Thursday, February 16, 2012

Movement and Muscles at the Knee
 internal and external rotation

poppy internally rotates her lower leg at the knee poppy externally rotates her lower leg at the knee

Just to show you, your lower leg slightly rotates at the knee when the knee is flexed. Not going to go into a lot of detail because we don't tend to work this movement a lot. Semimembranosus, semitendinosus, and popliteus do internal rotation, and biceps femoris does external rotation.

Your lower leg does not rotate when it is fully extended, due to the "screw-home mechanism" that locks your femur on the tibia for stability.