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PEDICLE SCREWS Pedicle instrumentation generally consists of a variation of metal plates, rods and screws. The instrumentation is used to affix, fuse or align the spine by attaching screws to the vertebral pedicles. To assist attorneys representing clients injured by pedicle screws, our Information Clearinghouse will provide to members a research base on the history of this medical device and its complications. www.citizen.org /hrg/CLEARINGHOUSES/pedicle.htm   (184 words)

eMedicine - Breast Reduction, Superior Pedicle : Article by James N Long, MD The indications for superior pedicle reduction are the general indications for breast reduction, which are well-described as stigmata of macromastia. The pedicle soft tissue bulk is transposed superomedially and secured in position by intraparenchymal suturing to unify the medial (the now transposed lower pedicle border) and lateral (the thicker portion of the lateral breast flap) pillars. Orlando JC, Guthrie RH Jr: The superomedial dermal pedicle for nipple transposition. www.emedicine.com /plastic/topic149.htm   (3489 words)

Pedicle - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-31) In anatomy, the pedicle (also spelled pedicel) is the segment between the transverse process and the vertebral body. The pedicle is often used as a radiographic marker and entry point in vertebroplasty and kyphoplasty procedures. In zoology, a pedicle is a fleshy line used to attach and anchor brachiopods and some bivalve mollusks to a substrate. en.wikipedia.org /wiki/Pedicle   (161 words)

Pedicle screw, cervical screw and rod patent invention A rod for interconnecting at least two pedicle screws implanted in adjacent vertebrae of a spine and/or the rod itself includes a metal or metal alloy of substantial nickel content; and an outer layer of ceramic coating the metal such that exposure of the nickel to a patient is inhibited. The problem with conventional pedicle screws and rods is that they are relatively large, resulting in reduced degrees of freedom in terms of articulation, reduced purchase strength of the screw to the bone, reduced degrees of freedom in terms of positioning the pedicle screws, rod, and connecting means to a particular patient. Although in some embodiments of the invention the specific design details of the pedicle screws 106 and anchor seats 108 are not of significant concern, it is noted here that the anchor seats 104 may include a socket and a locking element, and the pedicle screw 106 may include a head. www.freshpatents.com /Pedicle-screw-cervical-screw-and-rod-dt20061207ptan20060276787.php   (1905 words)

[No title] The reanalysis of the meta-analysis of the literature describing experience with pedicle screw spinal systems in treating spinal fracture and degenerative spondylolisthesis found that pedicle screw spinal systems present risks and benefits that are comparable to those presented by nonpedicle screw spinal systems and noninstrumented spinal fusions. As a result, pedicle screw spinal systems intended for use in the cervical spine are excluded from this classification and reclassification and are considered postamendments class III devices for which premarket approval is required. A comment stated that the circumstances surrounding the first 510(k) clearance of a pedicle screw spinal system in January 1995, were highly suspect because, until that time, FDA consistently had found bone screws for use in the pedicles to be not substantially equivalent to the identified predicate device, the lag screws used by Dr. Harrington. www.angelfire.com /fl/screwd/reclass.html   (6623 words)

FVFG: Fibular Harvest - Wheeless' Textbook of Orthopaedics In the distal wound the pedicle is dissected free from the muscle and medium hemoclips are used. The pedicle is reflected off the proximal fibula until a large perforating lava vessel is found entering the cortex. Absorbable suture is used to bind the pedicle to the distal end of the fibula in order to prevent stripping of the pedicle during insertion into the reamed tunnel in the femoral neck. www.wheelessonline.com /ortho/fvfg_fibular_harvest   (999 words)

