Article
Impact of dual mobility total hip arthroplasty on post-operative dislocation in patients with neck of femur fractures – a single centre study
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Authors
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Prashan Lokanathan
- Mid Yorks NHS Trust, Wakefield, United Kingdom
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Fiona Wells
- Mid Yorks NHS Trust, Wakefield, United Kingdom
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Stefan Niculescu
- Mid Yorks NHS Trust, Wakefield, United Kingdom
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Aaron Ng
- Mid Yorks NHS Trust, Wakefield, United Kingdom
| Published: | October 26, 2021 |
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Outline
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Objectives: Post-operative dislocation following Total Hip Arthroplasty in patients with neck of femur fractures is a great concern (2-10%). Dual mobility cups have been suggested to address this complication. Our study sets out to compare the dislocation rates between 2 types of dual mobility total hip arthroplasty (DM THA) in patients with neck of femur fractures in our institution.
Methods: This is a retrospective study on data collected on patients with neck of femur fractures who were treated with DM THA during August 2017 - September 2020. 2 types of DM THA were used during this period :- Zimmer Biomet G7 DM acetabular system (Group 1) or Novae SERF system (Group 2). Patients were reviewed to assess for post-operative dislocations following DM THA. Details on implants, complications and dislocations were obtained via the electronic patient record and patient radiograph.
Results and Conclusion: 90 patients were identified to have DM THA used for neck of femur fractures between August 2017 to September 2020. The mean age of patients was 70.67. The age range of patients was 46-89 years old. 66 patients are female and 24 male. Of the 90 patients, 37 patients were identified to have had the G7 Dual Mobility Acetabular system. Out of the 37 patients, 1 (2.7%) patient sustained a posterior dislocation. 53 patients had a THR with the SERF System. 1 (1.9%) patient sustained a posterior dislocation. Both patients sustained the dislocation following a mechanical fall. The P value on Fisher's exact is 1.0. The mean Charlson Comorbidity index for the 90 patients was 3.52 (Group 1=3.49:Group 2=3.55). Group 1 did not have any other complications recorded. Group 2 had 1 (1.9%) patient present with infection of prosthesis.The mean follow up time for the patients is 12 months 16.5 days (range 15 to 1156 days).
This study revealed that the use of DM THA in patients with neck of femur fractures reduced the risk of post-operative dislocation. Both the G7 Dual Mobility acetabular system and NOVAE SERF acetabular system for THA in neck of femur fractures are equally effective and have a low risk of dislocations.
