title: A novel nail providing more biomechanical rotational and axial stability than conventional interlocking nail in femur complex fracture model.
abstract: OBJECTIVE
  Inter-fragmentary rotational and axial instabilities are major challenges in nailing of complex or comminuted fractures. We aimed to compare the inter-fragmentary rotational and axial stability of novel anti-rotation interlocking nail and the conventional interlocking nail in complex or comminuted femur shaft fractures.
  
  
  METHODS
  Twenty composite femurs were divided into two groups, 30 mm was resected from the mid-portion of all composite femurs. The inter-fragmentary rotational and axial stabilities were assessed.
  
  
  RESULTS
  Between 10-N m external and 6-N m internal rotation torques, mean maximum inter-fragmentary rotational arc motion in the novel nails was 1.63 mm and 291 % less than that of the conventional nails (6.38 mm, P = 0.000). Between 150 N distraction and 2300 N compression, mean axial motion in the novel nails was 0.8 mm and 257 % less than that of the conventional nails (2.86 mm, p = 0.000).
  
  
  CONCLUSIONS
  An anti-rotational novel nail is superior to the conventional interlocking nail in terms of maximum inter-fragmentary rotational and axial stabilities in complex and comminuted femur shaft fractures.
authors.affiliation: Department of Orthopaedics and Traumatology, Faculty of Medicine, Şifa University, Sanayi St. No: 7, Bornova, 35040, Izmir, Turkey. aakaraarslan@yahoo.com.
authors.forename: A A
authors.initials: AA
authors.lastname: Karaarslan
authors.affiliation: Department of Orthopaedics and Traumatology, Catalca Ilyas Cokay Hospital, Catalca, 34540, Istanbul, Turkey.
authors.forename: N
authors.initials: N
authors.lastname: Acar
authors.affiliation: Department of Orthopaedics and Traumatology, Faculty of Medicine, Şifa University, Sanayi St. No: 7, Bornova, 35040, Izmir, Turkey.
authors.forename: Y
authors.initials: Y
authors.lastname: Örgen
authors.affiliation: Department of Orthopaedics and Traumatology, Faculty of Medicine, Şifa University, Sanayi St. No: 7, Bornova, 35040, Izmir, Turkey.
authors.forename: H
authors.initials: H
authors.lastname: Aycan
authors.affiliation: Department of Biomechanics, Faculty of Medicine, Dokuz Eylul University, Inciralti, 34340, Izmir, Turkey.
authors.forename: F
authors.initials: F
authors.lastname: Ertem
authors.affiliation: Department of Orthopaedics and Traumatology, Faculty of Medicine, Şifa University, Sanayi St. No: 7, Bornova, 35040, Izmir, Turkey.
authors.forename: E
authors.initials: E
authors.lastname: Sesli
mesh_terms: D001696:Biomechanical Phenomena; D001858:Bone Nails; D001863:Bone Screws / Q000145:classification; D005264:Femoral Fractures / Q000601:surgery*; D005594:Fracture Fixation, Intramedullary; D006801:Humans; D012399:Rotation
keywords: Femoral nail; Femur comminuted fractures; Fracture union; Inter-fragmentary distraction; Inter-fragmentary rotation