English

Abstract

Knowing the dimensions of the vertebral elements is very important for the development of instrumentation related to cervical spine. Ethnic variations have been reported in these dimensions. Aim of the present study was to evaluate the metrical details of first and second cervical vertebrae to correct the instability of atlantoaxial joint, and to analyze the morphological features to understand the ergonomics of the craniovertebral joints. This study was conducted in the Department of Anatomy S. M. S. Medical college jaipur. Total 150 (75 atlas and 75 axis) cervical vertebrae were evaluated. All the measurements were taken in bilateral manner using Digital Vernier Calipers with .01 precision. Calculated mean value for width of atlas in our study was 69.03 mm. In present study the observed mean value for anterioposterior diameter of vertebral canal of atlas was 25.52 mm. and transverse diameter was observed as 21.98 mm. Mean value for height of anterior arch of atlas was 7.42 mm and for posterior arch height was calculated 5.3 mm. The mean value of Anterioposterior diameter of Rt. and Lt. Superior articular facet was calculated 17.99 and18.29 mm and transverse diameter was observed as 7.81±1.28 and 8.33±1.54 mm. In our present study anterioposterior diameter of inferior articular facet of atlas was calculated as 13.35±1.50mm and 13.38±1.65 respectively for right and left side and transverse diameter was observed as 6.86±1.32 mm and 6.92±1.44 mm for right and left side. Calculated mean value for width of dens was observed 6.64±0.992mm and mean value of dens length was 12.95 mm. Calculated mean value for A-P diameter of vertebral canal was observed 16.48±1.12 mm and transverse diameter of vertebral canal was calculated as 19.81±1.18 mm. Calculated A-P diameter of Rt. Superior articular facet of axis was 14.65±1.44 mm and for Lt. It was calculated 14.65±1.44 mm and transverse diameter was calculated as 13.38 ±1.65. For inferior articular facet mean value of anterioposterior diameter were observed as 13.35±1.50 and 13.38 ±1.65 mm for right and left side respectively and transverse diameter was evaluated as 6.86 and 6.92 mm for right and left side. Morphometric data's can provide more accurate measurements of anatomical elements of cervical spine that could facilitate diagnosis and preoperative planning and will allow for more accurate modeling of this region.