Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Spine
Abstract number: 23963
MORPHOLOGICAL ANALYSIS OF THE CERVICAL PEDICLES, LATERAL
MASSES AND LAMINAE IN DEVELOPMENTAL CANAL STENOSIS
Masashi MIYAZAKI, Chikahiro TAKITA, Toyomi YOSHIIWA, Hiroshi TSUMURA
Department of Orthopaedic Surgery, Faculty of Medicine, Oita University, Oita
(JAPAN)
This study aimed to elucidate the relationship among developmental spinal canal
stenosis (DCS) and morphologic features in cervical spine comparing with nondevelopmental
spinal canal stenosis (NDCS), especially the posterior structures, by
using CT myelography. 52 consecutive patients underwent cervical spine CT
myelography. Axial images were selected from each C-3 to C-7 vertebrae and the
total 260 images were analyzed. The following parameters were measured, SCLD
(spinal canal longitudinal diameter), SCTD (spinal canal transverse diameter), OSCA
(osseous spinal canal area), DSA (dural sac area), SCA(spinal cord area), POW
(pedicle outer width), PAL (pedicle axis length), PTA (pedicle transvers angulation,),
LMLD (lateral mass longitudinal diameter), LMTD (lateral mass transverse diameter),
LOW (lamina outer width), LAL (lamina axis length) . The participants were classified
into 2 groups - DCS group (the SCLD was less than 12mm at any level) or NDCS
group (the SCLD was more than 12mm at all level). The mean OSCA and DSA from
C3-5 in DCS group were less than those in NDCS group. There were no significant
differences in the mean SCA from C3-7 among the groups .The mean POW at C6
and C7 in DCS group were less than those in NDCS group. The mean LMTD at C5
and the mean LMLD at C3, C5 and C6 in DCS group were less than those in NDCS
group. It is expected that patients with DSC progress the myelopathy and need the
cervical operation. However, the posterior screw insertion should be considered
carefully because of its morphologic features.
401