has part has part has_part characteristic of has modifier abnormal olecranon morphology absent olecranon 2018-10-10T10:39:39Z MPheno.ontology missing 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 absent olecranon process of ulna MP:0030857 absent ulnar process absent elbow bony tip abnormal absent olecranon