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Preoperative flexion does not influence postoperative flexion after rotating-platform total knee arthroplasty

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

Preoperative range of motion (ROM) has been regarded as one of the most important factors in predicting postoperative ROM following total knee arthroplasty (TKA). Mobile-bearing TKA designs have been suggested to possibly improve the knee kinematics compared to fixed-bearing designs. The purpose of this study was to examine the difference in postoperative flexion as a function of preoperative flexion in a consecutive series of TKAs done using a posterior-stabilized rotating-platform prosthesis.

Methods

ROM was assessed in 153 consecutive TKAs done using a rotating-platform posterior cruciate-substituting design. Patients were divided into two groups based on their preoperative ROM (Group 1 < 95°, Group 2 > 95°). The Knee Society Score (KSS) and ROM were assessed preoperatively, 3 months and 12 months postoperatively.

Results

There was no difference in flexion 12 months after surgery between groups (mean 120° and 123°, respectively. n.s.). After 3 month follow-up, no increase in ROM was experienced by either group. Patients in Group 1 experienced significantly greater increases in both ROM (p < 0.001) and KSS (p < 0.05). There was no difference in the KSS at 12 months after surgery between groups.

Conclusion

In this series of patients undergoing TKA with a rotating-platform prosthesis, the preoperative ROM was not predictive of the postoperative ROM. Patients with stiff knees preoperatively may benefit from a mobile-bearing design prosthesis.

Level of evidence

Case–control study, Level III.

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Correspondence to Robert D. Russell.

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Russell, R.D., Huo, M.H., de Jong, L. et al. Preoperative flexion does not influence postoperative flexion after rotating-platform total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 22, 1644–1648 (2014). https://doi.org/10.1007/s00167-013-2378-2

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  • DOI: https://doi.org/10.1007/s00167-013-2378-2

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