Why is the knee joint so prone to injury?

Situated between the two longest bones in your body (the tibia and fibula), the classic door-hinge knee joint bends in one plane of motion-backward, not forward or side to side. It's at risk for strain and injury because of its limited range of motion, the heavy load your knees carry, and the torque (from twisting motions) generated by the two lever-like bones. While you may hear about knee injuries most commonly in the form of professional athletes who tear their ACLs (anterior cruciate ligaments), the more common knee injury for those of us who do and don't play with pigskin is actually a meniscus tear.

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