ASSESSMENT OF SPINAL IMPLANTS UNDER CYCLIC LOADING
Journal Title: Journal of Turkish Spinal Surgery - Year 1993, Vol 4, Issue 3
Abstract
An experimental technique is developed to study the transfer of load through spinal Instruments when subjected to cyclic loading. İn this study two series of tests are conducted on in vitro calf spines comprising of three vertebrae. First series consists of testing intact vertebrae without instrument cyclically (cross head speed 50 mm/minute). The change of stiffness is studied both in short and long period of loading. Second series of testing are performed on fractured and instrumented vertebrae. İn order to asses the power of cor-rection of the spinal instrument the change in the participation factor of the vertebra is studied. For this pur-pose a model is developed to simulate the burst fracture where the transected vertebral body is replaced by a plastic spacer with a certain elasticity. Furthermore, strain gages were placed to the Central parts of the posterior rods. The load carried by this setup is designated as Ps. This model, in the presence of spinal Instruments are then tested under the aforementioned loading and the load carried is called as Pappi- At the end of tests axial stiffens versus load curves drawn at the end of quasi-static tests supply the necessary preliminary information for the adequate prediction of the behavior of vertebrae (intact and/or instrumented) under cyclic loading. Alıcı and TSRH spinal 'Instruments are compared with respect to the additional stiffness supplied by the ‘Instruments and with respect to the participation factor (Participation factor of the instrument = 1 - Ps/Pappi) of the instrument. Results of the experiments indicate that Alıcı spinal instrument, under axial cyclic loading can compete favorably well with the other two 'Instruments.
Authors and Affiliations
Gülin BİRLİK, Feza KORKUSUZ, Ozan AKKUŞ, Nuri AKKAŞ
Keywords
Related Articles
- EP ID EP676232
- DOI -
- Views 162
- Downloads 0
INCIDENCE OF RADIOGRAPHICALLY-DETECTED LUMBAR REGION ANOMALIES IN A YOUNG MALE POPULATION.
Spina bifida occulta (SBO), transitional vertebral anomalies such as lumbarization and sacralization, and scoliosis, are structural and functional anomalies that can be detected during radiological evaluation of the lumb...
ANALYSIS OF ILIOLUMBAR LIGAMENT ON LUMBOSACRAL TRANSITIONAL ANOMALIES
Objective: Our aim is to understand if there is a relationship about the numbering of LSTV with iliolumbar ligament or not. Materials and Method: We inspected 350 lumbar MRI. Any pathologies or traumatic injuries...
MEASUREMENT OF ANTERIOR ATLANTODENTAL INTERVAL IN ADULTS WITH COMPUTERIZED TOMOGRAPHY
Objective: The aim of this study is to determine the normal value range of the anterior atlantodental interval in adults. Materials and Methods: 100 adult patients (50 females and 50 males), who had no trauma in t...
EFFECT OF INDUCED HYPOTENSION AND TOTAL INTRAVENOUS ANESTHESIA (TIVA) ON BLOOD LOSS DURİNG VVAKE-UP TEST İN SPINAL SURGERY
Although spinal surgery carries a risk of neurological complicatiorı of less than 1 percent, the resulting disabili-ty is so devastating that it necessitates monitoring to avoid permanent injury. İn spinal surgery, perop...
ANTERİOR DECOMPRESSION AND STRUT GRAFTING FOR OSTEOPOROTIC BURST FRACTURES WITH NEUROLOGIC DEFICIT, AND OPEN KYPHOPLASTY TO ADJACENT VERTEBRAE.CASE REPORT
Main indication for kyphoplasty which is very popular treatment recently, is painful compression fractures. İn the osteoporotic burst fractures that have retropulsed bone fragment in spinal canal with severe posterior wa...