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Biomechanical properties of vaginal tissue: Preliminary Results

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2008
auteur(s) Rubod Chrystèle; Boukerrou Malik; Brieu Mathias; Clay Jean-Charles; Dubois Patrick; Cosson Michel
journal (abréviation) International Journal of Urogynecology (Int Urogynecol J)
volume (numéro) 19 (6)
  
pages 811 – 816
résumé Purpose
In order to develop a more accurate cure of pelvic organ prolapse (POP), the aim of this study was to characterize the biomechanical properties of vaginal tissue.

Materials and Methods
Prolapsed vaginal tissues were extracted during the POP cure (5 patients) and on 5 cadavers without pelvic floor dysfunction (non prolapsed tissue) with agreement of the ethic committee. Uni axial tension was carried out at constant strain rate. The stress-stretch curves obtained were analysed.

Results
Individual reproducibility was good; dispersion among patients was linked to individual previous history. Experimental results highlight that there is no linear relationship between stress and stretch and that the deformation before rupture appearance are very large. Thus, the mechanical behaviour of vaginal tissue has to be defined as hyperelastic with large deformation before rupture appearance.

Conclusions
Even if the soft tissues involved in pelvic static are obviously submitted to large deformation, during obstetrical events, their mechanical behaviour were defined, in literature, by linear elasticity in small deformation. The hyper elastic behaviour of vaginal tissue was proved for the first time. Linear elastic behaviour in small strain, defined by Young modulus, can not be used for characterization of the soft tissues, defining mechanical properties of synthetic prostheses for POP cure..
mots clés Pelvic organ prolapse, vaginal tissue, biomechanics, hyper elastic mechanical behaviour, soft tissue.
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