Takuya Numasawa

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STUDY DESIGN A prospective study in 19 patients after cervical laminoplasty, using magnetic resonance imaging. OBJECTIVE To evaluate the value of spinal cord shift at 24 hours after cervical laminoplasty. SUMMARY OF BACKGROUND DATA Postoperative C5 palsy is a noticeable complication within 1 week after cervical laminoplasty. The root tethering due to(More)
Ossification of the posterior longitudinal ligament of the spine (OPLL) is recognized as a common disorder among Japanese and throughout Asia. Estimates of its prevalence are in the range of 1. 9%-4.3%. Although its etiology is thought to involve a multiplicity of factors, epidemiological and family studies strongly implicate genetic susceptibility in the(More)
STUDY DESIGN Results of C4-C7 laminoplasty with C3 laminectomy and C3-C7 laminoplasty were compared. OBJECTIVES To clarify prospectively whether the modified laminoplasty preserving the semispinalis cervicis inserted into C2 could reduce the axial symptoms compared with conventional laminoplasty reattaching the muscle to C2. SUMMARY OF BACKGROUND DATA(More)
Ossification of the posterior longitudinal ligament of the spine (OPLL) is characterized by ectopic bone formation in the ligament. OPLL is a very common disorder, in fact it constitutes the leading cause of myelopathy among Japanese. In the previous report, we provided the genetic linkage evidence that the genetic susceptibility of OPLL mapped to HLA(More)
AbstractAmong Japanese, ossification of the posterior longitudinal ligament of the spine (OPLL) is a leading cause of myelopathy, showing ectopic bone formation in the paravertebral ligament. We have provided genetic evidence that the collagen α2 (XI) (COL11A2) locus of chromosome 6 constitutes susceptibility for OPLL. Five distinct single nucleotide(More)
STUDY DESIGN A clinical and cohort study. OBJECTIVE The first purpose of this study was to investigate the standard value of a simple foot tapping test (FTT) in a large healthy population. The second purpose was to elucidate the validity of FTT as a quantitative assessment of lower extremity motor function for cervical compressive myelopathy. SUMMARY OF(More)
OBJECT Previous reports of redundant nerve roots (RNRs) of the cauda equina have been limited to evaluations based on myelography. Neither the imaging nor the clinical features of RNRs in relation to magnetic resonance (MR) imaging have been elaborated. The MR imaging characteristics of RNRs were evaluated using the Japanese Orthopaedic Association score(More)
Ossification of the posterior longitudinal ligament of the spine (OPLL) is a common musculoskeletal disease among people after middle age. The OPLL presents with serious neurological abnormalities due to compression of the spinal cord and nerve roots. The OPLL is caused by genetic and environment factors; however, its etiology and pathogenesis still remain(More)
The purpose of this study was to assess the ability of short inversion time inversion-recovery (STIR) in magnetic resonance imaging for predicting the prognosis of osteoporotic vertebral fractures. We analyzed 63 vertebrae of 56 patients who had osteoporotic vertebral fracture (Th10–L2) prospectively. Image finding of a homogeneous high signal change on a(More)
OBJECT The clinical characteristics of pediatric scoliosis associated with syringomyelia have been reported in previous studies, but scoliosis associated with syringomyelia in adults is rarely treated, and there is a paucity of detailed studies. In the present study of adult syringomyelia associated with Chiari malformation Type I, the authors investigated(More)