Here's what I have done with the V4 Skeleton to meet my expectations of anatomical correctness (though I even went so far as to animate the origins of V4's shins according to how far the knee is bent [the human knee geometry maintains the length of the cruciate ligaments throughout the bend, with the cartilage surface curves reducing their radius the further the knee is flexed])

Apart from protecting the anterior joint surfaces, the patella also protects its tendons from wear against the femur and tibia by holding them away from moving parts.

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My ShareCG Stuff

Verbosity: Profusely promulgating Graham's number epics of complete and utter verbiage by the metric monkey barrel.