Twenty-one fresh cadaver wrists were studied by arthrography and arthrotomography. Arthrography was unreliable in accurately delineating the palmar radiocarpal ligaments. However, lateral arthrotomograms predictively and precisely outlined the radiolucent radiocapitate and radiotriquetral ligaments. The radial and more distant radiolucent area was the radiocapitate ligament, and the ulnar and more proximal area was the radiotriquetral ligament. A constant radiopaque invagination between the outlines of contrast material demonstrated the sulcus anatomically separating these two ligaments. When the ligaments were transected contrast material entered the substance of the ligaments, rendering them radiopaque and, thus, visible on the radiographs. The authors believe that arthrotomography may be a useful clinical tool in the evaluation of post-traumatic injuries to the palmar radiocarpal ligaments of the wrist.