Introduction: Osteoarthritis of the knee is a degenerative condition with a variety of treatment options like high tibial osteotomy (HTO), arthroscopic debridement, unicompartmental knee arthroplasty and total knee arthroplasty. This study was conducted with an aim to assess the outcomes of individuals with Grade II and III medial compartment osteoarthritis treated with a proximal fibular osteotomy (PFO) to alleviate discomfort, improve medial joint space and function of the knee joint.