Fig. 3
From: 3D analysis of the distal ulna with regard to the design of a new ulnar head prosthesis
Top left: The shaft cylinder is fitted into the surface reconstructed ulna, also seeing the inner part when the bone is set as translucent. Bottom left: The head cylinder is always parallel positioned and is fitted to barely cover the ulnar hear. Right: Best fit of the ulnar head cylinder shows non-congruence with the medial ulnar wall (red arrow). This leads to difference in value of the head size and offset compared to previous analyzes