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The medial femoral condyle is longer than the lateral one. As the knee approaches full extension, this asymmetry forces the tibia to externally rotate just enough to tighten the cruciate ligaments and lock the joint. The mechanism is called the screw-home, and it is the reason you can stand for hours without your knees being a continuous active stabilization problem. It is a feature, not a bug.
Modern training culture tends to read this design as a limitation — something to “open” or “free up” or “improve.” It is not a limitation. It is a piece of inherited engineering that protects the joint everywhere except inside the rotation window, where rotation is actually needed.
🔩 Built-In Wisdom
The full knee Tech Support respects the screw-home and trains rotation only where it is available — between roughly thirty and one hundred and ten degrees of flexion. Outside that window, the joint is locked, and the practice should let it stay locked. There is nothing to condition there. Only things to protect.
🪷 Respect the Design
A useful Sanskrit word here is prakṛti — nature, the given material. Yoga is sometimes mistaken for a project of overriding prakṛti. It is more accurate to say that yoga is the project of working with prakṛti — knowing what the body has been built to do, training what is conditionable, leaving what is protective intact. The screw-home is prakṛti at the knee. Listen to it.
— MJH