Abstract
Introduction
Hip–spine syndrome, wherein flexion deformity of the hip might exaggerate normal lumbar lordosis (LL), was first described in 1983. It could result in subluxation of the posterior facets and cause low back pain (LBP). However, the clinical outcomes of total hip arthroplasty (THA) and spinal alignment changes in patients with lumbar hyperlordosis (hyper LL) remain unknown. We aimed to clarify the proportion of patients with hyper LL before THA and compare pre- and post-operative sagittal spinal alignment, LBP, and clinical outcomes between patients with hyper LL and those with normal LL.
Materials and methods
We investigated 278 patients who underwent primary THA between December 2015 and December 2019. Spine radiographs in the standing position were examined preoperatively and 1 year postoperatively. Patients with hyper LL were defined as having a pelvic incidence (PI) minus LL of < − 9° preoperatively. The control group included age- and sex-matched patients with normal LL, defined by a PI minus LL of − 9° to 9°. Clinical outcomes were evaluated using the visual analogue scale (VAS) for LBP, Harris hip score (HHS), Oxford hip score (OHS), and University of California, Los Angeles (UCLA) activity score.
Results
Thirty-eight patients (13.7%) had hyper LL, and they exhibited a lower pelvic tilt, lower sagittal vertical axis, and greater sigmoid curvature than did the controls. Evaluation of changes in the spinal alignment after surgery showed that the pelvis tilted more posteriorly, and LL decreased more in the hyper LL group than in the control group. Pre- and post-operative VAS for LBP, HHS, OHS, and UCLA activity scores were not significantly different between the two groups.
Conclusion
Hyper LL in patients with hip osteoarthritis had no adverse effects on LBP and the clinical outcomes of THA. Hyper LL may partially result from a flexible and adaptable lumbo-pelvic structure.
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Data availability
The datasets analyzed in this study are available from the corresponding author on reasonable request.
Code availability
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This research received a Grant from the Japan Orthopaedics and Traumatology Foundation, Inc. (Grant number 463).
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YO and TM collected and interpreted the patient’s data. YO was a major contributor in writing the manuscript. TM, TK, YK, KG, and SM were involved in report design, critically revised the report, and commented on drafts of the manuscript. All authors read and approved the final manuscript.
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Shuichi Matsuda has received speaker and consultant honoraria from Kyocera. Other authors have no relevant financial or non-financial interests to disclose.
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This retrospective chart review study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Human Investigation Committee (IRB) of Kyoto University approved this study.
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Okuzu, Y., Miyahara, T., Goto, K. et al. Investigating sagittal spinal alignment, low back pain, and clinical outcomes after total hip arthroplasty for lumbar hyperlordosis: a retrospective study. Arch Orthop Trauma Surg 142, 4007–4013 (2022). https://doi.org/10.1007/s00402-021-04266-4
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DOI: https://doi.org/10.1007/s00402-021-04266-4