Fig. 1
From: Torque-producing capacity is affected by moment arm in the human knee extensors
Representative magnetic resonance imaging scans of mid-thigh quadriceps femoris cross-sectional area and knee extensor moment arm. The quadriceps femoris cross-sectional area included the rectus femoris (RF), vastus intermedius (VI), vastus lateralis (VL), and vastus medialis (VM). The quadriceps femoris muscle volume was calculated by multiplying the sum of the cross-sectional areas along their length at intervals of 10 mm. The knee extensor moment arm was calculated as the distance between the tibio-femoral contact point and the mid-line of the patellar tendon