In open-chain knee motion, which bone primarily moves relative to the other?

In open-chain knee motion, which bone primarily moves relative to the other?

• A. Tibia
• B. Patella
• C. Femur
• D. Fibula

Answer: (A)

In open-chain knee motion, the distal segment is free to move while the thigh is relatively stabilized. The tibia moves on the femur, with its condyles sliding and rolling across the femoral condyles as you bend or straighten the knee. The femur tends to stay more fixed due to proximal stabilization from the hip and thigh muscles, so the tibia is the primary moving bone. This contrasts with closed-chain movements, where the femur moves on a relatively fixed tibia as the body moves.

In open-chain knee motion, the distal segment is free to move while the thigh is relatively stabilized. The tibia moves on the femur, with its condyles sliding and rolling across the femoral condyles as you bend or straighten the knee. The femur tends to stay more fixed due to proximal stabilization from the hip and thigh muscles, so the tibia is the primary moving bone. This contrasts with closed-chain movements, where the femur moves on a relatively fixed tibia as the body moves.