title: [Biomechanical evaluation of nickel-titanium shape-memory alloy enclosed interlocking intramedular nail].
abstract: OBJECTIVE
  To study the biomechanical characteristics of Ni-Ti shape-memory alloy-enclosed interlocking intramedular nail Ni-Ti En for clinical application.
  
  
  METHODS
  Six transverse fractures were induced in 6 fresh humeral shafts and fixed with Ni-Ti En, plate, interlocking intramedullary nail, and Ender nail, respectively. The specimens then underwent stress analysis for comparison of the bending strength, twisting force, and flexibility.
  
  
  RESULTS
  The bending strength of Ni-Ti En was not significantly different from that of the plate and better than ender's nail; the twisting force of the interlocking intramedullary nail was comparable with the plate, but better than Ender nail.
  
  
  CONCLUSIONS
  Ni-Ti Enpossess good biomechanical property to meet the demand of osteosynthesis, and its less stress protection, freedom of distant nail locking, flexibility and stable fixation may accelerate fracture healing.
authors.affiliation: Department of Orthopedics, Second Affiliated Hospital of Guangzhou Medical College, Guangzhou 510260, China.
authors.forename: Yan-ming
authors.initials: YM
authors.lastname: Cao
authors.forename: Wei-dong
authors.initials: WD
authors.lastname: Zhao
authors.forename: Mei-chao
authors.initials: MC
authors.lastname: Zhang
authors.forename: Kan
authors.initials: K
authors.lastname: Bao
authors.forename: Guo-zu
authors.initials: GZ
authors.lastname: Da
mesh_terms: D001696:Biomechanical Phenomena; D001858:Bone Nails; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D006810:Humeral Fractures / Q000503:physiopathology / Q000601:surgery; D009532:Nickel; D014025:Titanium
chemical_list: C040654:titanium nickelide; D009532:Nickel; D014025:Titanium