This can lead to cartilage damage. ... Biggest thing for shear force on the knee is the knee doing past the toes, teaches it bad neuromuscular firing patterns and increases likely hood of an ACL tear. George Zafiropoulos. It is not natural to load the knee while the foot travels through space with open-chain movement. Knee extension acts as an unloaded function of the quads. 14th Jun, 2018. The most shearing occured in the final third of a full range of motion during the concentric phase, at the very top of the leg extension. Post by jwcalla » Fri Mar 09, 2007 5:10 pm Thanks guys for all the info. The leg extension is a popular way to train the quadriceps at the front of your knee. The leg extension is a popular way to train the quadriceps at the front of your knee. The aggressive extension of his lead leg builds force under his foot, causing it to pop up and move away from the ball (the opposite direction that he was pushing). [/quote] Shear Force On The Knees The degree of shear force on the knee occurs primarily in the bottom part of the Leg Extension. The leg extension prevents force from the back, destabilizing the knee. Furthermore, because the angle of the leg was measured throughout the movement, it allowed the researchers to study the shearing forces of the limbs. 9. It's appreciated. When you squat, the thickest part of the cartilage is loaded during the squat's maximum force. Thus, by starting from about a 90 range of motion, decreases the shear force on the knees. Unstable knees are more vulnerable to injury from shear stresses as opposed to compressive forces. Close. Never before has this happened. No matter the state of your knees, safely and effectively performing leg extensions relies on good form. But heavy weights and improper form increase your risk of knee injury. That exercise, because if it's very nature (Open-kinetic-chain), puts excessive shear force on the knees. I recently started being very consious not to let my knee go past my toes after watching scott herman on youtube profess this point. this is how I feel as well, the problem is the knee joint is built for compressive force, and the leg extension places shear force on the knee. Unlike squats and lunges, which load the knee primarily with compressive (downward) force, quad extensions apply shear (front-to-back) force. Leg extensions are infamous for being bad for your knees. The leg extension places maximum force on the back of the patella ("knee cap"), the thinnest portion of the cartilage. But heavy weights and … Years ago when I was in school to become an engineer, I wrote a paper on this very subject, and how over time heavy shear force will open up the knee joint up. Now look at Walker. Leg extension also maximize shearing force on knee and patella. Leg extensions place a lot of shear force on the knees. Top. Cite. 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