Locking muscle of Knee joint is
Locking is a mechanism that allows the knee to remain in the position of full extension as in standing without much muscular effoLocking occurs as a result of medial rotation of the femur during the last stage of extension. Vastus medialis prevents lateral displacement of the patella.Reference: Chaurasia Volume II; 7th edition; Page no: 169
Vastus Lateralis
Vastus Medialis
Vastus Intermedius
Rectus Femoris
Lower limb