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CT scan based determination of optimal bone corridor for atlantoaxial ventral screw fixation in miniature breed dogs
Author(s) -
Revés Núria Vizcaíno,
Stahl Cristina,
Stoffel Michael,
Bali Monty,
Forterre Franck
Publication year - 2013
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2013.12046.x
Subject(s) - atlantoaxial instability , medicine , dorsum , breed , anatomy , fixation (population genetics) , cervical vertebrae , cage , nuclear medicine , orthodontics , cervical spine , surgery , biology , zoology , mathematics , population , environmental health , combinatorics
Objective To describe the most reliable insertion angle, corridor length and width to place a ventral transarticular atlantoaxial screw in miniature breed dogs. Study Design Retrospective CT imaging study. Sample Population Cervical CT scans of toy breed dogs (n = 21). Methods Dogs were divided into 2 groups—group 1: no atlantoaxial abnormalities; group 2: atlantoaxial instability. Insertion angle in medial to lateral and ventral to dorsal direction was measured in group 1. Corridor length and width were measured in groups 1 and 2. Corridor width was measured at 3 points of the corridor. Each variable was measured 3 times and the mean used for statistical analysis. Results Mean ± SD optimal transarticular atlantoaxial insertion angle was determined to be 40 ± 1° in medial to lateral direction from the midline and 20 ± 1° in ventral to dorsal direction from the floor of the neural canal of C2. Mean corridor length was 7 mm (range, 4.5–8.0 mm). Significant correlation was found between corridor length, body weight, and age. Mean bone corridor width ranged from 3 to 5 mm. Statistically significant differences were found between individuals, gender and measured side. Conclusions Optimal placement of a transarticular screw for atlantoaxial joint stabilization is very demanding because the screw path corridor is very narrow.