[No title] The complications associated with pedicle screw spinal systems during this period were comparable to those reported in the preamble to the proposed rule for pedicle screw spinal systems and the group of class II spinal devices using hooks and/or wires and noninstrumented fusions. Pedicle screw spinal systems are multiple component devices, made from a variety of materials, including alloys such as 316L stainless steel, 316LVM stainless steel, 22Cr-13Ni-5Mn stainless steel, Ti-6Al-4V, and unalloyed titanium, that allows the surgeon to build an implant system to fit the patient's anatomical and physiological requirements. Pedicle screw spinal systems for all other uses are multiple component devices, made from a variety of materials, including alloys such as 316L stainless steel, 316LVM stainless steel, 22Cr-13Ni- 5Mn stainless steel, Ti-6Al-4V, and unalloyed titanium, that allow [[Page 40041]] the surgeon to build an implant system to fit the patient's anatomical and physiological requirements. www.fda.gov /ohrms/dockets/98fr/072798b.txt   (13938 words)

Orthopaedic - Technique of C2 Pedicle Screw Fixation Pedicle screw fixation of the second cervical vertebra was first recommended by Robert Judet, in 1962. Exposure of the upper surface of the pedicle of C2 will show the orientation to be given to the pedicle screw; with sufficiently posterior fractures, it may also be possible to see the actual fracture site. Inside the pedicle, the drill must be kept well away from the vertebral artery; routing should be cephalad rather than caudad, and medial rather than lateral (Fig. maitrise-orthop.com /corpusmaitri/orthopaedic/mo68_laude/index.shtml   (1137 words)

Surgical Anatomy of the C2 pedicle The average pedicle height, width, and length measured 9.1 mm, 7.9 mm, and 16.6 mm respectively, and the medial inclination and rostrocaudal angulation averaged 35.2º and 38.8º respectively. In the 20 pedicles examined in this study, the average pedicle height, width, and length measured 9.1mm (7.4-11mm), 7.9mm (6.4-9mm), and 16.6mm (15.9-17mm) respectively, and the average medial inclination and rostrocaudal angulation measured 35.2º (29-41º) and 38.8º (22-52º) respectively (Table 1;Figure 4). Xu et al(15) in their anatomical study of the C2 pedicle reported that the average medial angulation of the pedicle was 30º and the rostral-caudal inclination was 20º cephalad to the transverse plane. www.medschool.lsuhsc.edu /neurosurgery/nervecenter/c2ped.html   (2112 words)

brachiopod morphology The pedicle valve bears all (or most) of the pedicle opening; it is the lower (therefore ventral) of the two valves. Note that the fold is in the brachial valve and the sulcus is in the pedicle valve. Slit in either one valve (the pedicle) or in both valves, whose openings are produced by gapes. paleo.cortland.edu /tutorial/Brachiopods/brachmorph.htm   (873 words)

Minimally invasive spine fusion systems Pedicle screw fixation with deep placement of rods is traditionally one area that has presented significant challenges for minimally invasive approaches, and these three systems tackle those challenges in different ways, with distinct advantages and disadvantages. Pedicle targeting is the technique of identifying the appropriate location and pathway for the screw to take in order to stay within the pedicle itself and not penetrate through the pedicle into surrounding tissue. Upon identifying the pedicle starting hole, the wire or probe is carefully advanced through the pedicle using frequent fluoroscopic confirmation as shown in figure 2. www.spine-health.com /topics/surg/mini/minimally-invasive01.html   (598 words)

Pedicle screws for spine fusion The pedicle screw, which is sometimes used as an adjunct to spinal fusion surgery, provides a means of gripping a spinal segment. However, the initial controversy has been favorably resolved and pedicle screws are now approved by the FDA for use in the lower (lumbar) spine for specific conditions. There is, however, a steep learning curve in the technique for placing the pedicle screws, and only surgeons comfortable and experienced with the technique should use them (see Figure 3 and Figure 4). www.spine-health.com /topics/surg/overview/lumbar/lumb09_ped.html   (389 words)

BioMed Central | Full text | Biomechanical effects of polyaxial pedicle screw fixation on the lumbosacral segments with ... Pedicle screw systems have been continually modified in design and implantation techniques over the past two decades to reduce the incidence of screw breakage and to improve the accessibility of connecting rod application when they are employed with polyaxial heads [17-20]. Theoretically, the combined use of pedicle screws and an interbody cage at the lumbosacral junction has the advantages of construct stabilization, lordosis restoration, and preventing screws breakage [21]. Polyaxial pedicle screw used among all constructs with an interbody cage support produces nearly equal percentage of cage contact in different sagittal alignments, and affords supplementary stabilization of the interbody cage in an event of large lordotic segments. www.biomedcentral.com /1471-2474/8/28   (4779 words)

