A Rare Intra-articular Abnormality in the Posterior Radiocapitellar Joint: A Case Report

INTRODUCTION: Posterior radiocapitellar synovial plica excision is sometimes performed for lateral epicondylitis after debridement of the extensor carpi radialis brevis (ECRB) tendon. We describe a rare intra-articular abnormality of the posterior radiocapitellar joint diagnosed on posterior arthroscopic observation. CASE REPORT: A 48-year-old man presented with posterolateral pain and discomfort in his left elbow. A diagnosis of lateral epicondylitis was made, and arthroscopic debridement of the ECRB tendon was performed. Posterior arthroscopic examination revealed a tendon-like abnormality running longitudinally along the articular surface of the capitulum of the humerus. The abnormality was resected using a shaver, and symptoms improved postoperatively. CONCLUSION: In patients with posterolateral pain and discomfort or catching of the elbow, posterior arthroscopic confirmation of the intra-articular structure is recommended after debridement of the ECRB tendon.