Partial endoprothesis implantation in a patellofemoral joint is a rare surgical procedure not only in our country, but in the world as well. It is indicated in isolated patellofemoral degenerative changes.

An isolated patellofemoral arthrosis is present in about 10% of patients with osteoarthritis of the knee. In this case, replacing the entire knee joint with an endoprosthesis should be avoided. The aim is to preserve other healthy parts of the knee joint, and replace only the painful patellofemoral joint.

Consequently, this indicates the implantation of a partial endoprosthesis of a patellofemoral joint. It is an isolated primary or secondary patellofemoral arthrosis (post-traumatic conditions, patellar joint dysplasia, chronic patellar instability). The disease is manifested with pain in the frontal region of the knee, problems are aggravated when walking down the hill, up the stairs, while squatting, kneeling, etc.

If an isolated patellofemoral arthritis is unresponsive to conservative treatment, in that case this type of surgical treatment is indicated.

It is not suitable for conditions of active inflammation, either in terms of a systemic disease (rheumatoid arthritis), or in case of a septic arthritis. It is especially important to rule out the presence of chondrocalcinosis or degenerative changes in other parts of the knee.

In an elevated or a lowered position of the patella or when there is patellar instability present, additional surgical procedures on soft tissues are required in order to establish normal sliding trail of the patella.

Fig .1 A fifty-year-old patient who suffered from multifragmented patellar fracture 5 years ago. Consequent secondary patellofemoral arthrosis
Fig. 2 Partial patellar joint endoprosthesis implanted
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