Locking muscle of Knee joint is: (A) Vastus Lateralis, (B) Vastus Medialis, (C) Vastus Intermedius, (D) Rectus Femoris
Answer is B. 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