Abstract
We report long term outcomes of the Rotaglide mobile bearing total knee arthroplasty (RTK).
Method
Between 1995 and 1998, 61 RTK prostheses were implanted at our institution consecutively. Of 34 knees with a median duration to end of follow up of 13.0 years (range 11.4 to 14.2 years), the clinical result using Knee Society Score and radiological analysis using Knee Society Roentgenographic Sytstem was evaluated.
Result
The prosthesis had an estimated survival probability of 94.1% at 13 years. There was one case of deep infection and one case of meniscal component failure.
Clinical evaluation and knee function
The mean Knee score and function score at final follow-up are 90.0±8.3 and 61.8±29.6. The mean postoperative range of motion at final follow-up was from 0.7° (range 0–20°) to 117.8° (range 90–135°).
Radiological analysis
The mean post operative FTA, aangle, ßangle, dangle are 173.8±3.9°, 96.4±2.2°, 90.9±3.1°, 81.3±2.9°. Clear zone was recognized in 2 tibia components but no progression was confirmed in the follow-up duration.
Discussion
RTK is mobile bearing total knee which has a one piece meniscal component that is able to glide antero-posteriorly and rotate on the tibial component. Area contact between meniscal component and femoral component can be maintained from 0°to 90°of flexion. RTK gives satisfactory long-term clinical results. No knees were revised for aseptic loosening. This may be a result of the implant design.
