A murine model of volumetric muscle loss and a regenerative medicine approach for tissue replacement.

Volumetric muscle loss (VML) resulting from traumatic accidents, tumor ablation, or degenerative disease is associated with limited treatment options and high morbidity. The lack of a reliable and reproducible animal model of VML has hindered the development of effective therapeutic strategies. The present study describes a critical-sized excisional defect within the mouse quadriceps muscle that results in an irrecoverable volumetric defect. This model of VML was used to evaluate the efficacy of a surgically placed inductive biologic scaffold material composed of porcine small intestinal submucosa-extracellular matrix (SIS-ECM). The targeted placement of an SIS-ECM scaffold within the defect was associated with constructive tissue remodeling including the formation of site-appropriate skeletal muscle tissue. The present study provides a reproducible animal model with which to study VML and shows the therapeutic potential of a bioscaffold-based regenerative medicine approach to VML.

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