Article Abstract

Medial unicompartmental knee arthroplasty

Authors: Francesco Atzori, Matteo Schirò, Claudia De Feo, Nicolò Borromeo, Roberto Russo


Background: Unicompartmental knee arthroplasty (UKA) is a surgical procedure even now discussed, but interest on it increased rapidly over the last three decades. Recently, the introduction of minimally invasive surgical (MIS) techniques with modified surgical instruments reduced morbidity, complications and the hospital recovery time.
Methods: From January 2014 to December 2015 we treated 45 knees in 44 patients. Each patient was subjected to a clinical exam and radiographic investigations before and after surgery. We used Oxford Partial Knee system as unicompartmental implants. On postoperative standard anterior-posterior and lateral views, we evaluated the positioning of the implants.
Results: The mean femoral component flexion was 5 degrees and the mean tibial slope was 5 degrees. The mean varus/valgus angle of femoral component was 5 degrees valgus, while the mean varus/valgus angle of tibial component was 3 degrees varus. After 2-year follow up, the results of our monocompartimental arthroplasty are promising.
Conclusions: The mean position of the components appears correct if compared with the literature. The method we used to evaluate femoral component flexion of prosthetic implant could be useful for better understanding of UKA and its failure.