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lecture 3_1-1 - Knee Joint and Legs Joints Knee Two...

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Unformatted text preview: Knee Joint and Legs Joints: Knee Two articulations: Hinge joint: femur-tibia Gliding joint: patellafemur Flexion/extension Some rotation Menisci Medial/Lateral meniscus Fibrocartilage discs Function: match articular surfaces Shock absorbing Joint stability Ligaments: Knee stability Extracapsular Paterllar Medial collateral Lateral collateral Ligaments Intracapsular Anterior cruciate Weaker Prevents hyperextension Prevents anterior displacements Posterior cruciate Stronger Prevents hyperflexion Prevents posterior displacement Ligaments Intracapsular Anterior cruciate Weaker Prevents hyperextension Prevents anterior displacement (tibial) P Ant A Ant Posterior cruciate Stronger Prevents hyperflexion Prevents posterior displacement (tibial) P A Joints: Tibiofibular Proximal tibiofibular joint: Synovial (gliding) Relatively immobile Distal tibiofibular joint: Syndesmosis (fibrous joint) Critical to ankle stability Interosseous membrane Muscles acting on the Knee Extensors Quadriceps group Flexors Hamstring group Gastrocnemius Rotators Popliteus Tibia (medially) when seated Femur (laterally) when standing Clinical Stability depends on ligaments and muscles Meniscus injury twisting strain during flexion ACL/PCL ruptures = anterior and posterior displacements accompanied by ligament damage ...
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