کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
810802 1469114 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Failure analysis of sandwich-type ceramic-on-ceramic hip joints: A spectroscopic investigation into the role of the polyethylene shell component
ترجمه فارسی عنوان
تجزیه و تحلیل شکست نمونه های ساندویچ نوع سرامیک بر روی سرامیک مفصل ران: بررسی اسپکتروسکوپی در نقش جزء پوسته پلی اتیلن
کلمات کلیدی
آرتروپلاستی کامل لگن، سرامیک بر روی سرامیک، خزش پوشیدن، شکستگی سرامیک، طیف سنجی رامان، اختلال
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی پزشکی
چکیده انگلیسی

The mechanisms leading to systematic failure in modular acetabular components with a sandwich insertion (alumina/polyethylene/titanium) have been reconsidered in light of the newly collected Raman spectroscopic results. Raman assessments were conducted on the polyethylene shells, which belonged to a series of six failed sandwich implants with in vivo lifetimes ranging between 2 and 9 yr. With only one exception, all implants commonly showed dislodgment of the polyethylene shell during radiographic analyses prior to revision surgery. The polyethylene shell slipped out of the backing titanium shell, while always remaining integer to the ceramic liner. Four implants fractured at the ceramic liners, but their fractures occurred according to distinctly different patterns, which could be rationalized and classified. The insertion of the polyethylene layer, originally conceived to reduce the rigidity of the ceramic-on-ceramic bearing and to prevent impingement between the ceramic liner rim and the femoral neck, played a role in implant failure with its initial (asymmetric) thickness reduction due to creep deformation (eventually followed by cup rotation and backside wear). The results of the present spectroscopic investigation suggest that a simplistic failure classification of the sandwich-type implant as a “ceramic fracture failure” could be misleading and might represent a confounding factor in judging about the reliability of modern ceramic implants.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanical Behavior of Biomedical Materials - Volume 31, March 2014, Pages 55–67
نویسندگان
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