Abstract
Introduction
In hip osteoarthritis, hip flexion contracture can severely alter the patient’s alignment, and, therefore, affect the patient’s quality of life (QOL). Hip contracture is not well-studied, partly because of the difficulties of its diagnosis. The aim of this study was to propose a quantitative definition of hip flexion contracture, and to analyse sagittal alignment in these patients compared to non-contracture ones, before and 12 months after total hip arthroplasty (THA).
Materials and methods
Consecutive patients with hip arthrosis and an indication for THA were included (N = 123). Sagittal full-body radiographs were acquired in free standing position and in extension. QOL questionnaires were administered before and after surgery. Spinopelvic parameters were measured, including the pelvic–femur angle (PFA). Patients with low pelvic incidence (< 45°) were included in the hip contracture group if PFA > 5°, or PFA > -5° when pelvic incidence ≥ 45°.
Results
29% of patients were in the hip flexion contracture group, and they showed lower pelvic tilt than the no-contracture group (p < 0.001), larger lumbar lordosis (LL) and smaller PI-LL (p < 0.001), as well as a forward position of the head. 16% of patients still had hip contracture 12-months postop. Contracture patients showed higher QOL scores after surgery.
Conclusions
The proposed method to diagnose hip contracture group allowed to define a group of patients who showed a specific pattern of sagittal spinopelvic alignment. These patients improved their alignment and quality of life postoperatively, but their hip mobility was not always restored. Diagnosing these patients is a first step toward the development of more specific surgical approaches, aiming to improve their surgical outcome.
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Acknowledgements
The authors are grateful to the Japan Society for the Promotion of Science for funding, and to Ms. Yasuda Hisayo for her technical support.
Funding
The study was funded by the Japan Society for the Promotion of Science trough an invitational fellowship grant (S21026). The study sponsor had no role in study design, collection, analysis and interpretation of data; in the writing of the manuscript; or in the decision to submit the manuscript for publication.
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CV: concept and design, obtaining of funding, analysis and interpretation of the data, drafting of the article, and final approval of the article. CV was the main investigator of this study, and performed all of the measurements. YK: provision of study patients, obtaining of funding, collection, analysis and interpretation of data, participation in the reproducibility study, critical revision of the article for important intellectual content and final approval of the article. MT: concept and design, analysis and interpretation of data, critical revision of the article for important intellectual content, and final approval of the article. YS: provision of study patients, analysis and interpretation of data, critical revision of the article for important intellectual content, and final approval of the article. CT: provision of study patients, analysis and interpretation of data, critical revision of the article for important intellectual content, and final approval of the article. SF: provision of study patients, analysis and interpretation of data, critical revision of the article for important intellectual content, and final approval of the article. SF: provision of study patients, analysis and interpretation of data, critical revision of the article for important intellectual content, and final approval of the article. SM: concept and design, obtaining of funding, analysis and interpretation of data, critical revision of the article for important intellectual content, and final approval of the article.
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Vergari, C., Kim, Y., Takemoto, M. et al. Sagittal alignment in patients with flexion contracture of the hip before and after total hip arthroplasty. Arch Orthop Trauma Surg 143, 3587–3596 (2023). https://doi.org/10.1007/s00402-022-04606-y
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DOI: https://doi.org/10.1007/s00402-022-04606-y