Fig. 4.

The photograph shows the computer-generated custom jig applied and secured with Steinmann pins to a cadaveric specimen. Because the jig was designed specifically to conform to one particular location on the distal femur, the surgeon could place the jig in the correct position by allowing it to key in to its appropriate location on the bone. To provide an additional visual clue to ensure its correct positioning, we designed the jig so that the shape of its distal surface corresponded to the proximal ridge of the articular cartilage.