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A retrospective study on the relationship between altered native acetabular angle and vertical implant malpositioning
Jorge Rojas1, Maria Bautista2, Guillermo Bonilla3
1Department of Orthopedics and Traumatology, Hospital Universitario Fundación Santa Fe de Bogotá, Bogotá, D.C., Colombia.
International Orthopaedics
|August 8, 2017
Summary
Altered native Sharp's angle, an indicator of hip dysplasia, increases the risk of acetabular cup malpositioning during total hip arthroplasty. Pre-operative assessment of Sharp's angle is recommended for improved surgical planning and outcomes.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Acetabular cup positioning is critical for total hip arthroplasty (THA) success.
- Extreme vertical angles can compromise implant stability and long-term survivorship.
- Native hip anatomy, specifically Sharp's angle, may influence component placement.
Purpose of the Study:
- To investigate the association between native Sharp's angle and acetabular component abduction angle in THA.
- To determine if an altered pre-operative Sharp's angle predicts malpositioning of the acetabular component.
Main Methods:
- Retrospective analysis of 528 primary THA cases (Feb 2012 - Aug 2015).
- Measurement of acetabular implant vertical positioning on post-operative radiographs.
- Multivariate analysis to evaluate Sharp's angle and other factors for cup malpositioning.
Main Results:
- Prevalence of acetabular cup malpositioning was 7.6%.
- An altered pre-operative Sharp's angle was significantly associated with increased risk of vertical malpositioning (OR 2.51, p=0.02).
- Body mass index, surgeon volume, implant size, gender, diagnosis, and age were not associated with cup position.
Conclusions:
- Altered native Sharp's angle is a significant predictor of acetabular cup malpositioning in THA.
- Systematic pre-operative assessment of Sharp's angle is crucial for planning primary hip arthroplasty.
- This assessment may help mitigate risks associated with hip dysplasia and improve implant outcomes.
