has part has part has_part characteristic of part of has modifier abnormal radius morphology abnormal elbow joint morphology abnormal radius head morphology 2018-10-19T11:18:01Z abnormal head of radius morphology MP:0030882 MPheno.ontology abnormal radial head morphology any structural anomaly of the proximal articular surface of the radius that forms part of the elbow joint and that is palpable on the lateral side of the elbow, immediately distal to the lateral epicondyle of the humerus; the radial head articulates with the ulna at the proximal radioulnar joint and with the humerus at the radiohumeral joint; at the proximal radioulnar joint, the radial head sits in the radial notch of the proximal ulna and is held in place by the annular ligaments; at the radiohumeral joint, the radial head sits adjacent to the capitellum of the humerus abnormal caput radii morphology morphology abnormal head of radius