Are the long term results of a high-flex total knee replacement affected by the range of flexion?
Nakamura, S., Ito, H., Kobayashi, M. et al.Knee
Purpose
The purpose of this study was to examine the effect of deep flexion on the long-term durability of a high-flex ceramic implant in total knee arthroplasty.
Methods
Five hundred and five consecutive knees replaced with a Bi-Surface knee system (Kyocera Medical, Osaka, Japan) were divided into two groups according to the range of flexion by 135° postoperatively. Comparison of implant durability was made between the high- and low-flexion groups after a minimum ten year follow-up.
Results
With revision for any surgery as the end point, the survival rates at ten years were 95.5 % and 96.2 % in the high- and low-flexion group, respectively (p = 0.63). With revision for mechanical failure as the end point, survival rates were 98.7 % and 98.5 %, respectively (p = 0.94).
Conclusion
Implant survival rate was similar for both groups. Deep flexion seemed not to affect long-term durability.
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