Anatomical Differences between Locking and Unlocking the Knee Joint

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The locking and unlocking of the knee joint is primarily facilitated by the screw home mechanism. Here are the anatomical differences: • Locking the Knee Joint • Medial Rotation of the Femur: During the last 30 degrees of knee extension, the femur rotates medially on the tibia. • Tibial Rotation: In an open kinetic chain (when the foot is not fixed), the tibia laterally rotates on the femur to achieve full extension. • Closed Pack Position: This rotation keeps the knee in a stable, closed pack position. • Unlocking the Knee Joint • Lateral Rotation of the Femur: To unlock the knee, the femur rotates laterally on the tibia. • Tibial Rotation: In a closed kinetic chain (when the foot is fixed), the tibia medially rotates on the femur to allow flexion. • This mechanism is essential for providing stability to the knee during weight-bearing activities and ensuring smooth movement during walking and other activities. • Would you like to know more about the clinical significance of this mechanism or any related conditions? • #Kneejoint

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