Characteristics of Unicortical and Bicortical Lateral Mass Screws in the Cervical Spine

Seybold, Eric A.; Baker, Jeffrey A.; Criscitiello, Arnold A.; Ordway, Nathaniel R.; Park, Choon‐Keun; Connolly, Patrick J.

doi:10.1097/00007632-199911150-00018

Cited by 83 publications

(45 citation statements)

References 37 publications

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“…This is in major agreement with the results by Seybold and co-workers, who did not see any influence of the length of the burr hole on pullout force [25]. Jones et al also did not see a significant correlation between length of the burr hole and pullout force [8].…”

Section: Comparison With Former Studiessupporting

confidence: 91%

“…Jones placed screws according to An, which resulted in a mean pullout force of 355 N [8]. Seybold found a mean pullout force of 519 N if screws were fixed unicortically and 562 N of screws were fixed bicortically according to the Magerl technique [25]. The mean pullout force for a cervical spine facet screw of 3.5-mm diameter, which was placed bicortically without PMMA, was found to be 382.8 N (±140.5 N) in the current study.…”

Section: Comparison With Former Studiesmentioning

confidence: 99%

“…The current study therefore gives important information about the importance of bone density for facet screw fixation: a positive, albeit moderate, correlation was found for both torque and pullout vs bone mineral density of the facets for the configuration without cement and after complete filling with cement. It is possible that the results reflect more the effect of bicortical fixation rather than the importance of bone density; however, Seybold et al showed that engaging the anterior cortical shell did not increase pullout forces when compared with monocortical fixation [25]. Additionally, a study dealing with this topic in anterior spine fixation has recently been published.…”

Section: Comparison With Former Studiesmentioning

confidence: 99%

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Factors affecting the interface of cervical spine facet screws placed in the technique by Roy-Camille et al.

et al. 2004

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Section: Comparison With Former Studiessupporting

confidence: 91%

Section: Comparison With Former Studiesmentioning

confidence: 99%

Section: Comparison With Former Studiesmentioning

confidence: 99%

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Factors affecting the interface of cervical spine facet screws placed in the technique by Roy-Camille et al.

et al. 2004

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“…Several options are available for the treatment of atlantoaxial instability. 2,4,[6][7][8]13,15,16,18,19,21,22,24) Favorable results are obtained with most surgical procedures. The outcome of surgery depends on the surgeon's experience and the type of surgical procedure that is used.…”

Section: Introductionmentioning

confidence: 99%

“…14) A transarticular screw fixation technique, in combination with C1-2 posterior wiring, was introduced in 1979, 17) and has been widely adopted for the correction of atlantoaxial dislocations. 2,4,[6][7][8][9]13,15,16,18,19,21,22,24) The pseudoarthrosis rate is negligible for this technique, 7,13) but a high degree of technical experience is required to perform the procedure. Furthermore, surgical planning using a neuronavigator system is necessary for safe and secure transarticular screw insertion.…”

Section: Introductionmentioning

confidence: 99%

Interlaminar Fixation Using the Atlantoaxial Posterior Fixation System (3XS System) for Atlantoaxial Instability: Surgical Results and Biomechanical Evaluation

Nishizawa

Yamaguchi

Matsuzawa³

2004

Neurol. Med. Chir.(Tokyo)

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This study evaluated the surgical results for patients with atlantoaxial instability due to various lesions treated using the atlantoaxial posterior fixation system (3XS system; Kisco DIR, Paris, France), together with a biomechanical study of this system. The strength of the 3XS system during torsion was examined using a biomechanical simulation model. The 3XS system consists of a transverse unit, hooks, and rods. The lower part of the biomechanical simulation machine was rigidly fixed and the upper part was movable, allowing torsion to be applied until the point of failure. The test was started at 1.5 newtonmeters, thought to be the maximum load on the upper cervical spine. The 3XS system tolerated torsion of up to 20 newton-meters, but became deformed. The instrument was fractured at 30 newton-meters. Fifteen patients, four with atlantoaxial instability, seven with os odontoideum, and four with odontoid fractures, underwent surgery using the 3XS system and an iliac bone fragment inserted between the C-1 and C-2 laminae. Postoperative rigid fixation of the lesion and optimal cervical alignment was obtained in all patients, and the patients were discharged within 2 weeks after surgery. Follow-up radiography showed bony fusion between C-1 and C-2 in all patients. Posterior fixations between C-1 and C-2 using the 3XS system were easy to perform and no surgical complications were encountered. The biomechanical study showed the 3XS system can tolerate torsions unlikely to occur during rotation movements in the atlantoaxial region in humans. The surgical use of the 3XS system for the treatment of atlantoaxial instability has several advantages.

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Basic research methods and current trends of dental implant surfaces

et al. 2008

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Among dental implant design alterations, surface modifications have been by far the most investigated topic. Regarding implant surface research, the lack of hierarchical approaches relating in vitro, in vivo, clinical trials, and ex vivo analyses has hindered biomaterials scientists with clear informed rationale guidelines for implant surface design. This manuscript provides a critical hierarchical overview of the in vitro, laboratory in vivo, clinical, and ex vivo methodologies used to investigate the performance of novel biomaterials aiming to allow dental professionals to better evaluate the past, present, and future dental implant surface research. This manuscript also contains an overview of the commercially available surface texture and chemistry modifications including novel nanotechnology-based fabrication processes. Over the last decade, surface texturing has been the most utilized parameter for increasing the host-to-implant response. Recently, dental implant surfaces utilizing reduced length scale physico/chemical features (atomic and nanometric) have shown the potential to synergistically use both texture and the inclusion of bioactive ceramic components on the surface. Although surface modifications have been shown to enhance osseointegration at early implantation times, information concerning its long-term benefit to peri-implant tissues is lacking due to the reduced number of controlled clinical trials. Given the various implants/surfaces under study, the clinician should ask, founded on the basic hierarchical approach described for the in vitro, laboratory in vivo data, as well as the results of clinical studies to effectiveness before use of any dental implant.

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Characteristics of Unicortical and Bicortical Lateral Mass Screws in the Cervical Spine

Abstract: Fourteen-millimeter lateral mass screws (effective length, 11 mm) placed in a superolateral trajectory in the adult cervical spine provide an equivalent strength with a much lower risk of injury than the longer bicortical screws placed in a similar orientation.

Cited by 83 publications

References 37 publications

Factors affecting the interface of cervical spine facet screws placed in the technique by Roy-Camille et al.

Factors affecting the interface of cervical spine facet screws placed in the technique by Roy-Camille et al.

Interlaminar Fixation Using the Atlantoaxial Posterior Fixation System (3XS System) for Atlantoaxial Instability: Surgical Results and Biomechanical Evaluation

Basic research methods and current trends of dental implant surfaces

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