title: [Treatment of Seinsheimer type V subtrochanteric femoral fractures with dynamic hip screw and shape memory alloy bow-teeth screw].
abstract: OBJECTIVE
  To investigate the clinical effect of Seinsheimer type V subtrochanteric femoral fractures with dynamic hip screw and shape memory alloy bow-teeth screw.
  
  
  METHODS
  Twelve patients with Seinsheimer type V subtrochanteric 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.
  
  
  CONCLUSIONS
  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 V subtrochanteric femoral fractures.
authors.affiliation: Department of Orthopaedics, Affiliated Changhai Hospital of the Second Military Medical University, Shanghai 200433, China. deformitya@126.com
authors.forename: Xin-Wei
authors.initials: XW
authors.lastname: Liu
authors.forename: Pan-Feng
authors.initials: PF
authors.lastname: Wang
authors.forename: Qing-Ge
authors.initials: QG
authors.lastname: Fu
authors.forename: Chun-Cai
authors.initials: CC
authors.lastname: Zhang
authors.forename: Shuo-Gui
authors.initials: SG
authors.lastname: Xu
authors.forename: Jia-Can
authors.initials: JC
authors.lastname: Su
authors.forename: Si-Hua
authors.initials: SH
authors.lastname: Pan
mesh_terms: D000328:Adult; D000368:Aged; D000497:Alloys; D001863:Bone Screws; D005260:Female; D005264:Femoral Fractures / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery* / Q000628:therapy; D005500:Follow-Up Studies; D006615:Hip / Q000601:surgery*; D006801:Humans; D008297:Male; D055595:Mechanical Phenomena; D008875:Middle Aged; D020127:Recovery of Function; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D000497:Alloys