Bicortical Implant Insertion in Caudal Cervical Spondylomyelopathy: A Computed Tomography Simulation in Affected Doberman Pinschers

Corlazzoli, Daniele

doi:10.1111/j.1532-950x.2007.00356.x

Cited by 24 publications

(28 citation statements)

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“…32 The angles for ideal screw insertion are of limited use in dogs, because of conflicting reports, inter-and intra-breed anatomical variations, and rotational effects of both surgical positioning and intraoperative probing or screwing on vertebral alignment. 14,33,34 Consequently, free-hand CPS placement in dogs is not recommended. 14,33 The authors recently developed a 3D PDG, which permitted rapid, safe, and accurate placement of bicortical pedicle screws to stabilize a fracture of C2 in a 25 kg Pointer.…”

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confidence: 99%

“…14,33,34 Consequently, free-hand CPS placement in dogs is not recommended. 14,33 The authors recently developed a 3D PDG, which permitted rapid, safe, and accurate placement of bicortical pedicle screws to stabilize a fracture of C2 in a 25 kg Pointer. 35 In light of this success and the high degree of accuracy achieved in human patients, we hypothesized that a 3D PDG in veterinary patients would allow accurate placement of CPS.…”

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Accuracy of a patient‐specific 3D printed drill guide for placement of cervical transpedicular screws

2017

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Accuracy of a patient‐specific 3D printed drill guide for placement of cervical transpedicular screws

2017

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“…A major complication of using pins or screws is the inadvertent invasion to the spinal cord or the laceration of vertebral artery at the transverse foramina. Angle of insertion of the implants ranges from 30 to 35 o ; however, that angle is influenced by the torsion of the animal and may carry a high risk for vertebral canal and intervertebral foramen violation, especially in the caudal cervical area (Corlazzoni, 2008). In the majority of examined vertebral bodies from C2 to C6, the width of the corridor preserving the transverse foramina was estimated to be smaller than 2.5 mm (Watine et al, 2006).…”

Section: Conservative (Non-surgical) Treatmentmentioning

confidence: 99%

“…Generally, most of the techniques have a success rate of approximately 70% to 80% (Jeffery and McKee, 2001). Accurate symmetrical positioning of the animal in dorsal recumbency is critical to avoid rotation of the spine along the longitudinal axis during the procedure, especially when bicortical implants are to be used (Corlazzoni, 2008).…”

Section: Conservative (Non-surgical) Treatmentmentioning

confidence: 99%

Cervical spondylomyelopathy in dogs

Μουζακιτησ)

Kazakos

Patsikas

et al. 2017

J Hellenic Vet Med Soc

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ABSTRACT. Cervical spondylomyelopathy (CSM) is the most common disease of the cervical spine in large and giant breed dogs. Its exact aetiology is not known and the relevant pathophysiology is not clear; two clinical entities are currently recognised: disc-associated and osseous-associated spinal cord compression. History and clinical signs are indicative of cervical spondylomyelopathy, although its neurologic manifestation can vary from cervical pain only to tetraparesis and respiratory compromise. Imaging of the spine is fundamental for definitive diagnosis and includes radiography, myelography, computed tomography and magnetic resonance imaging. It is also the cornerstone of surgical planning. This is usually based on the subjective concept of dynamic or static compressive lesions. Among the advanced imaging techniques, magnetic resonance imaging is superior to myelography for diagnosis of cervical spondylomyelopathy, although, at present, these techniques can be considered complementary. Furthermore, attention is drawn to the false positive interpretations of magnetic resonance findings, which are related to clinically irrelevant spinal cord compression. Hence, the degree of agreement between neuroanatomic localization and neuroimaging is of the outmost importance. Conservative treatment consists of strict restriction of the animal and the use of steroid or non-steroid anti-inflammatory drugs. Objective of surgical treatment is to decompress the spinal cord. However, the decision-making process of surgical treatment is more complicated, because a large number of different surgical techniques have been proposed. Adjacent segment disease is a controversial complication of the surgical treatment of disk-associated cervical spondylomyelopathy and recently introduced motion-preserving techniques are targeted on reducing its occurrence. Significant prognostic information for focal parenchymal damage may derive from magnetic resonance imaging studies, but this remains to be further clarified.

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“…Using such a predefined plane allows simplification of a complex 3D problem into a bidimensional description. This method has been applied successfully along most of the vertebral column because stabilizing implants are typically positioned within the transverse plane of each vertebra [20–23]. However, most of the reported atlas (C1) and axis (C2) implantation sites have an oblique direction precluding the use of these traditional methods.…”

Section: Introductionmentioning

confidence: 99%

Canine atlantoaxial optimal safe implantation corridors – description and validation of a novel 3D presurgical planning method using OsiriX™

et al. 2016

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BackgroundCanine ventral atlantoaxial (AA) stabilization is most commonly performed in very small dogs and is technically challenging due to extremely narrow bone corridors. Multiple implantation sites have been suggested but detailed anatomical studies investigating these sites are lacking and therefore current surgical guidelines are based upon approximate anatomical landmarks. In order to study AA optimal safe implantation corridors (OSICs), we developed a method based on computed tomography (CT) and semi-automated three-dimensional (3D) mathematical modelling using OsiriX™ and Microsoft®Excel software. The objectives of this study were 1- to provide a detailed description of the bone corridor analysis method and 2- to assess the reproducibility of the method. CT images of the craniocervical junction were prospectively obtained in 27 dogs and our method of OSIC analysis was applied in all dogs. For each dog, 13 optimal implant sites were simulated via geometrical simplification of the bone corridors. Each implant 3D position was then defined with respect to anatomical axes using 2 projected angles (ProjA). The safety margins around each implant were also estimated with angles (SafA) measured in 4 orthogonal directions. A sample of 12 simulated implants was randomly selected and each mathematically calculated angle was compared to direct measurements obtained within OsiriX™ from 2 observers repeated twice. The landmarks simulating anatomical axes were also positioned 4 times to determine their effect on ProjA reproducibility.ResultsOsiriX could be used successfully to simulate optimal implant positions in all cases. There was excellent agreement between the calculated and measured values for both ProjA (ρc = 0.9986) and SafA (ρc = 0.9996). Absolute differences between calculated and measured values were respectively [ProjA = 0.44 ± 0.53°; SafA = 0.27 ± 0.25°] and [ProjA = 0.26 ± 0.21°; SafA = 0.18 ± 0.18°] for each observer. The 95 % tolerance interval comparing ProjA obtained with 4 different sets of anatomical axis landmarks was [−1.62°, 1.61°] which was considered appropriate for clinical use.ConclusionsA new method for determination of optimal implant placement is provided. Semi-automated calculation of optimal implant 3D positions could be further developed to facilitate preoperative planning and to generate large descriptive anatomical datasets.Electronic supplementary materialThe online version of this article (doi:10.1186/s12917-016-0824-3) contains supplementary material, which is available to authorized users.

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Bicortical Implant Insertion in Caudal Cervical Spondylomyelopathy: A Computed Tomography Simulation in Affected Doberman Pinschers

Cited by 24 publications

References 11 publications

Accuracy of a patient‐specific 3D printed drill guide for placement of cervical transpedicular screws

Accuracy of a patient‐specific 3D printed drill guide for placement of cervical transpedicular screws

Cervical spondylomyelopathy in dogs

Canine atlantoaxial optimal safe implantation corridors – description and validation of a novel 3D presurgical planning method using OsiriX™

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