CT scan based determination of optimal bone corridor for atlantoaxial ventral screw fixation in miniature breed dogs

Revés, Núria Vizcaíno; Stahl, Christina; Stoffel, Michael; Bali, M; Forterre, Franck

doi:10.1111/j.1532-950x.2013.12046.x

Cited by 15 publications

(11 citation statements)

References 19 publications

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“…The online search of the literature identified 32 pertinent references [4–7, 9, 10, 22, 25–49]. Upon review of these references, 9 safe bone corridors were defined corresponding to anatomical parts of the AA vertebrae.…”

Section: Resultsmentioning

confidence: 99%

“…An anatomical axis is then needed within that plane to define a proper coordinate system. In a previous report, the craniocaudal axis for C2 was defined as the ventral border of the vertebral foramen, which is what was also used in our study [9]. To our knowledge, a similar axis had not yet been described for C1.…”

Section: Discussionmentioning

confidence: 97%

“…The small size of affected dogs and extremely narrow bone corridors used to position stabilizing implants are often considered major technical limitations of these procedures [9, 10]. These technical difficulties have led neurosurgeons to develop novel techniques to either improve accuracy of implant placement or to multiply the number of implants to better distribute the load applied on the stabilizing construct [2–6, 9, 10].…”

Section: Introductionmentioning

confidence: 99%

“…These technical difficulties have led neurosurgeons to develop novel techniques to either improve accuracy of implant placement or to multiply the number of implants to better distribute the load applied on the stabilizing construct [2–6, 9, 10]. Complications directly resulting from such narrow bone corridors include iatrogenic bone fracture and violation of the vertebral canal by the stabilizing implants.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, AA implant sites have been subjectively defined without detailed anatomical description. The only OSIC that has been more precisely studied in dogs is the corridor used for TSF fixation [5, 9]. However, available studies have used different subjective definitions of the optimal implant position and therefore obtained slightly different results.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Atlantoaxial Instability

Slanina

2016

Veterinary Clinics of North America: Small Animal Practice

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Atlantoaxial instability is a congenital neurologic condition predominantly affecting toy breed dogs. Neurologic signs of a cranial cervical myelopathy typically present at a young age and can range from cervical pain (hyperesthesia) to paralysis. Diagnosis is often based on survey radiographs, although advanced diagnostic imaging can facilitate surgical planning, allow evaluation of spinal cord parenchyma, and rule out concurrent neurologic conditions. Treatment options consist of medical or surgical management, with surgical management being preferable in patients with neurologic deficits or those with unresolved cervical pain despite medical management. The prognosis for surgery is generally favorable.

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Morphometric and functional study of the canine atlantoaxial joint

Planchamp

Bluteau

Stoffel

et al. 2020

Research in Veterinary Science

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CT scan based determination of optimal bone corridor for atlantoaxial ventral screw fixation in miniature breed dogs

Abstract: Optimal placement of a transarticular screw for atlantoaxial joint stabilization is very demanding because the screw path corridor is very narrow.

Cited by 15 publications

References 19 publications

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

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

Atlantoaxial Instability

Morphometric and functional study of the canine atlantoaxial joint

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