Objectives To evaluate the characteristics of biomechanics of intra-segmental trans-pedicle screws and rod to spondylolysis, and the clinical application of that operation.

• 目的评价单椎节经椎弓根钉棒固定治疗腰椎弓峡部裂的生物力学特点,临床应用并随访观察手术疗效。