Comparison of Polyethylene Wear before and after Hip Revision with Liner Exchange Fixed with the Original Locking Mechanism

作者：Gu, Xinfeng; He, Jie; Tang, Yiwen; Zheng, Yuxin^*

来源：PLos One, 2016, 11(12): e0167607.

DOI：10.1371/journal.pone.0167607

• CROSS-LINKED POLYETHYLENE
• CONVENTIONAL POLYETHYLENE
• RADIOSTEREOMETRIC ANALYSIS
• ACETABULAR COMPONENT
• FOLLOW-UP
• ARTHROPLASTY
• REPLACEMENTS
• RADIOGRAPHS
• OSTEOLYSIS
• ACCURACY

Objective @@@ To compare the wear of conventional ultra-high molecular weight polyethylene (CUHMWPE) and highly cross-linked polyethylene (HCLPE) in hip revision with liner exchange fixed with original locking mechanism using analysis of history medical data. @@@ Methods @@@ From Jan. 1, 2000, to Dec. 31, 2007, 26 patients (with 29 involved hips) underwent liner exchange revision fixed with the original locking mechanism due to wear of CUHMWPE and/or osteolysis. The mean age was 53 +/- 9 years at the time of the primary total hip arthroplasty (THA) and 64 +/- 9 years at the revision. The exchanged liners (Marathon, Depuy) were made of HCLPE. Annual X-rays were used to measure linear wear and osteolysis. The annual linear penetration was measured using PolyWare software (Draftware Inc.). Annual Harris Hip Scores(HSS) were recorded. @@@ Results @@@ The mean follow-up time between the primary and revision THAs was 11 +/- 2 years and 8 +/- 2 years after revision. The mean Harris Hip Score(HHS) before primary THA, 1 year after primary THA, before revision and 1 year after revision was 43 +/- 5, 85 +/- 5, 71 +/- 6, 83 +/- 7 individually. The mean penetration of the CUHMWPE and HCLPE liners occurring in the first year were 0.44 +/- 0.28 mm and 0.38 +/- 0.14 mm, respectively (p = 0.211). The mean annual linear penetration of CUHMWPE and HCLPE from the second year onward were 0.29 +/- 0.09 mm and 0.08 +/- 0.03 mm respectively (p <0.01). All THAs with CUHMWPE showed osteolysis on ace tabular and/or femoral side before revision. No HCLPE liner showed osteolysis at the last follow-up. Conclusion: The CUHMWPE liner had a significantly higher wear rate than did the HCLPE liner. The HCLPE liner showed a satisfactory liner penetration rate after revision with isolated liner exchange fixed with the original locking mechanism.

• 出版日期2016-12-9
• 单位上海中医药大学