Background
In cases of isolated patellofemoral osteoarthritis partial knee arthroplasty seems logical, similar to unicompartmental tibiofemoral osteoarthritis, because patellofemoral arthroplasty preserves bone stock and the cruciate ligaments.
Objectives
To clarify whether the concept of patellofemoral arthroplasty is supported by the levels of evidence reported in the literature. Moreover, it is the aim of this article to highlight the indications and contraindications for patellofemoral arthroplasty. Specific indications for concomitant procedures are illustrated by case reports.
Methods
A systematic literature search was carried out in PubMed. The results are provided with an emphasis on the respective levels of evidence.
Results
Several types of patellofemoral arthroplasty were already defined as obsolete. If these are excluded from the analysis, joint survival times can be expected similar to those reported for unicondylar knee arthroplasty. This is supported by case series with follow-up periods of 10 years and also supported by data from joint registries. The surgeon performing patellofemoral arthroplasty should, however, be equipped to sometimes carry out concomitant procedures for stabilization of the patella.
Conclusions
Based on the literature patellofemoral arthroplasty can be classified as a useful procedure for appropriate patients. If the indications are correct, joint survival times similar to unicondylar knee arthroplasty can be expected.