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- Title
Boomerang deformity of cervical spinal cord migrating between split laminae after laminoplasty.
- Authors
Kimura, Shinji; Gomibuchi, Fumio; Shimoda, Haruka; Ikezawa, Yoshiyasu; Segawa, Hiroyuki; Kaneko, Fujio; Uchiyama, Seiji; Homma, Takao; Kimura, S; Gomibuchi, F; Shimoda, H; Ikezawa, Y; Segawa, H; Kaneko, F; Uchiyama, S; Homma, T
- Abstract
Patients with cervical compression myelopathy were studied to elucidate the mechanism underlying boomerang deformity, which results from the migration of the cervical spinal cord between split laminae after laminoplasty with median splitting of the spinous processes (boomerang sign). Thirty-nine cases, comprising 25 patients with cervical spondylotic myelopathy, 8 patients with ossification of the posterior longitudinal ligament, and 6 patients with cervical disc herniation with developmental canal stenosis, were examined. The clinical and radiological findings were retrospectively compared between patients with (B group, 8 cases) and without (C group, 31 cases) boomerang sign. Moderate increase of the grade of this deformity resulted in no clinical recovery, although there was no difference in clinical recovery between the two groups. Most boomerang signs developed at the C4/5 and/or C5/6 level, where maximal posterior movement of the spinal cord was achieved. Widths between lateral hinges and between split laminae in the B group were smaller than in the C group. Flatness of the spinal cord in the B group was more severe than in the C group. In conclusion, the boomerang sign was caused by posterior movement of the spinal cord, narrower enlargement of the spinal canal and flatness of the spinal cord.
- Subjects
CERVICAL spondylotic myelopathy; SPINAL cord; CENTRAL nervous system; SPINE; SPINAL osteophytosis complications; SPINAL cord diseases
- Publication
European Spine Journal, 2000, Vol 9, Issue 2, p144
- ISSN
0940-6719
- Publication type
journal article
- DOI
10.1007/s005860050225