Fixation of Non-Cemented Total Hip Arthroplasty Femoral Components in a Simulated Proximal Bone Defect Model

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• 作者：Sophia N. Sangiorgio ; Edward Ebramzadeh ; Ashleen R. Knutsen ; Sean L. Borkowski ; Jeremy J. Kalma ; Benjamin C. Bengs
• 关键词：non-cemented arthroplasty ; fixation ; revision arthroplasty ; bone defect ; bone loss ; micromotion
• 刊名：The Journal of Arthroplasty
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：28
• 期：9
• 页码：1618-1624
• 全文大小：1469 K

文摘

An accelerated sequential proximal femoral bone loss model was used to measure the initial stability of three noncemented femoral stem designs: fully porous-coated, proximally porous-coated, and dual-tapered, diaphyseal press-fit (N = 18). Only dual-tapered, diaphyseal press-fit stems remained stable with as much as 105 mm of bone loss, with average cyclic micromotion remaining below 25 ¦Ìm in ML and below 10 ¦Ìm in AP planes. In contrast, with proximally coated and fully coated stem designs with circular or oval cross-sections, 60 mm of bone loss, resulting in lower than 10 cm of diaphyseal bone contact length, led to gross instability, increasing average cyclic micromotions to greater than 100 ¦Ìm prior to failure. Therefore, the results provide support for using a dual-tapered stem in revision cases with proximal bone loss.