Elbow Instability and Ligament Injuries
Elbow stability depends on the precise shape of the bones, the lateral and medial collateral ligaments, and the muscles that cross the joint.
Types of recurrent elbow instability
Posterolateral rotatory instability is the most common chronic pattern and results from insufficiency of the lateral ulnar collateral ligament. Patients may feel the elbow shift, click, or give way when pushing up from a chair, performing a push-up, or loading the arm in certain positions. Valgus instability involves the medial UCL and is most familiar in throwing athletes. Varus posteromedial instability combines lateral ligament injury with a coronoid fracture or deficiency and can rapidly damage the joint if not recognized. Complex patterns can follow fracture-dislocation, multiple operations, or chronic deformity.
Evaluation
The history focuses on the original injury, dislocations, recurrent slipping, prior injections or surgery, and the positions that provoke symptoms. Examination assesses the lateral and medial ligaments, rotatory instability, range of motion, strength, ulnar nerve function, and generalized laxity. X-rays evaluate alignment, arthritis, fractures, and prior hardware. Stress imaging, dynamic ultrasound, or fluoroscopy can demonstrate instability in selected cases. MRI evaluates ligaments and associated soft tissues. CT is used when fracture, coronoid deficiency, malunion, or other bone abnormality contributes.
Nonsurgical treatment
Selected mild or acute injuries may improve with temporary protection, bracing, activity modification, and therapy focused on dynamic muscular stabilization. Throwing-related valgus symptoms require a workload and kinetic-chain assessment. Persistent mechanical instability, recurrent dislocation, or inability to perform daily or athletic tasks often indicates that the structural stabilizers are insufficient.
Surgical treatment
Acute ligament avulsions with healthy tissue may be repaired. Chronic or poor-quality injuries often require reconstruction with a tendon graft. Lateral ulnar collateral ligament reconstruction is commonly used for recurrent posterolateral rotatory instability. Medial UCL repair or reconstruction is chosen according to tissue quality and athletic demands. When bone deficiency, malunion, nonunion, or coronoid loss contributes, ligament surgery alone may fail. The reconstruction may also need fracture fixation, bone grafting, osteotomy, radial head treatment, or another stabilizing procedure.
Recovery and limitations
The elbow is protected in a brace while motion is restored through a safe arc. Strengthening and return to loading progress after the repaired or reconstructed ligament has healed. Throwing and heavy pushing require a sport- or work-specific progression. Potential risks include recurrent instability, stiffness, nerve injury, heterotopic bone, persistent pain, graft failure, arthritis, and additional surgery.
This information is educational and is not a substitute for an individualized medical evaluation. Written and medically reviewed by Michael L. Knudsen, MD | Last reviewed: July 2026
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