Comparative study of fracture gap motion in external fixation

Among the factors determining the stability of external fi xator osteosyntheses the deciding factor is the confi guration of the montage. The authors examined the stability of unilateral and V-forms used in crural fractures together with a Budapest University of Technology task force. They performed osteotomy on cadaver bones and used a total of 12 kinds of montage variations. The various montages were exposed to 5 types of static load, their stability was tested, and fi nite element model experiments were performed. The load tests were evaluated by computer and the charts were compared. It was concluded that unilateral montages are most stable when the pins are placed in the greatest possible distance from each other within one segment and the rods are far from each other. In case of V-frame symmetrically inserted pins should be avoided in the second plane for better stability. Finite element model has verifi ed the biomechanical observations. During the biomechanical experiment the authors have gained useful experiences for further clinical practice.

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“…Biomechanical tests were performed in order to determine the right montage configuration 13,14,15,16,17,18,19 . …”

mentioning

confidence: 99%

Biomechanical testing and finite element analysis of fixator montages

Kádas¹,

Tököly²,

Bı́ró³

et al. 2011

Biomech Hung

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“…If the movement between fragments is to be controlled to achieve an optimal mechanical environment within the fracture gap, both the fixation stiffness and the bony loading have to be known. Numerous stiffnesses of fixation devices have been reported in the literature (Lippert and Hirsch, 1974;Kristiansen et al, 1987;Goodship et al, 1988;Cunningham et al, 1989;Hoffmann et al, 1991;Kenwright et al, 1991;Goodship et al, 1993). However, only few studies specify more than axial or bending stiffness values (Hoffmann et al,199 1).…”

Section: Fixation Stiffnessmentioning

confidence: 99%