[Treatment of Seinsheimer type V subtrochanteric femoral fractures with dynamic hip screw and shape memory alloy bow-teeth screw].

Objective:To investigate the clinical effect of Seinsheimer type Ⅴsubtrochanteric femoral fractures with dynamic hip screw and shape memory alloy bow teeth screw. Methods:Twelve patients with Seinsheimer type Ⅴsubtrochanteric femoral fractures were retrospectively analyzed. There were 8 males and 4 females with an average age of 53 years (range 31 to 65 years). Seven cases were caused by traffic accident,4 cases by falling from hight,1 case by heavy object. According to the Seinsheimer classification,all the cases were type Ⅴ fractures. All the cases accepted the surgical treatment with dynamic hip screw and shape memory alloy bow teeth screw fixation. Results:The mean period of follow up was 28 months (range 20 to 38 months). All the cases obtained bone union in average 3.3 months(from 3 to 4.5 months). There were no complications such as deep infection,deep vein thrombosis,pulmonary embolism and bone nonunion. The results of clinical evaluation according to Merle d'Aubigne scores were 16.75±1.14 and excellent in 4 cases,good in 8 cases. Conclusion:Application of dynamic hip screw and shape memory alloy bow teeth screw as a superior option can get satisfactory reduction with reliable fixation and will be one of a better choice for fixation of Seinsheimer type Ⅴsubtrochanteric femoral fractures.