tailieunhanh - báo cáo hóa học:" Fatigue strength of common tibial intramedullary nail distal locking screws"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học quốc tế đề tài : Fatigue strength of common tibial intramedullary nail distal locking screws | Journal of Orthopaedic Surgery and Research BioMed Central Research article Fatigue strength of common tibial intramedullary nail distal locking screws LannyV Griffin 1 Robert M Harris2 and Joseph J Zubak3 Address California Polytechnic State University Biomedical and General Engineering San Luis Obispo CA USA 2Director of Orthopaedic Trauma Holston Valley Medical Center Wellmont Health System Kingsport TN USA and 3Shannon Clinic Southwest 4550 Sunset Dr. San Angelo TX USA Email Lanny V Griffin - lgriffin@ Robert M Harris - robert_m_harris@ Joseph J Zubak - jjzubak@ Corresponding author Open Access Published 16 April 2009 Received 25 September 2008 Journal of Orthopaedic Surgery and Research 2009 4 11 doi 1749-799X-4-1 1 Accepted 16 April 2009 This article is available from http content 4 1 11 2009 Griffin et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background Premature failure of either the nail and or locking screws with unstable fracture patterns may lead to angulation shortening malunion and IM nail migration. Up to thirty percent of all unreamed nail locking screws can break after initial weight bearing is allowed at 8-10 weeks if union has not occurred. The primary problem this presents is hardware removal during revision surgery. The purposes of our study was to evaluate the relative fatigue resistance of distal locking screws and bolts from representative manufacturers of tibial IM nail systems and develop a relative risk assessment of screws and materials used. Evaluations included quantitative and qualitative measures of the relative performance of these screws. Methods Fatigue tests were conducted to simulate a comminuted fracture that