CT scan based determination of optimal bone corridor for atlantoaxial ventral screw fixation in miniature breed dogs. Issue 7 (3rd September 2013)

• Record Type: Journal Article
• Authors: Revés, Núria Vizcaíno; Stahl, Cristina; Stoffel, Michael; Bali, Monty; Forterre, Franck
• Is Part Of: Veterinary surgery. Volume 42:Issue 7(2013)
• Page Start: 819
• Page End: 824
• Publication Date: 2013-09-03
• Subjects: Veterinary surgery -- Periodicals; Veterinary Medicine -- Periodicals; Surgery -- Periodicals; Societies, Medical -- Periodicals; 636.0897
• DOI: 10.1111/j.1532-950X.2013.12046.x
• Languages: English
• ISSNs: 0161-3499

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="vsu12046-sec-0001" sec-type="section"> <title>Objective</title> <p>To describe the most reliable insertion angle, corridor length and width to place a ventral transarticular atlantoaxial screw in miniature breed dogs.</p> </sec> <sec id="vsu12046-sec-0002" sec-type="section"> <title>Study Design</title> <p>Retrospective CT imaging study.</p> </sec> <sec id="vsu12046-sec-0003" sec-type="section"> <title>Sample Population</title> <p>Cervical CT scans of toy breed dogs (n = 21).</p> </sec> <sec id="vsu12046-sec-0004" sec-type="section"> <title>Methods</title> <p>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.</p> </sec> <sec id="vsu12046-sec-0005" sec-type="section"> <title>Results</title> <p>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.</p> </sec> <sec id="vsu12046-sec-0006" sec-type="section"> <title>Conclusions</title> <p>Optimal placement of a transarticular screw for atlantoaxial joint stabilization is very demanding because the screw path corridor is very narrow.</p> </sec> </abstract>