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Objective: Severe osteoarthritis of the hip may cause abnormal spinopelvic alignment, commonly known as hip-spine syndrome. No prospective clinical reports have however appeared regarding the influence of total hip arthroplasty (THA) on the improvement of spinopelvic alignment. The purpose of this study was to examine chronological changes in pelvic orientation and spinal alignment after THA.
Methods: A total of 59 patients who underwent THA were included in this prospective study. The anterior pelvic plane (APP) (DiGioia, et al.), lumbo-sacral angle (LSA), lumbo-lordotic angle (LLA), and thoraco-kyphotic angle (TKA) were measured as parameters of spinopelvic alignment on standing radiographs before and 3, 6, and 12 months after THA. Chronological changes in those parameters after THA were investigated.
Results: APP and LSA decreased with time, indicating posterior pelvic tilt after THA. LLA and TKA showed no significant change after THA.
Conclusions: Posterior tilting of the pelvis was seen after THA.
