Orthopaedic Posters
AB214. SOH25_AB_034. Anatomic head size combined with computer navigation has low dislocation rate in high-risk patients
Logan Martin1, William Long2, Joseph Basta2, Chukwuma Iwuoha3, Austin Elliott4, Jeramy Landis2, William Ross5
1School of Medicine, University College Dublin, Belfield, Dublin, Ireland;
2Computer Surgery Institute, CHA, Hollywood, Presbyterian Medical Center, Los Angeles, CA, USA;
3Residency Programme, Mission Community Hospital, Panorama City, CA, USA;
4School of Medicine, University Centre Grenada, West Indies, Grenada;
5School of Medicine, Morehouse School of Medicine, Atlanta, GA, USA
Background: Hip dislocation following total hip arthroplasty (THA) remains the leading cause of failure, requiring revision surgery. Control of cup placement using computer navigation (CN) and use of larger diameter heads are two methods that have emerged to decrease the incidence of dislocation. A review of published research revealed no studies that examined the effectiveness of combining anatomic head size with CN to prevent the occurrence of early and late hip dislocation in high-risk patients.
Methods: This is a retrospective study of 438 patients (540 hips) who had a THA performed between 2006 and 2017. The study included 246 hips with skeletal, soft tissue or central nervous conditions associated with an increased risk of total hip dislocation. We defined anatomic head size as a femoral head size 6 mm smaller than the outer diameter of the cup. The study compares the effectiveness of this protocol preventing dislocation in patients classified as high risk and not-high-risk for dislocation.
Results: Mean follow-up time was 49.92 months. In the study group, 5 (0.92%) hips dislocated and 3 (0.56%) hips required a revision for dislocation. In the high-risk group, 3 had a dislocation and 2 had a revision for dislocation. Of the 294 hips in the not-high-risk group, 2 had a dislocation and 1 had a revision for dislocation.
Conclusions: We found that CN-THA combined with utilization of an anatomic size femoral head resulted in low rates of early dislocation, late dislocation, and revision for dislocation in patients classified as high risk and not-high-risk for dislocation.
Keywords: Anatomic head; computer navigation (CN); dislocation; risk factor; total hip arthroplasty (THA)
Acknowledgments
None.
Funding: None.
Conflicts of Interest: The authors have no conflicts of interest to declare.
Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.
doi: 10.21037/map-25-ab214
Cite this abstract as: Martin L, Long W, Basta J, Iwuoha C, Elliott A, Landis J, Ross W. AB214. SOH25_AB_034. Anatomic head size combined with computer navigation has low dislocation rate in high-risk patients. Mesentery Peritoneum 2025;9:AB214.
