Outcomes of Surgery for Medial Arthrosis

The knee is comprised of three articular compartments, and of these the medial compartment is most frequently affected by isolated arthrosis. This can be attributed to 60–70% of weight-bearing load being transmitted through the medial compartment in a normally aligned knee and varus being the most common malalignment [1]. There is a greater incidence of injury to medial structures, with a higher rate of both chondral and meniscal trauma when compared to the lateral side [2]. Chondral injuries have the potential to progress, and a meniscal injury causes disruption to its intrinsic hoop stresses important for load distribution and protection of the joint [3]. Varus malalignment can be accentuated by medial compartment cartilage wear, further increasing the load distribution medially and accelerating osteoarthritis (OA).