In some patients we observe an oblique joint line (i.e. in cases of a femoral valgus which is compensated by a tibial varus deformity) even though the overall alignment of the affected leg is straight. Does anybody know papers on the biomechanical influence of an oblique joint line in such patients ?
The situation is different when the radiograph is performed with loading or not. What is your case, loaded or not ? Lateral view is necessary too. Full leg radiograph is also needed to assess the neighbouring joints and their orientation. Anyway, oblique joint line leads to increase of sliding forces which is a serious deviation from the normal biomechanics of the joint and causes instability, overloading and degenerative changes. Gonarthrosis will be the result.
Panayot is right here: if the femur is valgus and the tibia varus the ligaments and cartilage in the medial compartment of the knee are overloaded under weight and that destined for alteration.
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