Spine Stabilization With Pedicle Screws Complications involving nerve compression or injury associated with the placement of pedicle screws still occur in approximately 8-15% of cases. Pedicle screw fixation systems alone, or in combination with other surgical systems, may be beneficial in the care of any given patient. Instrumented rigid pedicle screw fixation systems being used for stabilization in patients with multi-level degenerative disease have, however, probably reached their zenith of use as the future portends the more rational application of flexible stabilization systems. www.burtonreport.com /InfSpine/SurgStabilPedScrews.htm   (1427 words)

Sonographic Whirlpool Sign in Ovarian Torsion -- Vijayaraghavan 23 (12): 1643 -- Journal of Ultrasound in Medicine Ovarian torsion is caused by rotation of the ovary or adnexa pedicle corresponds to the broad ligament, fallopian tube, and pedicle is the most definitive sign of ovarian torsion. www.jultrasoundmed.org /cgi/content/full/23/12/1643   (2155 words)

eMedicine - Breast Reduction, Moufarrège Total Posterior Pedicle : Article by Richard J Moufarrège, MD These pedicles were always of superior origin (at the 12-, 10-, or 2-o'clock position), lateral origin (at the 3- or 9-o'clock position), or bifid but they were never of inferior origin. Thus, the pedicle of the nipple-areola complex is composed of the entire remaining breast that extends from the lowest to the highest limit of the breast, hence the term total pedicle. The total pedicle is by no means limited to a drawing and can adapt to all sorts of incisions of preestablished drawings, yet the author favors a manner of drawing for reasons of simplicity, standardization, and, most importantly, conservation of reasonable scar length. www.emedicine.com /plastic/topic488.htm   (4384 words)

Turn of the Pedicle Screw The FDA, in 1984, classified pedicle screws as Class III devices because they considered the screws to "present an unreasonable risk of illness or injury." The FDA made one exception: in 1995 it allowed promotion of pedicle screws for treatment of spondylolisthesis (displacement of one vertebra over another). They consciously chose to implant the pedicle screws in their patients because they thought it was the best thing to do under the circumstances. While the pedicle screw litigation is, apparently, the first mass tort case claiming injury from association-sponsored education, Jacobs also points out that there have been other tort cases against associations, and most have failed. meetingsnet.com /medicalmeetings/meetings_turn_pedicle_screw/index.html   (3199 words)

Percutaneous Vertebroplasty in Metastatic Disease: Transpedicular Access and Treatment of Lysed Pedicles--Initial ... For correct localization, it is important that the spinous process is aligned in midline and that the visible pedicle projects exactly between the superior and inferior endplate. pedicle, the bevel was oriented externally (Fig 2). Pedicle lysis is common in metastatic disease of the spine, radiology.rsnajnls.org /cgi/content/full/229/2/593   (3384 words)

Los Angeles Pedicle Breast Reduction There are two ways to move the nipple up: a Free Nipple Graft, where the nipple is temporarily removed from the breast, and the Pedicle Method which leaves a portion of the nipple attached but still allows the physician to reposition it. The Pedicle Method is a procedure that minimizes nipple trauma and scarring. Instead of removing the entire nipple like a Free Nipple Graft, the Pedicle Method leaves a portion of the nipple attached to the breast skin, blood vessels and milk ducts. www.losangelesbreastreduction.com /method-pedicle.cfm   (398 words)

Calcium and Protein Kinase C Regulate the Actin Cytoskeleton in the Synaptic Terminal of Retinal Bipolar Cells -- Job ... of the pedicle (expressed as a percentage of the mean radius) in the dark and light. was a growth of actin filaments in the synaptic pedicle. The bar chart plots the mean depth of the actin network in the synaptic pedicle of bipolar cells depolarized for 15 min in Ringer's solution containing 50 mM KCl with 2.5 mM Ca and either 0.1% DMSO vehicle, 30 µM nifedipine, or 100 µM nifedipine. www.jcb.org /cgi/content/full/143/6/1661   (7773 words)

