Abstract: Abstract: Unicompartmental knee arthroplasty (UKA) is one of the surgical treatments for single-compartment knee osteoarthritis (OA), which can provide symptomatic relief and promote knee function. However, the traditional operation indications of UKA are strict, including requirements of demographic characteristics, knee joint function and radiological measurement. With the development of implant design and surgical technique, the indications and contraindications of UKA keeps are changing. Some contraindications are break through, and the range of indications are expanded. Therefore, the current review focuses on the indications of UKA from the aspects of age, body mass index (BMI), anterior cruciate ligament (ACL) function and patella-femoral joint arthritis (PFO) to provide reference for clinical treatment.

Key words: arthroplasty, replacement, knee, knee osteoarthritis, unicompartmental knee arthroplasty, indications