Abstract:

Objective　Based on the MRI measure values of cervical vertebral interspace of healthy Chinese people, we aim to design the cervical allograft bone spacer in anterior cervical fusion to match the anatomical characteristics of Chinese people.　Methods　One hundred young normal Chinese people (50 males, aged 20~55 years，with an average of 38.7 years；50 females, aged 20~55 years，with an average 36.1 years) were scanned by MRI according to gender．Measurements of the transverse diameter and sagittal diameter，as well as the anterior edge height, midpoint height and posterior edge height，were surveyed with C2,3~C6,7 vertebral interspaces． According to the data, we designed the allograft bone cervical fusion spacer. Results　Located in the midline sagittal, the posterior edge height of cervical intervertebral space at the same segment was shorter than the leading edge height, which was further shorter than midpoint height (P<0.05). The transverse diameter of cervical intervertebral space was greater than the sagittal diameter (P<0.05). The male's measure values of the same segment was greater than the female's (P<0.05). The cervical allograft bone spacer was designed wedge-shaped and had 6,7,8,9 mm four models according to its anterior edge height. There had inverted tooth structure on the surface. The demineralized bone matrix (DBM) placed hole, which was filled with the power of DBM, was located in the center of spacer.　Conclusion　The cervical allograft bone spacer which was designed with the MRI measure values of cervical vertebral interspace was compliant with the anatomy data of Chinese people.

Key words: Cervical vertebral interspace, Anatomy, Allograft bone, Spacer, Demineralized bone matrix (DBM)