Instability Risk Factors in Total Hip Arthroplasty for Femoral Neck Fracture
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Abstract
Materials and Methods: We carried out a retrospective study on 110 THAs in patients with femoral neck fractures (the average age was 69 years, and 71% were women). The type of fixation of the prosthesis, the size of the head, the offset, and the surgical approach were evaluated. The angle of acetabular inclination and anteversion and the comorbidities were measured.
Results: 72% of surgeries were performed through the posterolateral approach. The anterolateral approach is associated with a 7° more vertical cup (p=0.001). 65.4% of the heads were 32 mm. 15% of the small heads (22 and 28mm) (3/20) and only 1% of the large heads (1/90) dislocated (p=0.0027). No 36-mm heads were dislocated. Depression, Parkinson’s, and Alzheimer’s disease were the most frequent neurological comorbidities.
Conclusions: Small-diameter heads, in combination with poor positioning of the prosthesis and neurocognitive diseases, are associated with greater instability. Using prosthetic heads with a diameter of 36 mm and a correct orientation of the components is sufficient to ensure stability.
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