Abstract
Purpose
The aim of this study was to assess the outcome of cementless total hip arthroplasty (THA) in cases of osteonecrosis of the femoral head.
Materials and Methods
We studied long-term outcomes for 54 patients (72 hips). Mean duration of follow-up was 13.5 years. Clinical outcomes were evaluated by the Harris Hip Score. Radiographic evaluation from the preoperative and follow-up periods included assessment of the fixation of the femoral and acetabular components, polyethylene wear, osteolysis, and radiolucent line.
Results
The mean Harris Hip Score improved from a preoperative value of 51.9 points to 89.4 at final follow-up. Regarding the femoral components, there was radiographic evidence of stable bony ingrowth in 69 hips, stable fibrous ingrowth in 2 hips and unstable fixation in 1 hip. There was a radiolucent line of less than 1 mm in 7 hips, and femoral osteolysis in 27 hips. Regarding the acetabular components, there was radiographic evidence of stable fixation in 68 hips, unstable fixation in 4 hips, and osteolysis in 39 hips. There was a significant correlation between (i) failure of components and (ii) femoral osteolysis, acetabular osteolysis, polyethylene thickness, linear wear rate per year, or total linear wear.
Conclusion
The findings of this study show favorable long term results, both clinical and radiographic, using cementless total hip replacement arthroplasties. However, the revision rates for the Harris-Galante acetabular components were high. Wear of the load? weight? bearing surface continues to limit the long-term success rate of THA, and improved design of the acetabular components should be considered.
Figures and Tables
References
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