798084.fig.001a
(a)
798084.fig.001b
(b)
Figure 1: Schematic drawing of the impingement of the coronoid process and the olecranon tip in the anterior and posterior humeral fossae in case of early cubarthritis with the formation of osteophytes which impinge in maximal flexion and extension of the joint (a). This is resolved by a decompressing effect after trepanation of the distal humerus (b).