The present invention is directed to filamentous fibers and methods of use for treating a damaged disc, illustratively for treatment of a degenerative or injured vertebral disc. The filamentous fiber may be dehydrated such that filamentous fiber into the damaged disc such that the filamentous fiber absorbs fluid, expands, and provides cushioning to the damaged disc. In illustrative methods, the filamentous fiber is inserted into the disc via a cannulating needle.