登入選單
返回Google圖書搜尋
其他書名
Classification and Retrieval Analysis
出版ASTM International, 2015
URLhttp://books.google.com.hk/books?id=5RJ4zgEACAAJ&hl=&source=gbs_api
註釋Surface topography has been suggested as a factor in fretting corrosion. The purpose of this study was to develop a method to characterize a broad range of machined smooth stems and intentionally microgrooved stems. As part of a multicenter, institutional review board-approved retrieval program, 398 stems paired with cobalt-chromium (CoCr; ASTM F75 or ASTM F90) alloy heads were collected. Stems were fabricated from CoCr or titanium-6aluminum-4vanadium (Ti-6Al-4V) alloys and were used in a metal-on-polyethylene bearing total hip device. A roundness machine (Talyrond 585, Taylor Hobson, United Kingdom) was used to quantify surface topography. Linear profiles were measured with a diamond-tip stylus capturing a 10-mm line trace. Commercial software (Ultra, Taylor Hobson, United Kingdom) was used to analyze a 1-mm representative as-manufactured region. Three parameters were calculated from the profiles: average surface roughness, amplitude, and wavelength of microgrooves (if any). Surface observations led to a classification system in which a surface had to contain a periodic pattern, a wavelength >100 ?m and an amplitude of >4 ?m to be considered microgrooved. Fifty percent (199/398) of the femoral stem taper surfaces were classified as smooth tapered stems. The remaining 50 % (199/398) femoral stem taper surfaces were classified as microgrooved tapered stems. Using multivariate analysis of covariance, implantation time (p