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More complications than benefits found with dual modular stem for THA
This study on one design of a dual modular stem for total hip arthroplasty revealed a 31% failure rate and linked small stem sizes with higher rates of early failure.
Researchers identified 107 patients with a mean age of 60 years and an average BMI of 33 who underwent 118 total hip arthroplasty (THA) with the Rejuvenate (Stryker) dual-modular femoral component. Eight patients were lost to follow-up, leaving a cohort of 99 patients.
Overall, results showed 36 THAs failed by clinical follow-up and needed to undergo revision for adverse local tissue reactions. After index arthroplasty, researchers found Harris Hip scores (HHS) improved in both failed and non-failed groups, but patients in the failed group experienced lower HHS at the latest follow-up. The failure group also had significantly higher serum cobalt and chromium levels and cobalt-chromium ratio.
According to multivariate logistic regression analysis, women and patients with low neck offset had a higher risk of failure from corrosion. Results showed smaller stem sizes and lower neck offset had a clinically steeper deterioration in survivorship at the 15-month follow-up. – by Casey Tingle
Disclosures: Ghanem reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.