Silt deposition occurs in the downstream approach channel of the tidal lock as in a closed channel or excavated dock basin. It is often difficult to calculate or predict siltation because of complex flow and sediment ...Silt deposition occurs in the downstream approach channel of the tidal lock as in a closed channel or excavated dock basin. It is often difficult to calculate or predict siltation because of complex flow and sediment conditions and many other affecting factors. In this paper, the characteristics of flow movement in the approach channel (including its mouth) of the tidal lock are analyzed, the basic laws of sediment movement and siltation mechanism are investigated, the conditions for three types of siltation (circumfluence siltation, density flow siltation and slow flow siltation) are discussed, and corresponding calculating formulas are proposed. A practical example shows that the difference between measured and calculated results is small, indicating that the present calculating methods could be used in design and management of practical engineering projects.展开更多
目的探讨经内侧入路单切口治疗胫骨平台后内侧骨折的手术疗效。方法选取我院2006年10月至2010年6月间经内侧入路治疗的胫骨平台后内侧骨折21例。取膝关节内侧切口显露胫骨平台内侧髁骨折块,撑开骨折间隙,C臂机监视下经此间隙撬拨,植骨...目的探讨经内侧入路单切口治疗胫骨平台后内侧骨折的手术疗效。方法选取我院2006年10月至2010年6月间经内侧入路治疗的胫骨平台后内侧骨折21例。取膝关节内侧切口显露胫骨平台内侧髁骨折块,撑开骨折间隙,C臂机监视下经此间隙撬拨,植骨填充复位外侧平台满意后以克氏针固定;直视下复位胫骨平台后内侧骨折,以4.5mm空心螺钉和支持钢板内固定。术后进行临床和影像学随访,随访终末行美国特种外科医院(the Hospital for Special Surgery,HSS)膝关节评分和骨关节炎Kellgren-Lawrence评分。结果 15例患者随访10～13个月,平均11.5个月。6例患者失访,剔除出组。术后即刻和随访终末的胫骨平台内翻角和胫骨内侧平台后倾角的差异无统计学意义(P>0.05)。随访终末时,屈膝100°～135°,平均122.3°;伸膝0°～7°,平均2.9°。膝关节HSS评分78～94分,平均86.8分;13.33%(2/15)患者为轻度骨关节炎;无感染、皮肤坏死、内固定松动或断裂等并发症发生。结论经内侧手术入路能够同时修复胫骨平台内侧髁骨折和后外侧平台塌陷骨折,坚强内固定可以充分防止力线改变和骨折再移位,治疗胫骨平台后内侧骨折疗效满意。展开更多
文摘Silt deposition occurs in the downstream approach channel of the tidal lock as in a closed channel or excavated dock basin. It is often difficult to calculate or predict siltation because of complex flow and sediment conditions and many other affecting factors. In this paper, the characteristics of flow movement in the approach channel (including its mouth) of the tidal lock are analyzed, the basic laws of sediment movement and siltation mechanism are investigated, the conditions for three types of siltation (circumfluence siltation, density flow siltation and slow flow siltation) are discussed, and corresponding calculating formulas are proposed. A practical example shows that the difference between measured and calculated results is small, indicating that the present calculating methods could be used in design and management of practical engineering projects.
文摘目的探讨经内侧入路单切口治疗胫骨平台后内侧骨折的手术疗效。方法选取我院2006年10月至2010年6月间经内侧入路治疗的胫骨平台后内侧骨折21例。取膝关节内侧切口显露胫骨平台内侧髁骨折块,撑开骨折间隙,C臂机监视下经此间隙撬拨,植骨填充复位外侧平台满意后以克氏针固定;直视下复位胫骨平台后内侧骨折,以4.5mm空心螺钉和支持钢板内固定。术后进行临床和影像学随访,随访终末行美国特种外科医院(the Hospital for Special Surgery,HSS)膝关节评分和骨关节炎Kellgren-Lawrence评分。结果 15例患者随访10～13个月,平均11.5个月。6例患者失访,剔除出组。术后即刻和随访终末的胫骨平台内翻角和胫骨内侧平台后倾角的差异无统计学意义(P>0.05)。随访终末时,屈膝100°～135°,平均122.3°;伸膝0°～7°,平均2.9°。膝关节HSS评分78～94分,平均86.8分;13.33%(2/15)患者为轻度骨关节炎;无感染、皮肤坏死、内固定松动或断裂等并发症发生。结论经内侧手术入路能够同时修复胫骨平台内侧髁骨折和后外侧平台塌陷骨折,坚强内固定可以充分防止力线改变和骨折再移位,治疗胫骨平台后内侧骨折疗效满意。
