ABSTRACT
The purpose of this study was to determine the incidence of heterotopic ossifications (HOs) after total hip arthroplasty in Japanese patients and the predisposing factors associated with this condition. One thousand hips of 885 patients undergoing cementless total hip arthroplasties were examined with respect to the incidence and severity of HO; the data analysis was conducted by using the univariate and multivariate methods. The overall incidence of HO was 5.2%, with severe HO in 0.9% of the patients. A significant increase in the frequency of HO was observed in patients with ankylosed hips (odds ratio, 11.1; 95% confidence interval, 2.5-49.9), hypertrophic osteoarthritis (odds ratio, 2.7; 95% confidence interval, 1.2-5.9), and with a particular type of prosthesis used (ceramic-on-ceramic vs ceramic-on-polyethylene) (odds ratio, 2.5; 95% confidence interval, 1.3-4.8).
Subject(s)
Arthroplasty, Replacement, Hip , Ossification, Heterotopic/epidemiology , Postoperative Complications/epidemiology , Adult , Aged , Aged, 80 and over , Female , Humans , Incidence , Japan/epidemiology , Logistic Models , Male , Middle Aged , Osteoarthritis, Hip/surgery , Range of Motion, Articular , Reoperation , Risk Factors , Severity of Illness IndexABSTRACT
This study was designed to elucidate the erosive effect of hydrogen peroxide solutions on the materials used for total-hip arthroplasty (THA). As test materials, cross-linked polyethylene, Ti-6Al-4V alloy, and thermal sprayed hydroxyapatite (HA) were used. Changes upon soaking in 3% hydrogen peroxide, before soaking, 1 minute after soaking, 10 minutes after soaking, and 180 minutes after soaking were examined. Scanning electron microscope, Fourier transform infrared analysis, and x-ray diffraction were used for this examination. Hydrogen peroxide did not affect polyethylene, although notable changes in the Ti-6Al-4V alloy and HA did occur. These results indicate that caution should also be exercised to minimize erosion of prosthesis consisting of HA and Ti alloy when hydrogen peroxide solutions are used during total-hip arthroplasty.
