The three-dimensional finite investigation of cervical flexion motion

objevtive To measure variations on stress magnitude in cervical vertebrae exerted by cervical flexion motion.Methods The cervical vertebrae model was produced using super-SAP soft ware in computer.The force of muscle and ligament was added to the model by anatomy.The data was calculated by computer.Results In cervical flexion the maximum stress lie the rear edges of C 5-6 vertebrae bodies and in the C 5 7 Luschka joints and in the C 5 7 zygapophysial joints;the maximum ST acted in C 4 5 intervertebral disc.Conclusion The stress focused on the lower-mid cervical spine when in cervical flexion.It indicated the mechanism of cervical spondylosis.