Evaluation of AlloMax Acellular Dermal Matrix for Objective Collagen Deposition

Acellular dermal matrix products are popular in various aspects of surgical reconstruction including hernia repairs and breast reconstructions. The goal of this study was to determine quantitative collagen weights of AlloMax (C. R. Bard, Inc. [Davol], Warwick, RI) and of contralateral dermis for composition comparison. A rehydrated sample of AlloMax was subcutaneously implanted on the dorsum of 18 male Wistar rats. Rats were randomly assigned to groups on the basis of in vivo implant time: 1, 3, and 6 weeks. At the end of the implant time, the AlloMax was removed and a section of contralateral dermis was excised as a control. Hydroxyproline, rat Collagen I and Collagen III, and neoangiogenesis were determined in the sections. The results are reported as mean +/- standard error of the mean. Analysis of variance was used to evaluate the between-group differences. A p value of 0.05 or less was considered significant. Hydroxyproline was significantly increased in the 6-week AlloMax implant (26.19 +/- 1.05 vs. 15.03 +/- 3.29). Collagen I and Collagen III were significantly increased following 3 weeks in vivo (612.5%+/- 98.0 vs. 312.9%+/- 82.7, p<0.05 Collagen I). Neoangiogenesis was significantly increased at 3 and 6 weeks in vivo (2.3 +/- 0.3 and 1.9 +/- 0.3). Acellular AlloMax was rapidly incorporated into the rat dorsum. The measurement parameters were greater than or equivalent to contralateral dermis in this study.