title: Clinical outcomes and prognostic factors depending on implant design in the treatment of proximal humeral fractures: A retrospective study.
abstract: OBJECTIVE
  We aimed to examine the clinical outcomes of proximal humeral fractures treated with different intramedullary nail shapes.
  
  
  METHODS
  Thirty-seven patients were divided into two groups depending on the implant shape. We also defined F group as a subgroup of fracture classification.
  
  
  RESULTS
  In the F group, the flexion of the shoulder joint was significantly greater in S (mean, 134.6°) than in C groups (mean, 109°) (p = 0.04). The complication rate was significantly larger in the C group (p = 0.04).
  
  
  CONCLUSIONS
  Patients with one kind of fracture and who were treated with straight nails had better outcomes.
authors.affiliation: Department of Orthopedic Surgery, Seikeikai Hospital, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Ueyama
authors.affiliation: Department of Orthopedic Surgery, Seikeikai Hospital, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Yano
authors.affiliation: Department of Orthopedic Surgery, Aeba Hospital, Japan.
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Kanemura
authors.affiliation: Department of Orthopedic Surgery, Seikeikai Hospital, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Gotani
authors.affiliation: Department of Orthopedic Surgery, Aeba Hospital, Japan.
authors.forename: Sadanao
authors.initials: S
authors.lastname: Ito
authors.affiliation: Department of Orthopedic Surgery, Seikeikai Hospital, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Sakanaka
keywords: Fracture; Humerus; Intramedullary nail; Trauma