Assertion: knee's joint | /r/MadeOf | the top of the tibia
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Source sentences:
text: The knee is actually one of the most complex joints in the body, particularly as it includes two different joints in one—the patellofemoral joint, between the kneecap and the thigh or femur, and the tibiofemoral joint formed by the lower end of the femur and the top of the tibia, or shin bone.