High-grade Common Extensor Tendon Tears Maintaining Chronic Lateral Epicondylitis: Clinical and Structural Outcome Following Knotless Suture Anchor Repair

We describe the reconstruction of high-grade extensor tendon tears using a knotless suture anchor and hypothesize that this will result in improved elbow pain and function with a high healing rate. Twenty chronic lateral epicondylitis patients with magnetic resonance imaging–confirmed high-grade extensor tendon tears underwent surgery using a knotless suture anchor technique. All underwent clinical and ultrasound assessments and completed the quick Disabilities of the Arm, Shoulder, and Hand and patient-rated tennis elbow evaluation questionnaires at final follow-up. Preoperative and postoperative Mayo Elbow Performance Scores were also determined. Mean patient age at surgery was 48 years with 11 women and 7 men available at final follow-up. Diagnostic arthroscopy was performed for all patients before repair; cartilage lesions were found in 8 patients. Mayo Elbow Performance Score improved from 55 to 100 points. At final follow-up, the median grip strength was 100% (range, 52 to 114) of the nonaffected side and patient-rated scores were almost 0. We did not observe any retears. Some tennis elbow patients may present with high-grade tears that contribute to chronic symptoms. Our repair technique resulted in a satisfactory outcome for these patients and may reduce the risk of secondary posterolateral instability following complete tendon release.