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Low head penetration found with vitamin E-diffused highly crosslinked polyethylene liner after THA
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Recently published results showed use of vitamin E-diffused highly crosslinked polyethylene liner in total hip arthroplasty led to low head penetration at 5 years.
Forty-seven patients with osteoarthritis underwent total hip arthroplasty (THA) in 51 hips and received a vitamin E-diffused highly crosslinked polyethylene (VEPE) liner, a porous titanium shell and an uncemented stem with a 32-mm cobalt-chrome femoral head (Zimmer Biomet), according to researchers. The researchers inserted tantalum beads into the VEPE to measure femoral head penetration using radiostereometric analysis obtained preoperatively, immediately after surgery, and 6 months, 1 year, 2 years, 3 years and 5 years postoperatively along with patient reported outcome measures.
At 5 years, researchers noted 42 hips were available for follow-up. Results showed a mean error of the mean proximal head penetration into the VEPE of approximately 0.06, with statistically significant differences between the 6-month interval and 2 years, 3 years and 5 years. Researchers also noted statistically significant differences between 1 year and 2 years and between 1 year and 3 years, but no differences between 1 year and 5 years or between 2 years and later time points.
According to results, patients reported significant improvements from the preoperative scores with all improvements occurring by 6 months and maintained to 5 years. Researchers found 82% of patients had a Harris Hip Score above 90 at 5 years, as well as mean scores of approximately 1 for patient-reported pain VAS. High levels of functionality were also reported by patients at the latest follow-up with results showing a University of California, Los Angeles score of approximately 6 and a SF-36 physical function score of approximately 49. – by Casey Tingle
Disclosures: Nebergall received institutional research support from Zimmer Biomet. Please see the full study for a list of all other researchers’ relevant financial disclosures.
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