PMID: 8945663Dec 1, 1996Paper

Formalin fixation strongly influences biomechanical properties of the spine

Journal of Biomechanics
H J WilkeL E Claes

Abstract

As fresh human cadaveric spine specimens for in vitro testing are hard to obtain and carry a potential risk of infection, the possibility of using embalmed spine specimens has been considered. The cross-linking effect of formalin fixation, however, raises uncertainties regarding the biomechanical likeness of preserved specimens. They have been reported to be stiffer, but no quantitative data exist. The purpose of this study was to determine the biomechanical differences between fresh and formalin-fixed spine specimens, using L1-2 motion segments from six 16-week-old calf spines. The range of motion and neutral zone were determined in flexion-/extension, left/right axial rotation, and right/left lateral bleeding. The range of motion decreased in the formalin fixed specimens by as much as 80%, and the neutral zone by as much as 96%. The results of this study therefore imply that, for biomechanical testing, formalin-fixed specimens are not representative of the in vivo conditions.

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