Comparison of Marlex mesh and microporous teflon sheets when used for hernia repair in the experimental animal

A new prosthetic material, microporous expanded Teflon (PTFE) was compared with Marlex mesh in the experimental animal. Triangular pieces of each material were placed beneath the transversalis fascia in the right and left groins of seven white New Zealand rabbits (mean weight, 8 kg). The animals were sacrificed are two week intervals. PTFE was found to retain its position and shape without local or peritoneal reaction. By contrast, Marlex mesh showed marked inflammatory reaction and scarring with complete distortion of the graft. Microscopically, PTFE was completely invaded by fibroblast at eight weeks, with flat orientation of graft to the fibrous tissue forming a "neofascia". In contrast, Marlex mesh lacked fibroblastic incorporation of the graft with marked scarring and distortion. These findings suggest that PTFE could be a useful fascial buttress in inguinal hernia repair where Marlex mesh is now used.