PMID: 8950664Nov 1, 1996Paper

An instrumented spacial linkage for monitoring relative three-dimensional motion between fracture fragments

Journal of Biomechanical Engineering
T N GardnerP J Kyberd

Abstract

A mechanical linkage with electro-magnetic sensors (a displacement transducer) is described, which may be used to measure accurately the relative motion at a bony junction such as a fracture. The linkage may be fixed to bone screws of externally-fixated fractures during routine patient activity, to measure three-dimensional inter fragmentary displacements arising from dynamic loading. Movements of the linkage are monitored by six Hall Effect devices for the six degrees of freedom (three orthogonal translations and three rotations about the translating axes). Measurements are made within error bounds of +/- 0.025 mm and +/- 0.025 deg over a range of 5 mm for the two orthogonal transverse translations, 8 mm for axial translation and 8 deg for the three rotations. Movements at the linkage, remote from the fracture, are then translated mathematically to the fracture site, assuming rigid screw contact with the bone. Displacements of the distal fragment in relation to the proximal, at the fracture center, can then be expressed anatomically through anterior, medial, and distal translations, and rotations in the sagittal, coronal, or transverse planes.

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Citations

Apr 1, 1997·Journal of Biomechanics·T N GardnerJ Kenwright
Feb 27, 2001·Clinical Biomechanics·T N GardnerJ Kenwright
Dec 1, 1996·Clinical Biomechanics·T N GardnerJ Kenwright
Jun 6, 2003·Medical Engineering & Physics·Trevor Noel Gardner, Sanjay Mishra
Jul 30, 1999·Medical Engineering & Physics·T N Gardner, M Weemaes
Aug 29, 2006·Journal of Biomechanics·Gianluca Gatti, Guido Danieli
Oct 11, 2005·Clinical Biomechanics·A J S RenardA van Kampen
Feb 27, 2009·Clinical Orthopaedics and Related Research·L E Claes, J L Cunningham
Aug 28, 2001·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·P J OgrodnikP B Thomas
Feb 23, 2002·Clinical Orthopaedics and Related Research·Georg N DudaMichael Raschke
Oct 17, 2007·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·P J OgrodnikP B Thomas
May 31, 2001·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·S Mishra, T N Gardner

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