A, Portals are marked for arthroscopy with patient prone. Laterally, anterior midlateral and anterior proximal lateral portals are marked. Direct lateral portal also is indicated just posterior to outline of radiocapitellar joint. Medially, ulnar nerve and medial epicondyle are carefully marked. Flexor crease of elbow is noted. Proximal medial portal is made 2 cm proximal to epicondyle. Direct posterior and posterolateral portals are 2.5 to 3 cm proximal to tip of olecranon with elbow in 30 degrees of flexion and patient supine. B, Operating room setup for elbow arthroscopy with patient prone.