Intro The largest synovial joint of the body. Composed of 3 bones : - femur - tibia - patella 2 articulations : - tibiofemoral - patellofemoral
Tibio femoral joint Between the distal end of the femur and the proximal end of the tibia
Patella femoral joint Between the posterior aspect of the patella and the anterior intercondylar surface of the femur
Type It is a compound synovial joint Tibiofemoral – synovial hinge types of joint Patellofemoral – synovial plane types of joint
Q angle It is an angle formed by two intersecting lines : - anterior superior illiac spine ( ASIS ) mid patella - tibial tubercle mid patella 10° - 15° in male 10° - 19° in female Increase of the angle causes the Genu Valgum ( knock knee ) Decrease of the angle causes the Genu
Capsule It is attached to the margins of the articular surfaces and covering the joint. Covering the joints and contains a lubricating fluid,called the synovial fluid.
Meniscus C- shaped sheets of fibrocartilage. The superior surface is in contact with the femoral condyles. Inferior surface is in contact with the tibial condyles. Serves as cushion to the bones & increase the stability of the joint. Prevent the bones to rub at each other while doing activities and producing a cracking sound Rubbing of the bones could lead to Osteoarthritis and other joint disease.