Spinopelvic mobility is influenced by pre-existing contralateral hip arthroplasty: a matched-pair analysis in patients undergoing hip replacement

Autor: Maximilian Muellner, Luis Becker, Zhen Wang, Zhouyang Hu, Sebastian Hardt, Matthias Pumberger, Henryk Haffer
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of Orthopaedic Surgery and Research, Vol 17, Iss 1, Pp 1-9 (2022)
Druh dokumentu: article
ISSN: 1749-799X
DOI: 10.1186/s13018-022-02945-5
Popis: Abstract Background Spinopelvic mobility gained increased attention as a contributing factor for total hip arthroplasty (THA) instability. However, it is unknown how a pre-existing THA affects spinopelvic mobility. Therefore, a propensity-score-matched analysis of primary THA patients comparing the individual segments of spinopelvic mobility between patients with pre-existing THA and no-existing THA was conducted. Consequently, the study aimed to discuss (1) whether patients with a pre-existing THA have altered spinopelvic mobility compared to the control group and (2) if spinopelvic mobility changes after THA. Methods A prospective observational study enrolled 197 elective primary THA patients, including N = 44 patients with a pre-existing unilateral THA. Using propensity-score matching adapted for age, sex, and BMI, N = 44 patients without a pre-existing THA were determined. The patients received stereoradiography in standing and relaxed sitting position pre- and postoperatively. Assessed parameters were lumbar lordosis (LL), pelvic tilt (PT), and pelvic femoral angle (PFA). Key parameters of the spinopelvic mobility were defined as lumbar flexibility (∆LL = LLstanding − LLsitting), pelvic mobility (∆PT = PTstanding − PTsitting) and hip motion (∆PFA = PFAstanding − PFAsitting). Pelvic mobility was classified as stiff (∆PT 30°). The Wilcoxon rank sum test for dependent samples was used. Results Pelvic mobility was significantly increased in the pre-existing THA group (∆PT 18.2° ± 10.7) compared to the control group (∆PT 7.7° ± 8.0; p
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