Five-Year Experience of XXXX -Diffused Highly Cross-Linked @entity691 Wear in Total Hip Arthroplasty Assessed by Radiostereometric Analysis.

@entity691 @entity1 @entity270 @entity702 @entity1953
BACKGROUND: @entity270 -diffused highly cross-linked @entity691 (VEPE) was developed to reduce oxidation without compromising mechanical strength. The purpose of this study was to evaluate VEPE in  vivo using radiostereometric analysis (RSA) and @entity1 -reported outcome measures (PROMs). METHODS: Fifty-one hips were enrolled. Each @entity1 received a VEPE liner, a porous @entity702 shell, and an uncemented stem with a 32-mm @entity1953 -chrome femoral head. Tantalum beads were inserted into the VEPE to measure femoral head penetration using RSA. RSA radiographs and PROMs were obtained preoperatively immediately after surgery, 6 months, 1, 2, 3, and 5 years after surgery. RESULTS: Forty-seven hips returned at 3 years, and 42 hip at 5 years. The mean    standard error of the mean proximal head penetration into the @entity691 was 0.06    0.01 at 5 years. The amount of head penetration did not change significantly with increasing time in  vivo. The mean    standard error of the mean Harris Hip Score was 58    2 preoperatively, which improved significantly to 93    2 at 5 years (P  <  .001). CONCLUSION: The head penetration into VEPE liners was low compared with non-VEPE at 5 years. After settling of the liners in the early period, no significant head penetration occurred from 2- to 5-year follow-up. All PROMs improved significantly from preoperative to postoperative and remained very favorable at 5 years. This study documents the longest-term evaluation of in  vivo wear performance of VEPE.
