If only one compartment of the knee is osteoarthritic (most often the inside or medial compartment) you may be a candidate for a unicompartment knee replacement. This is effectively a partial knee replacement of the arthritic compartment of the knee.
To be a suitable candidate the bowed leg deformity has to be correctable and the anterior cruciate ligament of the knee (has to be intact.) Replace with “is preferred to be intact” You should be able to almost fully straighten your knee and you should not have any inflammatory condition of the knee. (for example, rheumatoid arthritis).