The present invention is directed to a method of repairing an annulus. This method involves providing a collagen gel composition that includes collagen gel and a cross-linking agent. The collagen gel composition is injected into, around, or near an annulus repair site under conditions to repair the annulus. The cross-linking agent is included with or added to the collagen gel in an amount sufficient to cause cross-linking of the collagen gel and enable integration of the collagen gel composition with tissue near where said collagen gel composition is injected. Also disclosed is collagen gel composition.
