دانلود رایگان مقاله لاتین پارگی پیچ ساقه از سایت الزویر
عنوان فارسی مقاله:
پارگی پیچ ساقه: مطالعه موردی
عنوان انگلیسی مقاله:
Pedicle screw rupture: A case study
سال انتشار : 2015
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مقدمه انگلیسی مقاله:
1. Introduction
The person involved in this clinical case, named here simply as the ‘‘patient’’, was suffering with intense pains in the lumbar region of his dorsal spine. Clinical treatments were used with no results, resulting in the surgical action in order to insert a prosthetics linking two adjacent vertebras, so as to eliminate the effect of a broken connection between these vertebras. After about six months from the surgical intervention, the patient was suffering again by intense pains in the region where the prosthetic was implanted. X-rays and Tomography revealed the rupture of a screw and attached connecting bar. A new surgical intervention was done to substitute the prosthetic. The patient sued the company responsible for the prosthetic material, claiming a certain amount for both physical and psychological discomfort. Some articles have related features of surgeries and instrumentation used. Intravertebral and intrapedicular pedicle screw bending moments were studied by [1] as a function of sagittal insertion angle. The influence of various parameters on the failure of fixation systems due to the pull-out phenomenon of the fixation screws was explored by [2] through a finite element model of the human lumbar vertebral bone and of the transpedicular fixation screw with the design simulation based on the main characteristics of commercial fixation pedicle screws. The goal of the De Marco et al.’s study [3] was to evaluate thoracic and lumbar pedicle screws placement to treat a variety of spinal disorders, where these screws were inserted using intra operative anatomical and fluoroscopic parameters. Daher et al. [4] investigated if the number of pedicular screw (screw density) within the major curve correlates with the curve correction in the surgical treatment of neuromuscular scoliosis and also compared the correction of the major curveand pelvic obliquity using Luque–Galveston instrumentation and pedicle screw constructs in the treatment of neuromuscular scoliosis [5]. Masson et al. [6] had analyzed experimentally the early alterations of the bone-screw interface with tapping techniques in the cancellous bone of the cervical vertebrae. Vendrame et al. [7] had accessed microscopically bone tissue changes between vertebral bone and implant interface, whose pilot hole was prepared using probe, drill and drill followed by tapping. A prospective, randomized clinical study was performed by [8] to determine whether unilateral pedicle screw fixation was comparable with bilateral fixation in 1- or 2-segment lumbar interbody fusion. Other literatures have described typical analysis methods adopted to evaluate materials and failures on pedicle screw. Chen et al. [9] had investigated the pedicle screw breakage by conducting retrieval analyses of broken pedicle screws from 16 patients clinically and by performing stress analyses in the posterolateral fusion computationally using finite element (FE) models, when fracture surface of screws was studied by scanning electron microscope (SEM). La Torre et al. [10] had estimated inner forces acting on lumbar spine during activity of lifting objects. After that, using inverse dynamics method the resulting joint between L5/S1 and resulting muscle forces were calculated. The three basic concepts that are important to the biomechanics of pedicle screw based instrumentation were described by [11], where they are: first, the outer diameter of the screw determines pullout strength, while the inner diameter determines fatigue strength; secondly, when inserting a pedicle screw, the dorsal cortex of the spine should not be violated and the screws on each side should converge and be of good length; and thirdly, fixation can be augmented in cases of severe osteoporosis or revision. A research done to determine the cause of a broken titanium pedicle screw supporting a prosthesis inserted to repair a broken spinal vertebra in a 38 year old patient was reported by [12]. Siskey et al. [13] had been performed mechanical tests based on the standard ASTM-F1717 protocol, with the exception that displacement control(as opposed to load control)to evaluate the fatigue performance of PEEK spinal fusion rod systems. Yust [14] had compared a clinically applicable method of testing pedicle screw failure in human cadaver osteoporotic vertebrae to previously studied synthetic bone. Chang [15] presented a short description about stages of a mechanical failure analysis of a broken bolt, highlighting these stages: (1) character; (2) setting; (3) plot; and (4) conflict. Fakhouri et al. [16] had compared, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. Kueny et al. [17] had determined the fixation strength of three current osteoporotic fixation techniques and had investigated whether or not pullout testing results can directly relate to those of the more physiologic fatigue testing. In Williams and Chawla [18], fractography of a failed Profemur Z implant showed that a life limiting fatigue crack was nucleated on the anterolateral surface of the implant(tm)s neck. In Cetin et al. [19], effects of the pedicle screws angled fixation to the rod on the mechanical properties of fixation were investigated.
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کلمات کلیدی:
Delayed perforation of the aorta by a thoracic pedicle screw - NCBI - NIH https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC) by B Wegener - 2008 - Cited by 59 - Related articles Jul 10, 2008 - Pedicle screw instrumentation has become increasingly popular during ... Beyond mechanical limitations of spinal motion, nerve injury can lead ... Complications associated with thoracic pedicle screws in spinal ... https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC) by G Li - 2010 - Cited by 51 - Related articles Mar 17, 2010 - All dural tears were seen while preparing the concave side of the thoracic pedicles for screw insertion using a small curette. Dural tear was ... A retrospective analysis of pedicle screws in contact with the great ... https://www.ncbi.nlm.nih.gov/pubmed/20809738 by KC Foxx - 2010 - Cited by 34 - Related articles OBJECT: Pedicle screws placed in the thoracic, lumbar, and sacral spine ... that screws placed in contact with major vessels do not always result in vessel injury. Misplaced pedicle screws by the freehand technique: what is the real ... www.scielo.br/scielo.php?pid=S1808-18512013000400011&script=sci...tlng... by MH Galindo - 2013 - Related articles CONCLUSION: A high level of pedicle screw cortical violation was observed. ... of the pedicle screws regarding the presence of pedicular cortical injury due to ... Pullout characteristics of percutaneous pedicle screws with different ... www.jvir.org/article/S1877-0568(15)00056-0/pdf Percutaneous pedicle screw augmentation. Elderly spine. Cement distribution. Rupture pattern. a b s t r a c t. Background: Vertebroplasty prefilling or fenestrated ... Lateral Access Minimally Invasive Spine Surgery https://books.google.com/books?isbn=3319283200 Michael Y. Wang, Andrew A. Sama, Juan S. Uribe - 2016 - Medical 26.3.9 Intraoperative Vertebral Endplate Injury Endplate injuries recognized ... early postoperative imaging warrants pedicle screw fixation to reduce subsidence. Searches related to Pedicle screw rupture pedicle screws problems pedicle screws complications thoracic spinal fusion complications
