This study aims to investigate the long-term clinical outcomes, complications and survival rates of cemented Oxford medial unicompartmental knee arthroplasty (UKA) and to compare the findings with the reported outcomes of UKA and total knee arthroplasty (TKA) in the literature.
In the study, 133 knees of 115 patients (16 males, 99 females; mean age 65.5±8.3 years; range, 50 to 88 years) who underwent Oxford medial UKA between May 2007 and August 2013 were followed-up for an average of 126 months. Prosthetic complications and revisions were evaluated. While Kaplan-Meier method was used to evaluate implant survival, Knee Society, Functional Knee Society and visual analog scale scores were used for determining final functional outcomes.
Totally 29 prosthetic complications (21.6% of total patients) were observed and the most common one was insert dislocation observed in 17 knees (12.6%). Revision surgeries were performed for all of these patients. Among the 17 patients who underwent insert replacement surgeries, the inserts were stable in eight during the follow-up while insert dislocation reoccurred in nine. Revision surgeries were performed in a total of 21 patients (15.6%). There were statistically significant improvements in final follow-up functional knee scores of patients without complications compared to preoperative scores.
According to our findings, while reoperation and early aseptic revision rates of Oxford medial UKA are high compared to the TKA results reported in the literature, functional results are satisfactory for patients with no revision.