The coronoid fossa is the concavity on the anterior surface of the distal humerus that accommodates the coronoid process of the ulna during full elbow flexion. It is part of the anterior distal humerus and allows the coronoid process to engage smoothly during maximum flexion without impingement.
The coronoid fossa is deepened by hypertrophied coronoid tips and osteophytes in elbow osteoarthritis, producing a block to full flexion. Arthroscopic coronoid fossa debridement is a component of elbow stiffness release. The fossa may contain loose bodies visible on lateral elbow X-ray as anterior joint space opacities. Its depth and shape determine the maximum achievable elbow flexion angle.
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