Comparison of the biomechanical properties of a ventral cervical intervertebral anchored fusion device with locking plate fixation applied to cadaveric canine cervical spines

Schöllhorn, Bernhard; Bürki, Alexander; Stahl, Christina; Howard, Judith; Forterre, Franck

doi:10.1111/j.1532-950x.2013.12044.x

Cited by 22 publications

(32 citation statements)

References 29 publications

(62 reference statements)

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“…Multiple sizes of the cage are available, but only the smallest size (curved, C 4.5) was appropriate for the large‐breed dogs in our study. Dogs have a natural lordotic position that increases the risk of ventral extrusion of intervertebral implants from shearing forces, and ventral fixation and stabilization are often required to prevent ventral dislodging of the intervertebral implants . Dog 4, however, presented with ASD (adjacent segment pathology with clinical signs) at 30 months after the initial surgery, and two stand‐alone cages were placed in the adjacent intervertebral discs.…”

Section: Discussionmentioning

confidence: 99%

“…Dogs have a natural lordotic position that increases the risk of ventral extrusion of intervertebral implants from shearing forces, and ventral fixation and stabilization are often required to prevent ventral dislodging of the intervertebral implants. 27 Dog 4, however, presented with ASD (adjacent segment pathology with clinical signs) at 30 months after the initial surgery, and two stand-alone cages were placed in the adjacent intervertebral discs. Radiographs at 6 weeks postoperatively revealed stable presentation of the implants and bony fusion on the ventral side of the vertebral bodies of C4 to C7; the dog was still alive at the time of writing and had clinically improved.…”

Section: Discussionmentioning

confidence: 99%

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Instrumented cervical fusion in nine dogs with caudal cervical spondylomyelopathy

et al. 2019

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Objective To report the long‐term outcome of nine dogs treated for caudal cervical spondylomyelopathy (CCSM) with surgical spinal fusion. Study design Short case series. Animals Nine large‐breed dogs. Methods Medical records of dogs treated for disc‐associated CCSM (2013‐2016) were reviewed. The surgery objective was spinal distraction by implantation of a SynCage and fixation with two Unilock plates. Follow‐up included the Helsinki pain score questionnaire, neurological grading, radiography, computed tomography (CT), and micro‐CT (μCT) with subsequent histopathology (two dogs). Results Clinical follow‐up was obtained between 9 and 51 months (27.4 ± 13.4 months). The Helsinki pain score and neurological Griffith score improved (P < .01) in all dogs and in eight of nine dogs, respectively. According to CT, the volume of bone (mean ± SD) through the cage was 79.5% ± 14.3%, including compact bone (53.0% ± 23.4%). Subsidence was seen in one of nine dogs. Implant failure was evident in four dogs, and plates were removed in two dogs. In seven of nine dogs, infraclinical pathology was observed in adjacent segment, associated with implants engaging adjacent intervertebral discs. Radiographic evidence of bony fusion between vertebral bodies was noted in all dogs. Spinal fusion was confirmed by μCT and histopathology in two cervical spine segments that became available at 22 and 40 months postoperatively. Conclusion Instrumented spinal fusion in dogs with disc‐associated CCSM resulted in owner satisfaction and radiographic evidence of interbody spinal fusion in all dogs. Clinical significance The fusion distraction technique reported here can be used to achieve spinal fusion with a good long‐term outcome.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Instrumented cervical fusion in nine dogs with caudal cervical spondylomyelopathy

et al. 2019

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“…However, several postoperative complications are closely associated with the anterior plate, as the plate can lead to the compression or stimulation of vital structures[27]. Zero-P is a stand-alone anchored spacer designed to reduce the profile of the anterior plate in cervical fusion and to simultaneously provide the spine a stable biomechanical environment[12, 13]. Several relevant clinical studies have compared Zero-P and anterior plate techniques following ACDF[16–20, 24–28]; however, the evidence regarding whether Zero-P is superior to anterior plate is insufficient.…”

Section: Discussionmentioning

confidence: 99%

“…The finding that the anterior plate technique produced a greater postoperative cervical Cobb’s angle should be accepted with caution. Both the Zero-P device and the anterior plate can provide a stable biomechanical environment that dramatically promotes vertebral body fusion[12, 13]. This similarity may explain why the fusion rates in two groups were similar.…”

Section: Discussionmentioning

confidence: 99%

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Meta-Analysis Comparing Zero-Profile Spacer and Anterior Plate in Anterior Cervical Fusion

et al. 2015

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BackgroundAnterior plate fusion is an effective procedure for the treatment of cervical spinal diseases but is accompanied by a high incidence of postoperative dysphagia. A zero profile (Zero-P) spacer is increasingly being used to reduce postoperative dysphagia and other potential complications associated with surgical intervention. Studies comparing the Zero-P spacer and anterior plate have reported conflicting results.MethodologyA meta-analysis was conducted to compare the safety, efficacy, radiological outcomes and complications associated with the use of a Zero-P spacer versus an anterior plate in anterior cervical spine fusion for the treatment of cervical spinal disease. We comprehensively searched PubMed, Embase, the Cochrane Library and other databases and performed a meta-analysis of all randomized controlled trials (RCTs) and prospective or retrospective comparative studies assessing the two techniques.ResultsTen studies enrolling 719 cervical spondylosis patients were included. The pooled data showed significant differences in the operation time [SMD = –0.58 (95% CI = −0.77 to 0.40, p < 0.01)] and blood loss [SMD = −0.40, 95% CI (−0.59 to –0.21), p < 0.01] between the two groups. Compared to the anterior plate group, the Zero-P group exhibited a significantly improved JOA score and reduced NDI and VAS. However, anterior plate fusion had greater postoperative segmental and cervical Cobb’s angles than the Zero-P group at the last follow-up. The fusion rate in the two groups was similar. More importantly, the Zero-P group had a lower incidence of earlier and later postoperative dysphagia.ConclusionsCompared to anterior plate fusion, Zero-P is a safer and effective procedure, with a similar fusion rate and lower incidence of earlier and later postoperative dysphagia. However, the results of this meta-analysis should be accepted with caution due to the limitations of the study. Further evaluation and large-sample RCTs are required to confirm and update the results of this study.

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Caudocervical Spondylomyelopathy

Fitzpatrick¹

2018

Locking Plates in Veterinary Orthopedics

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Comparison of the biomechanical properties of a ventral cervical intervertebral anchored fusion device with locking plate fixation applied to cadaveric canine cervical spines

Abstract: An anchored spacer appears to provide similar biomechanical stability to that of locking plate fixation.

Cited by 22 publications

References 29 publications

Instrumented cervical fusion in nine dogs with caudal cervical spondylomyelopathy

Instrumented cervical fusion in nine dogs with caudal cervical spondylomyelopathy

Meta-Analysis Comparing Zero-Profile Spacer and Anterior Plate in Anterior Cervical Fusion

Caudocervical Spondylomyelopathy

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