Why does the screw home mechanism occur

With this knowledge, the next time you bend or extend your knee, you will appreciate the complexities of the human body and understand that without good form, there is not good function.

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What is Screw Home Rotation? This is due to factors including: The shape of the medial femoral condyle. According to research, the articular surface the end of the bone where two bones join to allow movement on the medial femoral condyle has a 30 degree lateral curve. This curvature allows the tibia and femur to follow this curve with tibial-on-femoral rotation as well as femoral-on-tibial rotation. The quadriceps insert into the tibial tuberosity via the patellar tendon.

When contracted, the quadriceps cause an anterior translation of the tibia on the femur. This creates a passive tension in the anterior cruciate ligament ACL which contributes to external rotation. This passive tension helps stabilize the extended knee by resisting excessive anterior translation of the tibia or excessive posterior translation of the femur.

The importance of form Bottom line: Form is an essential component to low body activity due to factors such as the screw home rotation. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation, 2 nd edition. Louis, MO: Mosby. Rajendron K. Screw-home mechanism.

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Cite this page. During extension when all articular surface of lateral condyle is used by roll movement there are still unused articular surface on medial condyle. Femur glides posteriorly on tibia to use full articular surface of medial condyle. However, the shape of the condyles are not what brings about the movements. Popliteus internally rotates tibia unlocks knee with open chain motions.

Hip external rotation externally rotates femur unlocks knee with closed chain motions. References: 1. Loudon, Robert C. Manske, Michael P.