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Updated: May 5, 2026
In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
Published on: May 5, 2023
Are the long term results of a high-flex total knee replacement affected by the range of flexion?
Shinichiro Nakamura1, Hiromu Ito, Masahiko Kobayashi
1Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine, 54 Shogoin-Kawaharacho, Sakyo-ku, Kyoto, 606-8507, Japan, shnk@kuhp.kyoto-u.ac.jp.
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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