نتایج جستجو برای: pullout resistance

تعداد نتایج: 375882  

Journal: :Proceedings of the Japan Society of Civil Engineers 1980

Journal: :BMC Musculoskeletal Disorders 2009
Wen-Chi Tsai Po-Quang Chen Tung-Wu Lu Shing-Sheng Wu Kao-Shang Shih Shang-Chih Lin

BACKGROUND This study was designed to derive the theoretical formulae to predict the pullout strength of pedicle screws with an inconstant outer and/or inner diameter distribution (conical screws). For the transpedicular fixation, one of the failure modes is the screw loosening from the vertebral bone. Hence, various kinds of pedicle screws have been evaluated to measure the pullout strength us...

2018
Gorkem Kiyak Tevfik Balikci Ahmed Majid Heydar Murat Bezer

Study Design Mechanical study. Purpose To compare the pullout strength of different screw designs and augmentation techniques in an osteoporotic bone model. Overview of Literature Adequate bone screw pullout strength is a common problem among osteoporotic patients. Various screw designs and augmentation techniques have been developed to improve the biomechanical characteristics of the bone-...

Journal: :Orthopedics 2015
Jennifer S Barr Jedediah K White Stephanie E W Punt Ernest U Conrad Randal P Ching

The effect of simulated early weight bearing on both micromotion and pullout strength of uncemented distal femoral stems was evaluated in this study. The effect of stem endosteal contact and bone quality on implant pullout strength was also analyzed. A randomized matched-pair study was performed using 8 bilateral pairs of fresh human cadaveric femoral specimens. Each specimen pair was dual-ener...

Journal: :Medical engineering & physics 2010
Panagiotis E Chatzistergos Evangelos A Magnissalis Stavros K Kourkoulis

The present study aims to the design of a finite-element model simulating accurately the pullout behaviour of cylindrical pedicle screws and predicting their pullout force. Three commercial pedicle screws, subjected to pure pullout from synthetic bone, were studied experimentally. The results were used for the design, calibration and validation of a finite-element model. Special attention was p...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید