Figure 5.

Measurement of the radiocapitellar joint space. Using a line parallel to the lateral border of the radial head (line A) as a reference, we defined the radiocapitellar joint space as the distance between a line perpendicular to A crossing the proximal edge of the radial head (line B) and a line parallel to B crossing the distal edge of capitellum (line C). This measurement was performed for each experimental condition tested: intact (stage 0), release of the anterior one-third of the lateral collateral ligament–capsular complex (stage 1), release of the anterior two-thirds (stage 2), and release of the entire complex (stage 3). Cap, capitellum; RH, radial head.