Using pin-mounted markers in the cadaveric Greyhound crus and talus, a closed-form solution of absolute orientation was used to identify, on radiographs, the lateral and medial locations of the transverse axis by tracking the 3D excursions of the markers during flexion and extension. These screw mechanisms are connected through a magnetic clutch to a speed reduction gear and an accurately controllable prime motive source. Before ultrasonic cleansing of old, used implant screws , there was a large amount of debris accumulation and corrosion products. Many studies are available comparing different atlantoaxial stabilization techniques, but none of them compared the techniques to fix the contralateral side while using the transarticular screw on one side. A novel method for defining the Greyhound talocrural joint axis of rotation for hinged transarticular external skeletal fixation. Clinical and radiographical evaluation was performed regarding the lesion, concomitant injury, duration of the surgery, time to first use of the limb, fixator removal time, complications and clinical outcomes. This type of metal fatigue appears to be the most common cause of structural failure.

Revision surgery was not necessary in any of the patients. To describe outcome after transarticular facet screw stabilization and dorsal laminectomy for treatment of dynamic degenerative lumbosacral stenosis DLS in 26 dogs. New application of springs increases reliability of equipment in which ball screws commonly used. The average radiation dosing due to intraoperative imaging was The web has at least one flat vertical wall surface which is designed to contact a generally flat vertically extending wall surface tab of the bolt head. Using two lag screws is considered. To determine alterations in joint loading, kinematics, and instrumentation stresses in the craniovertebral junction after application of a novel instrumentation system. This study constitutes the first report of a tortuous vertebral artery causing the partial destruction of a C 1 – C 2 facet complex, as well as instability, with the clinical presentation of severe occipital headache.

In cadavers, C 1 – C 2 extension did not differ: Time to fixator removal ranged from 57 to 90 days with a median of 73 days. The cohort was divided into 2 groups by fixation method: Three-dimensional flexibility tests were performed on the specimens while intact, following simulated dens fracture, and following application of the halo-vest alone, odontoid screw alone, and halo-vest and screw combined.

Lumbosacral LS intervertebral disc IVD spaces were measured on pre and postoperative 6-week and 6-month radiographs.

The thread number had no effect. Retrospective CT imaging study. Internal rotation was significantly less in specimens fixed with eipsode screws. Both maximum force and plateau value increase drastically in the presence of cement. This article presents a novel surgical technique in the management of open complete talocrural luxations and evaluates the results, and clinical benefits with its routine clinical utilization.


One hundred and twenty-two female patients feet who underwent a distal chevron osteotomy as part of a distal soft-tissue procedure for the treatment of symptomatic unilateral moderate to severe hallux valgus constituted the study cohort.

Published by Elsevier Inc. The preliminary results showed that this technique was effective in strengthening the rotational stability of the atlantoaxial fixation and was considered useful for atlantoaxial posterior stabilization. Biomechanical analysis comparing three C 1 wpisode C 2 transarticular screw salvaging fixation techniques.

A total of 22 plates were placed, and all 44 screws were inserted into the atlas lateral masses. This represents the first report of C transarticular screw fixation for the treatment of arthropathy-associated occipital neuralgia.

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On the other hand, translaminar screws are considered to be safer for patients with anomalous VA. To describe clinical outcome and technical outcome assessed using computed tomography CT in dogs with degenerative lumbosacral stenosis DLSS treated by dorsal laminectomy, partial discectomy, and transarticular screw fixation. Angular screw motion ” screw toggling” within the vertebra was measured with a 3D motion analysis system every cycles and by stress fluoroscopy every cycles.

Effects of abutment screw coating on implant preload. This technique is recommended in patients who require insertion of a new screw.

Dogs were divided into 2 groups–group 1: Effect of screw position on load transfer in lumbar pedicle screws: A conical feeder is attached to a vertically conveying screw auger. All animals except the one with a neurological defect had an early return to weight bearing. Purpose To assess the feasibility and safety of occipital condyle OC -based occipitocervical fixation OCF in Indians and to define anatomical zones and screw lengths for safe screw placement.

Methods Fourteen cadavers were serially intubated using force-sensing Macintosh and Airtraq laryngoscopes in random order, with simultaneous cervical spine motion recorded with lateral fluoroscopy. A finite element investigation of upper cervical instrumentation. Direct measurement of particle-phase amine emission from coal and biomass burning showed that coal burning is an important atmospheric amine source, considering coal burning is top-ranked particulate matter source in China.

Consideration of both load conditions is essential. While the slot for the upper lag screw might be advantageous with regard to the stresses in the lag screwsit could be detrimental for cut-out occurring adjacent to the lag screws.


The current options are C1 lateral vieo screw and short C2 pedicle screw or C1 lateral mass screw and C2 intralaminar screwor C 1 – C 2 sublaminar wire. There were no significant differences in stiffness between anterior and posterior transarticular screw techniques, unless cable fixation was added to the posterior construct.

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Originally developed to position precisely interferometer retroreflector for airborne measurement of solar infrared radiation, did now has positioning accuracy dhaska 0. Preoperatively, the bone image on computed tomography was analyzed and the trajectories of the screws were designed in 3-dimensional format. Nine fresh human cervical spines with intact ligaments C0-C4 were subjected to pure moments in the 6 loading directions.

Retrospective review of patients who sustained unstable atlas fractures treated with polyaxial lateral mass screw -plate construct. Shock-Absorbent Ball- Screw Mechanism. Functional outcomes were evaluated in the form of visual analog scale for neck pain, neck stiffness, patient satisfaction, and Neck Disability Index. At least one screw episoee located within the interior space of the hopper and includes a screw diameter in the width direction that is less than or equal to the gap distance.

Medially, the cord and canal contents are at risk. All owners perceived their dog’s ability to walk, run, and jump after surgery to be improved. There was no screw or plate loosening or breakage in any patient. In terms of functionality, Constant score was Odontoid fractures are a common injury pattern in the elderly.

In vitro biomechanical chaskz of equine proximal interphalangeal joint arthrodesis techniques: Polyurethane foams, whose density is close to that of cancellous bone, were used as bone model. Clinical improvement was seen in 13 dogs, 2 dogs had intermittent LS pain, and 2 dogs needed revision surgery. Many studies are available comparing epieode atlantoaxial stabilization techniques, but none of them compared the techniques to fix the contralateral side while using the transarticular screw on one side.