Normal global motion of the cervical spine: an electrogoniometric study

Objective: Establishment of a normal database and clinical reference of act ive global cervical spine motion ranges and patterns using a commercial ele ctrogoniometer. Design. Three-dimensional cervical motion ranges and patterns were analyzed in 250 asymptomatic volunteers. Background: In vivo out-of-plane motion patterns of the cervical spine have not yet been reported in large populations, but could be of clinical inter est. Methods. In 250 subjects (aged 14-70 yr), motion range and patterns between the first thoracic vertebra and the head were analyzed for flexion-extensi on, lateral bending, rotation in neutral sagittal plane position and in ful l flexion using the CA 6000 Spine Motion Analyzer. Results and Conclusions: Average motion range in the sagittal plane was 122 degrees (SD: 18 degrees). Flexion was slightly more important than extensi on. Out-of-plane components were negligible. Global bending range averaged 88 degrees (SD: 16 degrees), left and right bending being comparable. Homol ateral rotation was associated to lateral bending. Its extent was approxima tely 40% of the bending range. Global rotation range in neutral sagittal pl ane position was 144 degrees (SD: 20 degrees), without significant differen ce between right and left rotations. Associated motion components were smal l. During rotation in flexed head position, global range (134 degrees, SD: 24 degrees) was comparable to the one in neutral flexion. But heterolateral bending, averaging 60% of the primary motion, was associated to flexed rot ation. Significant reduction of all primary (but not conjunct) motions with age were obtained. Sex had no influence on cervical motion range.