Pathomechanics of Knee Joint)

Dr .Manal Radwan Salim

Pathomechanics of kneeA) genu valgum:

The medial epicondyle is enlarged and the lateral condyle is diminished and flattened. Effects of genuvalgum:-The weight bearing line is placed on the outer side of the kneeeffects-strain on meidal collateral ligament.-Osteoarthritis in later stages.

Genu varum: There is deflection in the axis of

tibia in varus and inward in relation to the femurEffects of genuvarum:-The subtalar joint goes into inversion to adapt the sole on the ground-Strain on the lateral collateral ligament-Osteoarthritis in later stages.

For knowledge only

patellectomyIt is a condition of removal of the patella. In this case the patellar tendon lies closer to the center of the tibiofemoral joint than in a normal knee joint so the quadriceps muscle will act with a shorter ever arm, leading to increasing in the force requirements for the muscle.

The quadriceps muscle has to develop more tension (about 30%) than is normally required.So in cases of patellectomy, the patient must be excercised to increase the strength of the quadriceps muscle by about 30% than normal (especially before operation).