objective to observe the projection of pedicle of lumbar vertebral arch on the vertebral body and research the regular pattern of its central point.
目的观测腰椎椎弓根在椎体上的投影,探寻其中心位位置的规律。
objective: to analyze the correlation of the incidence rate of spondylolysis of lumbar vertebral arch with training and the original lesions at waist in recruits.