Fig. 6.

Use of a commercial available software (Materialize®) in a revision case of chronic radial head dislocation in the left elbow in a 15-year-old boy. Complaints are loss of flexion and painful loss of prosupination, previous attempt of reduction of the radial head with a ligament sling without corrective osteotomy (so-called Bell Thawse operation). a Preoperative status with anterior superior dislocation of the (already deformed) radial head. In blue the mirrored healthy right side is overprojected over the left elbow. b Osteotomy plan for the opening wedge osteotomy of the ulna. c Simulation of the relocation of the radial head and axis into anatomical position, the radius is still too long and causes impingement on the capitulum. d Simulation of an additional sliding oblique osteotomy of the ulna shaft for acute lengthening of the ulna to allow more relative space for the radial head. A modern olecranon plate is virtualized and bent to simulate the intraoperative situs and sound osteosyntesis