Unicompartmental knee arthroplasty is also known as a partial knee replacement. During the procedure, bone and cartilage that has been damaged is removed and replaced with metal and plastic materials. The procedure is generally recommended for patients who suffer from an injury or disease that affects just one area of the knee, rather than the entire knee.

During the procedure Dr Marais will do an arthroscopy to evaluate the condition of the knee. If he finds the disease to affect only one part of the knee, he will do an unicompartmental replacement. This is done using a small incision and removing the cartilage from the affected parts of the bone. These implants work by recreating a surface of the joint and held in place with a special surgical cement.

Before undergoing a unicompartmental arthroplasty, Dr Marais will will do a physical examination. He may do stress X-rays as well as a MRI to ensure that you are a suitable candidate for the procedure.

After surgery Dr Marais will advise you on the best rehabilitation plan which may include physiotherapy and some lifestyle changes.


We provide an orthopaedic service dedicated exclusively to the problems of the knee. This covers the whole spectrum of knee problems ranging from paediatric to geriatric knee problems. Our practice will take a personal approach to your problem if you have specific needs in mind.


Room 6, Orthopaedic Institute
Cnr Paul Kruger Street & Hibiscus Way
Durbanville, Cape Town, 7550

Tel: 021 975 2686