Pelvic tilt increases the risk of impingement and alters impingement type in total hip arthroplasty:​ a patient-specific simulation study

Palit, Arnab; Williams, Mark A.; Seemala, Vineet; Donnelly, Mike; Renkawitz, Tobias; Weber, Markus

Affiliations

¹WMG, The University of Warwick, Coventry, UK

²Department of Orthopaedic Surgery, Regensburg University, Regensburg, Bad Abbach, Germany

³Department of Orthopedic and Trauma Surgery, Barmherzige Brueder Regensburg, Regensburg, Bad Abbach, Germany

Abstract and keywords

Impingement is a significant complication following total hip arthroplasty (THA), resulting in restricted range of motion (ROM). Pelvic tilt (PT) and its variation could alter both post-THA ROM and impingement types, which remains relatively unexplored in the literature. Therefore, this study aims to investigate the impact of PT changes on post-THA ROM and impingement types. Subject-specific ROM was simulated using 3D-CT and clinical data for 56 THA patients. Subsequently, the effect of no-PT, standing preoperative (StPT₀) and postoperative PT at 6 (StPT₆) and 12 months (StPT₁₂) on maximum ROM (flexion, extension, abduction, adduction, external rotation (ER) and internal rotation at 90° Flexion (IR@90°Flex)) and impingement types (implant-to-implant impingement (ITII), implant-to-bone impingement (ITBI), and bone-to-bone impingement (BTBI)) were investigated. Stong correlations existed between PT and flexion (R² ≥ 0.686), extension (R² ≥ 0.527), and IR@90°Flex (R² ≥ 0.547). Anterior PT exceeding 8.1° and 11.8° were linked to decreased flexion below 110° and IR@90°Flex below 30°, respectively. Each 10° increase in anterior PT resulted in a 10° reduction in flexion and a 10.7° reduction in IR@90°Flex. Impingement types due to PT remained unchanged for flexion/extension, with increased ITII for abduction (8.9%), adduction (23.2%), and IR@90°Flex (16.1%), and increased BTBI (16.1%) for ER. In total, 12.5% and 19.6% of patients experienced clinically relevant ROM change for flexion and IR@90°Flex, respectively for StPT₀–StPT₆. However, it affected below 5.4% cases when comparing StPT₆ and StPT₁₂. Minor changes in impingement type (< 6% of cases) were observed due to changes in PT before and after THA, as well as temporal changes in PT post-THA. However, PT had a substantial impact on impingement types when comparing ROM without considering PT to ROM with PT included. Specifically, anterior PT was associated with reduced flexion and IR@90°Flex, indicating a higher risk of impingement. PT changes over time may lead to clinically relevant alterations in ROM but not impingement types.

Trial Registration: German Clinical Trials Register; Main ID: DRKS00000739.

Keywords: impingement; pelvic tilt; randomized control trial (RCT); range of motion (ROM) simulation; total hip arthroplasty (THA)

Links

DOI: 10.1002/jor.26085

PubMed: 40221867

WoS: 001465784100001

History

Received: 2024-08-22

Revised: 2025-02-05

Accepted: 2025-03-25

Cited Works (2)

Year	Entry
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