Objective To measure size of cervical intervertebral foramen, explore the effect of high-G load experienced by fighter pilots on their cervical spine.

If this is not the case, the bearing must be subjected to an additional radial load, e. G. by increasing belt tension or idling torque, or by other means.

Many methods, e. g. static force method, moment method, sub-region method and least square method, have been used tog et the critical load.