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Researchers find good long-term results for uncemented hydroxyapatite-coated THA implant
Researchers have found excellent to good results with an uncemented hydroxyapatite-coated total hip implant at 11-year follow-up regarding polyethylene wear rate, stress shielding and improved design over a previous implant generation, according to results of this study.
“It is our understanding that the ABG-II (Stryker; Mahwah, N.J.) design has been a major advance in the field of cementless total hip arthroplasty, with a high implant survival after more than 11 years of follow-up,” Antonio Herrera, MD, PhD, and colleagues wrote in the study. “The changes in stem design have minimized the stress-shielding phenomenon. The introduction of the Duration (Stryker; Mahwah, N.J.) polyethylene has led to a low wear rate in the long term and thus, a lower incidence of osteolytic lesions.”
Herrera and colleagues analyzed 183 cases with a minimum 11-year follow-up in patients who underwent total hip arthroplasty (THA) with the ABG-II implant between September 1999 and December 2000, according to the abstract. In 84 cases, polyethylene zirconia was used as the bearing surface; polyethylene-metal bearings and ceramic-ceramic bearings were used in 42 cases and 57 cases, respectively.
The researchers noted that in addition to minimizing stress-shielding compared to the ABG-I (Stryker; Mahwah, N.J.), the ABG-II reduced the polyethylene wear rate by 50%. The survival rate at final follow-up was 98.39%, and excellent to good results were found in 90.32% of cases, according to the abstract.
Disclosure: The authors have no relevant financial disclosures.