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Percent breakdown of subjects (n = 37) with effective stress most sensitive to individual quadriceps muscle forces in the (A) femur and (B) patella cartilage. There was no subject whose femur cartilage effective stress was most sensitive to variation in rectus femoris or vastus intermedius muscle forces (A), and there was no subject whose patella cartilage effective stress was most sensitive to variation in rectus femoris muscle forces (B).
