3Mahlfeld K, Kayser R, Grahoff, H. Permanent Thoracic Myelopathy Resulting from Herniation of a Calcified Intervertebral Disc in a Child. J Pediatr Orthop, B 2002, 11 : 6.
4Dai LY, Ye H, Qian QR. The natural history of cervical disc cal -cification in children. J Bone Joint Surg Am, 2004,86 -A(7) :1 467 -1 472.
5Gedach R, ZimmermannM, Kellermann S, et al. Cervical inter - vertebral disc calcification in children: a case report and review of theliterature. Acta Neurochir ( Wien), 2001, 143 (1) : 89-93.
6Giordias JB, Azouz EM, Marton D. Intervertebral disc space calciferation: a report of 51 children with review of the literature. Pediatr Radiol ,1991,21:541-6.
7Mahlfeld K, Kayser R, Grahoff H. Permanent thoracic myelopathy resulting from herniation of a calcified intervertebral disc in a child [J]. J Pediatr Orthop B, 2002, 1( 1 ): 6-9.
