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Is medial pivot total knee arthroplasty suitable for patients with valgus knee osteoarthritis?

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European Journal of Orthopaedic Surgery & Traumatology Aims and scope Submit manuscript

Abstract

Purpose

Medial pivot total knee arthroplasty (MP-TKA) is characterized by the ball-in-socket medial tibiofemoral articulation to achieve low wear and to reproduce the medial pivot motion similar to that in the normal knee, and there have been reports of favorable long-term postsurgical outcomes. However, most of these cases concerned varus knees, and the outcomes of MP-TKA in valgus knees are unknown.

The objective of this study was to investigate the postoperative outcomes in end-stage valgus knee OA patients who underwent MP-TKA, through comparisons with those who underwent TKA using the same prosthesis for varus deformity.

Methods

This retrospective, single-center, cohort study analyzed 171 knees of 121 patients who were divided into two groups (valgus knee group: 15 knees (13 patients), varus knee group: 156 knees (109 patients)). Primary outcome measures included the knee joint range of motion (evaluated preoperatively and at every year postoperatively). Secondary outcomes included operative time, laboratory data, estimated blood loss, clinical outcome measures and adverse events.

Results

There were no significant differences in age, sex and body mass index, as well as in the postoperative primary and secondary outcome measures between the two groups.

Conclusion

The use of MP-TKA featuring ball-in-socket medial tibiofemoral articulation in patients with valgus knee OA showed equally favorable clinical outcomes more than 2 years after surgery, compared to patients with varus knees who received MP-TKA.

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Acknowledgements

All authors have no conflict of interest. We did not receive grants or outside funding in support of their research or preparation of this manuscript. We thank Shingo Maeda, Hitomi Takuma and Syogo Shibata for the assistants of the orthopedic surgery in Shiraniwa Hospital.

Funding

We did not receive grants or outside funding in support of our research or preparation of this manuscript.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Shiraniwa Hospital Joint, Arthroplasty Center. 6-10-1 Shiraniwadai Ikoma-city, Nara, 630-0136, Japan

    Kentaro Iwakiri, Yohei Ohyama & Akio Kobayashi

  2. Department of Orthopaedic Surgery, Osaka City University Graduate School of Medicine, 1-4-3 Asahi-machi Abeno-ku Osaka-city, Osaka, 545-8585, Japan

    Yoichi Ohta, Yukihide Minoda & Hiroaki Nakamura

Authors
  1. Kentaro Iwakiri
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  2. Yoichi Ohta
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  3. Yohei Ohyama
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  4. Yukihide Minoda
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  5. Akio Kobayashi
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  6. Hiroaki Nakamura
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Corresponding author

Correspondence to Kentaro Iwakiri.

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Conflict of interest

All authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This trial was registered as a trial with the University Hospital Medical Information Network (UMIN) Registration Number UMIN000040541.

Consent to participate

The study protocol was approved by the institutional review board, and all patients provided written informed consent to participate.

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Iwakiri, K., Ohta, Y., Ohyama, Y. et al. Is medial pivot total knee arthroplasty suitable for patients with valgus knee osteoarthritis?. Eur J Orthop Surg Traumatol 32, 551–557 (2022). https://doi.org/10.1007/s00590-021-03007-y

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  • DOI: https://doi.org/10.1007/s00590-021-03007-y

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