| Objective To compare the clinical outcomes and linear wear rates of highlycross-linked polyethylene liner to traditional polyethylene liner.Methods We reviewed68patients (71hips) who underwent total hip arthroplasty(THA) between January2005and February2007, using highly cross-linked or traditionalpolyethylene liner. According to the type of liner used the patients were divided in twogroups, including highly cross-linked polyethylene liner group and traditional polyethyleneliner group (control group). We then compared the result of gender, age, body weight andetiological factor from the two groups. Radiographic analysis included measurements oflinear wear, osteolysis and clinical outcomes was assessed with the use of the Harris hipscore (HHS).Results The mean follow-up of highly cross linked polyethylene group was6.3years(5-7years),; Harris score improved from38.7±5.26points to91.9±3.21points3monthsafter surgery, at the last follow up HHS was88.1±4.88points. In control group the meanfollow up was6.5years (4-7years). Harris score improved from39.5±4.67points to92.3±2.97points3months after surgery, and at the last follow-up HHS was84.6±18.1points.There was no significant difference in Harris score between the two groups at thefollow-up (p>0.05). Osteolysis was observed in3cases from the control group. No signs ofosteolysis was observed in the highly cross-linked polyethylene liner group. The latesX-ray showed no aseptic loosening in the two groups. The mean cumulative penetration ofthe highly cross-linked group were significantly lower than the control group at thefollow-up (p>0.05). Linear wear rate was0.025±0.0016mm/year in the highlycross-linked polyethylene liner group and0.086±0.005mm/year in the control group(z=6.804，p<0.05).Conclusion No significant difference was found in the clinical outcomes between highly cross-linked polyethylene and the control group, but the linear wear rates weresignificantly lower in highly cross-linked polyethylene than in the control group. |
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