Trochlear

The two trochlears decussate in the anterior medullary velum.

At 90° of flexion, the patella enters the condylar fossa, where the contact areas are on both the lateral and medial trochlears of the femur.

Using three-dimensional printing, they replaced the native trochlear in four cadaveric knees with dysplastic trochlears and then subjected them to squat simulation, open chain extension, and a patella stability test.