risk Factors

  • Repetitive overhead throwing (pitching, javelin)
  • Poor throwing mechanics
  • Inadequate warm-up or muscle imbalance
  • Sudden increase in throwing workload or velocity
  • Previous elbow injuries

Symptoms of a UCL Tear

  • Pain on the inner side of the elbow, especially during or after throwing
  • A popping sensation at the moment of injury (in acute tears)
  • Loss of velocity or accuracy in throws
  • Swelling and tenderness along the inner elbow
  • Elbow instability or looseness during motion
  • Inability to continue throwing

Treatment Options

Non-Surgical (Conservative) Treatment

Recommended for partial tears or non-athletes:

  • Rest and activity modification
  • Ice and anti-inflammatory medication
  • Physical therapy focusing on forearm, shoulder, and core strength
  • Biomechanical correction (throwing technique)
  • PRP (platelet-rich plasma) injections in some cases

Surgical Treatment – Tommy John Surgery

For complete tears or high-level athletes:

  • UCL reconstruction using a tendon graft (often from the forearm or hamstring)
  • Performed with small incisions and sometimes assisted by internal bracing
  • Rehabilitation begins shortly after surgery

Recovery Timeline

Non-surgical rehab:

3–6 months depending on severity

Tommy John surgery:

Return to throwing: 4–6 months
Return to full competition: 9–12 months, sometimes longer

Return to Sport

The majority of athletes who undergo UCL reconstruction can return to their previous level of play — often with improved performance — when rehabilitation protocols are followed precisely.

UCL Expertise at Kerlan Jobe Institute

The specialists at Kerlan Jobe Institute are pioneers in the diagnosis, treatment, and surgical reconstruction of UCL injuries. Whether you’re an elite pitcher or a weekend athlete, our team delivers customized treatment plans that prioritize both recovery and long-term elbow health.

Getting You Back in Motion

Surgery is just the beginning. How do you heal, move, and feel when all is said and done?
  From NHL and NBA players to weekend warriors, our goal is the same: getting you back to doing what you love.  


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Kerlan-Jobe provides comprehensive orthopaedic care for patients seeking expert treatment for sports injuries, joint pain, and mobility limitations. We offers specialized experience and a patient-first approach designed to support lasting results.

Contact the office to schedule a consultation and learn more about your treatment options.

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