A biomechanical comparison of micromotion after ankle fusion using 2 fixation techniques: intramedullary arthrodesis nail or Ilizarov external fixator. Academic Article Article uri icon

Overview

MeSH

  • Aged
  • Biomechanical Phenomena
  • Bone Density
  • Cadaver
  • Humans
  • Middle Aged
  • Range of Motion, Articular
  • Weight-Bearing

MeSH Major

  • Ankle Joint
  • Arthrodesis
  • Bone Nails
  • External Fixators
  • Fracture Fixation, Intramedullary
  • Ilizarov Technique

abstract

  • In difficult ankle arthrodesis situations, intramedullary (IM) arthrodesis nails and external fixation are often considered in lieu of standard fusion techniques. The purpose of this study was to compare the amount of micromotion measured across an ankle fusion site stabilized with either an IM nail or with the Ilizarov external fixator. The relative bone mineral density of 8 pairs of human cadaveric lower legs was measured by DEXA scanning. One specimen from each pair was randomly assigned to be stabilized with a new generation IM nail and the other with an Ilizarov external fixator. Specimens were tested in compression, rotation, and dorsiflexion. Optical motion capture was used to measure the direct motion occurring at the fusion site. No significant difference was found between the axial displacements (p = 0.94), torsional displacement (p = 0.07), or the dorsiflexion angular displacement (p = 0.28) for the IM rod group and the external fixation group. A weak correlation was found between BMD and displacement. Both the new generation IM nail and the Ilizarov external fixator imparted excellent stability to the fusion site despite a wide range of bone mineral densities. Medialization of the talus, the ability to compress the nail, and the addition of a posterior-to-anterior locking screw were thought to improve the performance of the nail. Both IM nail and Ilizarov external fixation provided excellent fusion site stability. The decision of which implant to use for complex arthrodesis should be dictated by the clinical needs.

publication date

  • March 2008

has subject area

  • Aged
  • Ankle Joint
  • Arthrodesis
  • Biomechanical Phenomena
  • Bone Density
  • Bone Nails
  • Cadaver
  • External Fixators
  • Fracture Fixation, Intramedullary
  • Humans
  • Ilizarov Technique
  • Middle Aged
  • Range of Motion, Articular
  • Weight-Bearing

Research

keywords

  • Comparative Study
  • Journal Article

Identity

Language

  • eng

Digital Object Identifier (DOI)

  • 10.3113/FAI.2008.0334

PubMed ID

  • 18348832

Additional Document Info

start page

  • 334

end page

  • 341

volume

  • 29

number

  • 3