AGE RELATED CHANGES IN THE ELASTIC FIBER SYSTEM OF THE INTERFOVEOLAR LIGAMENT

SUMMARY: In order to evaluate age related changes of the elastic fiber system in the interfoveolar ligament, we studied the deep inguinal ring from 33 male cadavers aged from stillborn to 76 years. Selective and alternated staining methods for elastic fibers were performed to differentiate oxytalan, elaunin, and mature elastic fibers. We confirmed quantitative changes of the elastic fiber system with aging. There was a significant and progressive reduction of the oxytalan fibers (responsible for tissue resistance) and a significant increment in the mature elastic and elaunin fibers (responsible for tissue elasticity). Furthermore, there were structural changes in the thickness, shortness and curling of these mature elastic fibers. These changes induced loss of the elastic fiber function and loss of the interfoveolar ligament compliance. These factors predispose individuals to the development of indirect inguinal hernias that frequently emerge in adults and aged individuals, especially above the fifth decade. DESCRIPTORS: Elastin. Inguinal hernia. Aging. Extracellular matrix. Transversalis fascia. Direct inguinal hernias seem to re-sult from weakening of the transversa-lis fascia on the floor of the inguinal canal 1. It has been demonstrated that alterations in the collagen component, and in the elastic fibers of the extracel