Joint Capsule of Elbow Joint

The fibrous layer of the joint capsule surrounds the elbow joint. It is attached to the humerus at the margins of the lateral and medial ends of the articular surfaces of the capitulum and trochlea. Anteriorly and posteriorly, it is carried superiorly, proximal to the coronoid and olecranon fossae.

The synovial membrane lines the internal surface of the fibrous layer of the capsule and the intracapsular non-articular parts of the humerus. It is also continuous inferiorly with the synovial membrane of the proximal radio-ulnar joint. The joint capsule is weak anteriorly and posteriorly but is strengthened on each side by collateral ligaments.