RESUMEN
Objective To explore the risk factors of surgical treatment for children’ s tethered cord syndrome. Methods Retrospective-ly analyzed the clinical data of 43 tethered cord syndrome children who had undergone surgical treatment from January 2007 to December 2009,and to evaluate the efficacy of the surgical treatment. Meanwhile,The Cox proportional hazards regression model was adopted to evaluate the surgical efficacy. Results 28 children received effctive curative effect after the surgical treatment in 43children with tethered cord syn-drome,the total effective rate was 65. 12%. Cox medol showed that tight filum terminale(P<0. 05), operation methods (P<0. 05)and the duration of the disease(P<0. 05)were independent risk factors of surgical treatment for children’s tethered cord syndrome. Conclusion The operativeefficacy of children’ s tethered cord syndrome were influence by the tight filum terminale,operation methods and the duration of the disease.
RESUMEN
The normal human fibroblast cell line (NHF8) derivd from normal adult foreskin was passaged successfully in cell culture for more than 400 days.The cells were fibro-blast-like and were grown in the cell culture media NO.I with 15% newborn calf serum and were subcultured by trypsinization at a 1 : 2 split ratio. The cell line had a log phase doubling time of 26 h and its growth curve appeared in "s" shape. The mode of the chromosomes of the cell line was 46 and its frequency of sister-chroma -tid exchange (SCE), induced by UV irradiation or [not, was 0.143/per chromosome and 0.144/per chromosome respectively. The level of UV-induced unscheduled DNA synthesis (UDS) was also normal. The results demonstrate that the cell line is normal human diploid fibroblast cell line with normal function of excision repair of DNA damage and can be used as control cells in many studies.