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The significance of the pelvic incidence measurement as a possible predictor of TKA outcome

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To evaluate the association between the sagittal alignment of the pelvis and residual knee flexion contracture after total knee arthroplasty (TKA). This is important as a flexion contraction can be associated with the risk of poor outcomes and patient satisfaction after TKA.

Methods

This was a retrospective, case–control, study of 200 osteoarthritic knees, contributed by 200 patients, over a mean follow-up of 2.4 years. The following factors were compared between patients ‘with’ (46 knees) and ‘without’ (154 knees) a residual flexion contracture ≥ 10° after TKA: age, sex, pelvic incidence (PI), anterior femoral bowing, femoral component flexion angle (FFA), and patient-reported outcomes. Logistic regression and receiver operating characteristic curve analyses were used to identify predictive factors.

Results

The following factors were predictive of a residual flexion contracture ≥ 10°: a pelvic incidence ≥ 55° (odds ratio, 1.29; 95% confidence interval, 1.05−1.59; P = 0.031) and the FFA (odds ratio, 1.08; 95% confidence interval, 1.03−1.14; P = 0.044). A pelvic incidence cutoff of 55° yielded a significant between-group difference, with a sensitivity of 78.4% and specificity of 89.9% to differentiate a residual knee flexion contracture ≥ 10° (P = 0.001), patient satisfaction (P = 0.029), EuroQol 5-Dimension score (P = 0.028), anterior femoral curvature (P = 0.031), and Knee Injury and Osteoarthritis Outcome Score-Joint Replacement score (P = 0.046).

Conclusion

A pelvic incidence > 55° is associated with a residual knee flexion contracture ≥ 10° after TKA. The significance of the pelvic incidence measurement as a possible predictor of TKA outcome was highlighted, including its impact on patient satisfaction.

Level of evidence

III.

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Acknowledgements

We would like to thank Editage (www.editage.com) for English language editing.

Funding

This study was supported by the Grants-in-Aid for Scientific Research of Japan Society KAKENHI for the Promotion of Science (Grant Number 21K09239), and Johnson and Johnson Medical Research Grant (AS2121A000040442).

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Correspondence to Yoshinori Okamoto.

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The authors declare that they have no conflicts of interest.

Ethical approval

This study was performed in line with the principles of the Declaration of Helsinki (1964) and its subsequent amendments and was approved by the institutional review board of Osaka Medical and Pharmaceutical University hospital (approval number- 2020–098-1).

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Okamoto, Y., Wakama, H., Matsuyama, J. et al. The significance of the pelvic incidence measurement as a possible predictor of TKA outcome. Knee Surg Sports Traumatol Arthrosc 31, 3106–3115 (2023). https://doi.org/10.1007/s00167-022-07224-8

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