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|Title:||Wear of a highly cross-linked polyethylene liner: a preliminary RSA study|
|Citation:||European Journal of Orthopaedic Surgery & Traumatology, 2009; 20(1):23-27|
|David Campbell, Graham Mercer, Kjell-Gunnar Nilsson, Vanessa Wells, John R. Field and Stuart A. Callary|
|Abstract:||Wear induced peri-prosthetic osteolysis and aseptic loosening remain the major contributing factors to failure of total hip arthroplasty. To reduce wear particles from acetabular liners, the process of polyethylene cross-linking has been modified. In this study, we examine the wear of Marathon™ acetabular liners using Radiostereometric Analysis. Thirty patients were enrolled in a prospective cohort study. Femoral head penetration was calculated for 25 patients at 6 months, 1 and 2 years postoperatively. The mean proximal head penetration was 0.067 mm at 6 months, 0.113 mm at 1 year and 0.120 mm at 2 years. The mean three-dimensional femoral head penetration was 0.240 mm at 6 months, 0.230 mm at 1 year and 0.232 mm at 2 years. For both parameters, there was no measurable wear between 1 and 2 years, and the mean annual linear wear was less than 0.06 mm/year, which is less than the suggested osteolysis threshold for polyethylene. All patients demonstrated a dramatic improvement in clinical scores. These results were comparable with other studies that used alternative techniques with conventional radiography to evaluate wear for Marathon™. Long-term studies using the RSA method are recommended to further quantify the clinical performance of this polyethylene liner.|
|Keywords:||Hip; Wear; RSA; Polyethylene; Radiostereometric analysis; Cross-linked|
|Appears in Collections:||Orthopaedics and Trauma publications|
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