Fatigue Fracture in Dual Modular Revision Total Hip Arthroplasty Stems Failure Analysis and Computed Tomography Diagnostics in Two Cases

被引：46
|
作者：
Norman, Pontus [1 ]
Iyengar, Srinivasan [2 ]
Svensson, Ingrid [3 ]
Flivik, Gunnar [1 ]
机构：
[1] Lund Univ, Dept Orthopaed, Skane Univ Hosp, Lund, Sweden
[2] Lund Univ, Div Mat Engn, Lund, Sweden
[3] Lund Univ, Div Solid Mech, Lund, Sweden
来源：
JOURNAL OF ARTHROPLASTY | 2014年 / 29卷 / 04期
关键词：
modular; hip prosthesis; fatigue failure; CT; FEMORAL STEMS; COMPONENT; CORROSION; IMPLANT; REPLACEMENT; JUNCTION;
D O I：
10.1016/j.arth.2013.09.008
中图分类号：
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学（修复外科学）];
学科分类号：
摘要：
We report on two patients with fracture of a modular, tapered and distally fixed, uncemented titanium revision hip stem, not previously described. A failure analysis revealed that the cause of the fractures was the development of fatigue cracks in the mid-stem cobalt-chromium modular junction ending in corrosion-fatigue failure. No material defects or stress risers were found in any of the implants. The diameter of the mid-stem modular junction might be undersized for use in heavy and active patients. We also report a new way of detecting an undisplaced fracture at the modular junction, using the scout image from a computed tomography (CT) scan; a technique that can be used when plain radiographs are inconclusive. (C) 2014 Elsevier Inc. All rights reserved.
引用
收藏
页码：850 / 855
页数：6
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