title: Biomechanical evaluation of different internal fixation methods for humerus shaft fractures with medial butterfly fragment.
abstract: OBJECTIVE
  The aim of this study was to compare the biomechanical strength of three fixation methods in humerus shaft fractures with medial butterfly fragment.
  
  
  METHODS
  An AO 12B2 fracture with butterfly fragment was created in 21 synthetic cortical shell humeri. Humeri were divided into 3 groups which underwent bridge plating, antegrade intramedullary nailing or retrograde intramedullary nailing. Rotational and four-point bending test displacement curves were obtained.
  
  
  RESULTS
  Mean displacement values in the torsion tests were 37.38 (range: 25.75 to 55.69) mm in the bridge plating group, 26.55 (range: 21.25 to 41.81) mm in the antegrade nailing group, and 33.23 (range: 27.50 to 46.45) mm in the retrograde nailing group. Mean displacement values in the four-point bending test were 3.27 (range: 2.54 to 3.73) mm in the bridge plating group, 3.17 (range: 2.69 to 3.55) mm in the antegrade nailing group, and 3.15 (range: 2.10 to 4.03) mm in the retrograde nailing group. No significant difference was found among the groups (p>0.05).
  
  
  CONCLUSIONS
  The biomechanical stability of bridge plating, antegrade intramedullary nailing and retrograde intramedullary nailing appears to be similar in the fixation of humerus shaft fractures with medial butterfly fragment.
authors.affiliation: Department of Orthopedics and Traumatology, Bolu İzzet Baysal State Hospital, Bolu, Turkey. turken.aykut@gmail.com
authors.forename: Mehmet Aykut
authors.initials: MA
authors.lastname: Türken
authors.forename: Mehmet
authors.initials: M
authors.lastname: Akdemir
authors.forename: Bora
authors.initials: B
authors.lastname: Uzun
authors.forename: Mustafa
authors.initials: M
authors.lastname: Ozkan
mesh_terms: D001696:Biomechanical Phenomena; D001858:Bone Nails; D001863:Bone Screws; D018786:Bone Substitutes; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods*; D005594:Fracture Fixation, Intramedullary / Q000379:methods; D018460:Fractures, Comminuted / Q000601:surgery*; D006801:Humans; D006810:Humeral Fractures / Q000601:surgery*; D008953:Models, Anatomic; D016059:Range of Motion, Articular
chemical_list: D018786:Bone Substitutes