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Recovery in knee range of motion reaches a plateau by 12 months after total knee arthroplasty

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

Abstract

Purpose

The primary aim of this study was to identify the time point at which improvements in knee range of motion reach a plateau, if any. The secondary aim of this study was to investigate the correlation between the improvements in knee range of motion and patient-reported outcomes [Oxford knee score (OKS) and SF-36]. The hypothesis is that there is a time point at which the recovery in the knee range of motion after total knee arthroplasty (TKA) plateaus.

Method

A prospective study of 145 patients who underwent TKA was conducted. All TKAs were performed by the same surgeon. OKS and SF-36 scores were measured preoperatively and at 6, 12, and 24 months. Range of motion was measured preoperatively and at 1, 3, 6, 12, and 24 months postoperatively.

Results

This study shows that for surgeon/therapist reported range of motion, a plateau in recovery was reached at 12 months after TKA. It was also found that range of extension is significantly correlated with OKS, whereas range of flexion was not significantly correlated with OKS.

Conclusions

Knowledge of when patients fully recover after TKA will allow appropriate counseling of patients during preoperative consultation. Also, this knowledge will enable surgeons/therapists to better monitor the rehabilitation progress of TKA patients, and make adjustments to the rehabilitation protocol. In addition, our study shows that objective surgeon-/therapist-measured outcome (range of motion) has a significant correlation with subjective patient-reported outcomes (OKS). Hence, both outcome measures should be employed in the postoperative monitoring of patient progress.

Level of evidence

Prospective case series, Level IV.

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Acknowledgments

The authors would like to acknowledge the contributions of physical therapist Ms. Chong Hwei Chi for her assistance in data collection.

Conflict of interest

No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Singapore General Hospital, Academia Level 4, 20 College Road, Singapore, 169856, Singapore

    Zhihong Zhou, Khye Soon Andy Yew, Pak-Lin Chin, Keng Jin Darren Tay, Ngai-Nung Lo, Shi-Lu Chia & Seng Jin Yeo

  2. Duke-NUS Graduate Medical School, 8 College Road, Singapore, 169857, Singapore

    Earnest Arul

Authors
  1. Zhihong Zhou
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  2. Khye Soon Andy Yew
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  3. Earnest Arul
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  4. Pak-Lin Chin
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  7. Shi-Lu Chia
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Correspondence to Zhihong Zhou.

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Zhou, Z., Yew, K.S.A., Arul, E. et al. Recovery in knee range of motion reaches a plateau by 12 months after total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 23, 1729–1733 (2015). https://doi.org/10.1007/s00167-014-3212-1

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  • DOI: https://doi.org/10.1007/s00167-014-3212-1

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