A healthy young athlete sitting at table with knee at 90 degree flexion. What will happen when he fully extends the knee (AIIMS –May’2010)
|A||Movement of tibial tuberosity towards medial border of patella|
|B||Movement of tibial tuberosity towards lateral border of patella|
|C||Movement of tibial tuberosity towards centre of patella|
|D||No change in relationship|
Physiological Knee locking happens in the last 30° of knee extension and involves the rotation of either bone femur or tibia.
a. It involves medial rotation of femur on tibia if the foot is fixed to the ground (weight bearing leg).
b. If the foot is off the ground (as sitting on a table) then tibia has to rotate opposite (laterally) to lock the knee joint.