Dislocation Incidence and Risk Factors Following Direct Anterior Primary Total Hip Arthroplasty: A Consecutive, Single-Surgeon Cohort Publisher Pubmed



Mirghaderi P^{1, 2} ; Pahlevanfallahy MT^{1, 3} ; Rezaee H³ ; Moharrami A³ ; Ravanbod H⁴ ; Pourgharibshahi MH¹ ; Mortazavi SMJ^{3, 5} Show Affiliations
Source: BMC Musculoskeletal Disorders Published:2025

Abstract

Backgrounds: Dislocation is one of the debilitating complications of total hip arthroplasty. It is a common reason for revision surgery after THA, along with other complications such as infection and instability. This study determined the incidence and risk factors of dislocation after primary total hip arthroplasty using the direct anterior approach. Methods: Retrospective Data from patients who underwent primary THA from 2013 to 2020 was analyzed. Anteversion and inclination angles were extracted from their imaging studies, and demographic data were also recorded from their medical records. Data were analyzed using SPSS version 26. Results: One thousand two hundred four cases of THA were reviewed in our study. 31 (2.57%) dislocations happened after a minimum follow-up of five years. Our study showed that DDH diagnosis as the underlying condition, using Wagner Cone and Wagner SL stem, cup size smaller than 52, head size smaller than 34, anteversion and inclination angle outside the Lewinnek safe zone can be risk factors for dislocation. Primary OA and Fitmore stem acted as protective factors for dislocation. Conclusion: In the DA approach, the underlying disease, properties of the prosthesis used such as cup and head size, stem type, and anteversion and inclination angles can be the potential risk factors for dislocation. Level of evidence: III © The Author(s) 2025.