The Synaptic Architecture of AMPA Receptors at the Cone Pedicle of the Primate Retina -- Haverkamp et al. 21 (7): 2488 ... The Synaptic Architecture of AMPA Receptors at the Cone Pedicle of the Primate Retina The cone pedicle diameter of the macaque retina varies between 6 µm close to the fovea and 10 µm in peripheral retina. The density of pedicles decreased from a peak www.jneurosci.org /cgi/content/full/21/7/2488   (8038 words)

Cosmetic Surgery Times: Inferior central pedicle technique bolsters breast reduction - Breast   (Site not responding. Last check: 2007-10-31) Because he preserves this pedicle, he explained, "Most of my patients have good sensation of the nipple, which is important not only for [breast-feeding] but also because nipple sensation is an important part of a woman's sexuality." The superior medial pedicle technique, on the other hand, can be effective when one doesn't have to move the areola more than 7 cm or 8 cm. And you have to be careful not to undermine the pedicle, which is somewhat easy to do." To avoid this problem, he advised surgeons to use caution when removing lateral and medial tissue. www.findarticles.com /p/articles/mi_m0HMW/is_10_6/ai_111304115   (825 words)

► Pedicle The brain has many pedicles (such as cerebral pedicle or middle cerebellar pedicle) that connects parts of the brain to another part of the brain. Skin tags (cutaneous tags) are small pieces of skin tissue that connect to the body with a pedicle. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. www.umm.edu /ency/article/002285.htm   (131 words)

Phylum Brachiopoda Fixed to the substrate by a pedicle, or by the cementation of one valve to the substrate itself, or burrowing with an elongated pedicle sheathed in sand. Dorsal (brachial) and ventral (pedicle) valve, with fine ornamentations (ridges, spines), to which the dorsal and ventral mantle lobes are attached. The space between the pedicle and the hinge is called delthryum. www.rtis.com /nat/user/elsberry/taxa/brach.html   (1625 words)

To Screw or Not to Screw: The Pedicle Question - Common Back Surgery Device Not FDA Approved The rods are connected to the pedicles of a second vertebra by means of another set of pedicle screws, straightening or strengthening the spine. FDA Response: Pedicle screws have largely replaced other methods of spine stabilization such as wires, rods and hooks in the 30-70,000 spine stabilization procedures performed annually in the U.S. About 300,000 people have been implanted with the screws. FDA Response: Patients considering back surgery in which pedicle screws might be used to stabilize the spine should keep in mind that these devices have not been approved for this purpose, and that FDA cannot assure that they are safe and effective. www.chiroweb.com /archives/12/10/20.html   (957 words)

"Ovarian Vascular Pedicle" Sign Revealing Organ of Origin of a Pelvic Mass Lesion on Helical CT -- Lee et al. 181 (1): ... Axial single-detector helical CT was performed from common iliac vessels to left ovarian vascular pedicle. pedicle and ovarian hilum in the detection of torsion of an CT scan shows left ovarian vascular pedicle (arrow) discontinuous with tumor in ovarian hilum in that ovarian pedicular vessels appear "floating" within ovarian hilum. www.ajronline.org /cgi/content/full/181/1/131   (3441 words)

Increased vascular pedicle width preceding burn-related pulmonary edema -- Haponik et al. 90 (5): 649 -- Chest Increased vascular pedicle width preceding burn-related pulmonary edema Widening of the vascular pedicle on the chest roentgenogram is a recently pedicle is associated with early burn-related pulmonary edema and might www.chestjournal.org /cgi/content/abstract/90/5/649   (301 words)

Pedicle   (Site not responding. Last check: 2007-10-31) A pedicle is a stem or stalk of tissue that connects parts of the body to each other. The brain has many pedicles (such as cerebral pedicle or middle cerebellar pedicle) that connect areas of the brain to each other. Skin tags are small pieces of skin tissue that connect to the body with a pedicle. www.shands.org /health/information/002285.htm   (129 words)

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