title: External fixation using locking plate in distal tibial fracture: a finite element analysis.
abstract: BACKGROUND
  External fixation of tibial fractures using a locking plate has been reported with favorable results in some selected patients. However, the stability of external plate fixation in this fracture pattern has not been previously demonstrated. We investigated the stability of external plate fixation with different plate-bone distances.
  
  
  METHODS
  In this study, the computational processing model of external fixation of a distal tibial metaphyseal fracture utilizing the contralateral femoral less invasive stabilization system plate was analyzed. The plate was placed on the anteromedial aspect of tibia with different plate-bone distances: 1, 10, 20, and 30 mm.
  
  
  RESULTS
  Under axial load, the stiffness of construct in all groups was higher than intact tibia. Under axial load with an internal rotational force, the stiffness of construct with 1 and 10 mm plate-bone distances was similar to that of an intact tibia and the stiffness of the construct with 20 and 30 mm distances was lower than that of an intact tibia. Under axial load with an external rotational force, the stiffness of the construct in all groups was lower than that of an intact tibia. The maximum plate stresses were concentrated at the two most distal screws and were highest in the construct with the 10 mm plate-bone distance, and least in the construct with a 1 mm plate-bone distance.
  
  
  CONCLUSIONS
  To guarantee a stable external plate fixation in distal tibial fracture, the plate-bone distance should be less than 30 mm.
authors.affiliation: Department of Orthopaedic Surgery, Ningbo Sixth Hospital, No. 1059 East Zhongshan Road, Ningbo, 315040, Zhejiang province, China.
authors.forename: Jingwei
authors.initials: J
authors.lastname: Zhang
authors.forename: Nabil
authors.initials: N
authors.lastname: Ebraheim
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Xianfeng
authors.initials: X
authors.lastname: He
authors.forename: Joshua
authors.initials: J
authors.lastname: Schwind
authors.forename: Jiayong
authors.initials: J
authors.lastname: Liu
authors.forename: Limei
authors.initials: L
authors.lastname: Zhu
mesh_terms: D015519:Bone Density / Q000502:physiology; D001860:Bone Plates; D003198:Computer Simulation; D020342:Finite Element Analysis; D005592:Fracture Fixation / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008297:Male; D008954:Models, Biological; D013312:Stress, Physiological; D013977:Tibia / Q000502:physiology*; D013978:Tibial Fractures / Q000503:physiopathology / Q000601:surgery*