"Nature runs on logic - the knee is a joint that takes the brunt of body weight, while also requiring lots of mobility. So, the knee has, not only the joint per se, for mobility, but also ligaments around it that make sure the knee only moves within a safe range. One where the joint remains patent, by ensuring the bones involved stay where they are."
"It is similar to a horse tied to a tree - the length at which the rope gets taut forms the maximum distance to which the horse can go. Similarly, the ACL keeps the tibia from moving a little too forward, when the knee extends. Just like the horse example, there is only a certain range to which the knee can move. But, what if our horse pulled with a bit more strength?"
The anterior cruciate ligament (ACL) anchors the femur and tibia, stabilizing the knee by preventing excessive forward movement of the tibia. The knee balances heavy weight-bearing demands with a need for mobility, so surrounding ligaments constrain motion to a safe functional range and maintain joint alignment. The ACL runs in a cruciate fashion between the femur and tibia, providing anterior restraint during extension. Excessive forces, twisting, or extreme stress can injure ligaments; Grade III denotes a full tear. A complete ACL tear removes primary anterior restraint, creating instability and generally necessitating surgical reconstruction.
Read at Bavarian Football Works
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