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Medial patello-femoral ligament

The medial patello-femoral ligament is a small but important ligament stretching from the inner aspect of the patella (knee cap) to the femur bone.

It acts as a passive restraint, helping to keep the patella properly aligned. It has an anatomical relationship, too, with the important VMO muscle (part of the quadriceps), and tearing the medial patello-femoral ligament makes the VMO incompetent.