The thoracic spine morphology under magnetic resonance imaging in adolescent idiopathic scoliosis and its clinical significance / 中华外科杂志

<p><b>OBJECTIVES</b>To evaluate and compare thoracic vertebrae morphology between patients with idiopathic and normal adolescents through MRI.</p><p><b>METHODS</b>Two-dimensional sagittal MRI of the spine was performed in 10 normal adolescent, 10 patients with mild idiopathic thoracic scoliosis (Cobb angle 15 degrees - 39 degrees ) and 10 patients with moderate thoracic scoliosis (Cobb angle 40 degrees - 75 degrees ), all of them were female and between 13 - 14 years old. Sagittal imaging was reconstructed on image working station (Easy Vision, Philips Medical Systems, Best, Netherlands). Anterior height, posterior height and width of vertebral body as well as length between spinous process were measured on each thoracic spine.</p><p><b>RESULTS</b>Anterior height, posterior height and width of vertebral body increased from T(1) to T(12) with the values from scoliotic groups larger than normal group. The anterior height/width ratio and anterior/posterior column ratio were also larger in scoliotic group especially at apical area.</p><p><b>CONCLUSION</b>The thoracic vertebrae are higher and slimmer in scoliotic patient than in normal age-matched girls which implied that there is abnormal endochondral ossification on spine during adolescent growth spurt.</p>

Effect of genetic polymorphism of MTNR1A gene on adolescent idiopathic scoliosis / 中华外科杂志

<p><b>OBJECTIVE</b>To investigate whether the MTNR1A gene promotor polymorphism (rs2119882) are associated with the occurrence or curve severity of adolescent idiopathic scoliosis (AIS).</p><p><b>METHODS</b>226 AIS patients and 277 normal controls were recruited. The maximum Cobb angles were recorded in AIS patients. PCR-RFLP was used for the genotyping.</p><p><b>RESULTS</b>The genotype and allele frequency distribution were comparable between AIS and normal control, the mean maximum Cobb angle of different genotypes of rs2119882 were similar with each other among AIS patients.</p><p><b>CONCLUSION</b>The MTNR1A gene promoter polymorphism was neither associated with the occurrence nor the curve severity of AIS.</p>

Trabecular bone micro-architecture in adolescent idiopathic scoliosis compared between concave and convex site of the facet joints / 中华外科杂志

<p><b>OBJECTIVE</b>To evaluate the trabecular bone micro-structure from different sites of spine in adolescent idiopathic scoliosis patients. The target site consisted of the bilateral facet joints from apical vertebrae and from end vertebrae.</p><p><b>METHODS</b>Nine AIS patients with mean age 14.9 years (range 12-17 years) and mean Cobb angle 56 degrees (ranged 48 degrees-84 degrees) were recruited into this study. Corrective surgery was indicated to these patients, and facet joint biopsies were collected during decortications for spinal fusion. Biopsy consents were obtained from patients. Bone specimens were fixed with routine histology procedures and scanned by micro computer tomography (muCT40, Scanco Medical, Switzerland). Ten pairs of facet joint were harvested from apical vertebrae and 12 pairs from end vertebrae. Three-dimensional reconstructed images with the resolution of 20 microm were achieved for histomorphometric analysis.</p><p><b>RESULTS</b>The values of BV/TV (0.268 vs. 0.354, P < 0.05), TbTh (0.20 vs. 0.24, P < 0.05), TbSP (0.66 vs. 0.56, P < 0.05) and BS/BV (12.7 vs. 10.4, P < 0.05) between convex and concave side at the apex area were significantly different. No difference was found in any structural parameters between left and right side at end area, and upper thoracic (T5, 6) and thoracolumbar (T12, L1).</p><p><b>CONCLUSION</b>Due to asymmetric compression and tension shared between convex and concave side, more bone and thicker and more profound trabecular bones are observed in the concave side than in the convex side, which seems to resist the progression of spinal curvature. This finding suggests that the provocative factors which cause the progression of the curve in certain patients may not lie in the bone component of spine.</p>