Radiology of postnatal skeletal development
Tóm tắt
Composites of C1 and C2 were analyzed in various roentgenographic projections to elucidate osseous interrelationships and the effect of overlap of different portions of these two vertebrae in standard radiographic projections during differing stages of postnatal chondro-osseous transformation. In anteroposterior projections the dentocentral synchrondrosis of C2 normally was located below the inferior rim of the C1 anterior ossification center. The upper extent of the dens ossification center was behind this anterior C1 center. The overlap made visualization of the ossiculum terminale difficult. The spinous process of C1 could be confused with the ossiculum. In tranverse projections, the normal laxity characteristic of young children allowed considerable variation in rotational interrelationships. Various degrees of such instability are illustrated. In lateral views variation of the anterior contour of the dens was significant. Such variation must be considered developmental due to the location and direction of growth of the chondrum terminale and interactive modeling between C1 and C2 to allow extension at this particular joint.
Tài liệu tham khảo
Bohrer SP, Klein A, Martin W (1985) V-shaped predens space. Skeletal Radiol 14:111
Fielding JW (1971) Disappearance of the central portion of the odontoid process. J Bone Joint Surg [Am] 41:345
Freiberger RH, Wilson PH, Nicholas JA (1965) Acquired absence of the odontoid process. J Bone Joint Surg [Am] 47:1231
Gillman JL (1962) Congenital absence of the odontoid process of the axis. J Bone Joint Surg [Am] 41:345
Gwinn JL (1962) Acquired and congenital absence of the odontoid process. AJR 88:424
Hanson TA, Draft JP, Adcock DW (1973) Subluxation of the cervical vertebra due to pharyngitis. South Med J 66:427
Martell W, Upham R, Stimson CW (1969) Subluxation of the atlas causing spinal cord compression in a case of Down's syndrome with a manifestation of an occipital vertebra. Radiology 93:389
Murphy MJ, Ogden JA, Bucholz RW (1981) Cervical spine injury in the child. Contemp Orthop 3:615
Ogden JA (1982) Skeletal injury in the child. Lea and Febiger, Philadelphia
Ogden JA (1984) Radiology of postnatal skeletal development. XI. The first cervical vertebra. Skeletal Radiol 12:12
Ogden JA (1984) Radiology of postnatal skeletal development. XII. The second cervical vertebra. Skeletal Radiol 12:169
Stillwell WT, Fielding JW (1978) Acquired os odontoideum. Clin Orthop 135:71
Sullivan AW (1949) Subluxation of the atlanto-axial joint: sequel to inflammatory processes of the neck. J Pediatr 35:415
Swischuk LE, Hayden CK Jr, Sarwar M (1979) The posteriorly tilted dens. A normal variation mimicking a fractured dens. Pediatr Radiol 8:27