Measurement of diameter of T4 pedicle-rib compomers / 中国骨伤

<p><b>OBJECTIVE</b>To measure the diameter of T4 pedicle-rib compomers in normal human spines and discuss the importance of related dates.</p><p><b>METHODS</b>T4 computerized tomography (CT) images,including two-dimensional,three-dimensional reconstruction, of 12 random adult patients were harvested. There were 7 males and 5 females with a mean age of 23 years (ranged, 19 to 28 years). The patients were divided into groups by self control,which means the diameter of pedicle compared with that of pedicle-rib unit in the same side of each T4. The facility was GE light speed 16. Measurement of the body specimens from T3 to T5 . The parameter included the width of pedicle-rib unit compared with pedicle,the longitudinal diameter of pedicle-rib unit compared with pedicle, especially for the pedicle-rib overlap.</p><p><b>RESULTS</b>The relationship of T4 pedicle and rib were not on the same level but overlapping. The width of pedicle-rib unit was significantly larger than that of pedicle (P<0.05). The longitudinal diameters of pedicle-rib unit or pedicle were significantly larger than those of pedicle-rib overlap (P<0.05); while there was no significantly difference between the pedicle-rib unit and pedicle (P>0.05).</p><p><b>CONCLUSION</b>The overlapping relationship of T4 pedicle and rib is partly but not whole, which means the longitudinal diameter of T4 pedicle-rib overlap should not be considered as the same of unit or pedicle.</p>

The anatomic and radiographic morphometry of thoracic pedicle rib unit / 中华外科杂志

<p><b>OBJECTIVES</b>To investigate the spatial structure of pedicle rib units in normal thoracic human spines and to compare the dimensions of the pedicle rib unit with corresponding dimensions.</p><p><b>METHODS</b>Thoracic spine specimens in four fresh adult cadaveric were used. Computerized tomographic (CT) images (including two-dimensional, three-dimensional reconstruction) of the thoracic spines were obtained. Measurement parameters include:the width, the height, the chord length and the sagittal angles of the pedicle rib unit compared with pedicle, especially for the pedicle-rib overlapping height.</p><p><b>RESULTS</b>The pedicle rib unit was not a simple two-dimensional structure but a three-dimensional structure. The shortest height of pedicle rib unit was (12.6 ± 0.8) mm (T(1)), while the longest was (16.9 ± 1.1) mm (T(11)). The shortest height of pedicle-rib overlap was (7.2 ± 0.3) mm (T(1)), while the longest was (11.8 ± 1.0) mm (T(10)). The height of pedicle rib unit and the height of pedicle were significantly larger than that of the pedicle-rib overlap (P < 0.05), while there was no significantly difference between the height of pedicle rib unit and the height of pedicle (P > 0.05).</p><p><b>CONCLUSIONS</b>The pedicle rib unit is a complicated spatial structure, and the longitudinal height of pedicle-rib overlap should be taken as the real height of the unit.</p>

Immigration and proliferation of Schwann cells in chemical acellular xenogeneousnerve grafts in rats / 中华显微外科杂志

Objective To observed the immigration and proliferation of Schwann cells in acellular xe- no-nerve graft in rats.Methods The sciatic nerves on the right side of the rats were exposc.d and 0.8cm long segments of the nerves were removed from the mid-thigh level and replaced by 1.0cm long rabbit nerves made acellular through chemical extraction.After 4 months,the immigration and proliferation of Schwann cells in the graft were revealed by HE staining,S-100 immunohistochemieal staining and transmission electromicro- scope.Results In the rats repaired by acellular nerves,regenerated axons upgrow into the graft,and a- round regenerated axons there were abundant cells aligned,the cytoplasm of which were S-100 immunoreac- tive.Electromicroscope observing showed that regenerated axons were surrounded by myelin formed by the mi- grated cells reoccupied the acellular segments.Conclusion The host Schwann cells can immigrate into rab- bit nerve grafts made acellular through chemical extraction and form myelin enwrapping regenerated axons in rats.