has part has part has_part characteristic of has modifier abnormal olecranon morphology small olecranon 2018-10-10T10:42:34Z reduced olecranon size small olecranon process of ulna reduced olecranon process size reduction of the large bony prominence at the proximal end of the ulna which articulates with the olecranon fossa of the humerus and is palpable at the posterior aspect of the elbow reduced ulnar process MPheno.ontology decreased olecranon size MP:0030858 small elbow bony tip abnormal decreased size olecranon