Abstract
Method.
We prospectively investigated the radiological outcomes of the uncemented Oxford medial compartment arthroplasty in 231 consecutive patients performed in a single centre with a minimum two year follow up.
Results.
The functional outcome using the Oxford knee score and the High Activity Arthroplasty Score were significantly improved on the pre-operative scores (p<0.001). There were 196 patients with a radiological examination that was acceptable for analysis of the bone-implant interface. Of the six tibial zones examined on the anteroposterior radiograph there were only three with a partial radiolucent line (3 out of 1176 zones). All were present in the medial aspect of the tibial base plate (Zone 1) and all were <1 mm in size. All of these patients were asymptomatic. There were no radiolucent lines seen around the femoral component or on the lateral tibial view. There was one revision for mal-seating of the tibial component.
Conclusions.
These results confirm that the early results of the uncemented Oxford medial compartment arthroplasty were reliable and the incidence of radiolucent lines was significantly decreased compared to the reported results of the cemented version of this implant. These independent results confirm those of the designing centre.
