Comparison of host response to polypropylene and non-cross-linked porcine small intestine serosal-derived collagen implants in a rat model.
OBJECTIVE
To compare the host response, architectural integration and tensile strength of polypropylene and porcine small intestine submucosa-derived implants in a rat model.


METHODS
Experimental study.


METHODS
Center for Surgical Technologies, Faculty of Medicine, Katholieke Universiteit Leuven, Belgium.


METHODS
Forty-eight adult male Wistar rats weighing 220-250 g randomised to receive either implant.


METHODS
Full thickness abdominal wall defects were primarily repaired with polypropylene mesh (Marlex) (MX group) or porcine small intestine submucosa (Surgisis) (SIS group). Animals were sacrificed at 7, 14, 30 and 90 days after implantation.


METHODS
The presence of herniation, infection and intra-peritoneal adhesions. Change in thickness and tensile strength of implant. Histopathological and immunohistochemical appearances of inflammatory response and collagen deposition.


RESULTS
Implants from the SIS group showed a short term increase in thickness in the first 14 days. Formation of adhesions was significantly more intense in the MX group at 30 days, and more extensive in the SIS group at 90 days. Tensile strength increased over time in both groups but was significantly lower in the SIS group than the MX group at 30 days. Implants in the MX group showed a more pronounced inflammatory response and more pronounced new vessel formation than the SIS group. Collagen formation was initially more fibrous and better organised in the MX group but became greater in the SIS group at 90 days.


CONCLUSIONS
Biologically derived implant material induced a less pronounced inflammatory response and differences in collagen deposition. At 30 days tensile strength was weaker in the biological implant group but was equivalent by 90 days. These differences may have implications for the in vivo performance of the materials.
Konstantinovic
Maja L
ML
Center for Surgical Technologies, Faculty of Medicine, Katholieke Universiteit, Leuven, Belgium.
Lagae
Pieter
P
Zheng
Fang
F
Verbeken
Eric K
EK
De Ridder
Dirk
D
Deprest
Jan A
JA
D034861:Abdominal Wall / Q000601:surgery*; D000704:Analysis of Variance; D000818:Animals; D003094:Collagen / Q000276:immunology*; D003432:Cross-Linking Reagents; D007150:Immunohistochemistry / Q000379:methods; D007249:Inflammation / Q000276:immunology; D007413:Intestinal Mucosa / Q000276:immunology; D007421:Intestine, Small / Q000276:immunology*; D008297:Male; D011126:Polypropylenes / Q000276:immunology*; D019736:Prostheses and Implants; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012704:Serous Membrane / Q000276:immunology*; D013526:Surgical Mesh; D013718:Tensile Strength / Q000502:physiology; D000267:Tissue Adhesions / Q000276:immunology
D003432:Cross-Linking Reagents; D011126:Polypropylenes; D003094:Collagen