Partial Knee Replacement
The knee can be considered as having three compartments: the inner side (medial compartment), the outer side (lateral compartment) and the knee-cap articulation (patello-femoral compartment). If only one compartment is worn and if the conditions are right it is possible to replace only the single worn compartment and not the entire knee.
The most commonly worn single compartment of the knee is the medial (or inner) side of the knee. The most widely used partial replacement implant for treatment of this compartment is the Oxford unicompartmental replacement (click to view the website for this implant).
In these x-rays (a front-on and side-on view of the same knee) the inner (medial) part of the knee alone has been replaced.
It is also possible to replace only the outer side (lateral compartment) or only the knee-cap joint (patella-femoral joint).
In these x-rays only the knee cap has been replaced.