A collagen material having a form of thin fibrils generally free of fibril-bundling proteogylcan interactions, and a method for providing the thin fibril collagen material from native collagen fibers. The method uses proteoglycan antibodies to disassociate the proteoglycan interactions in bundled collagen fibrils to provide the constituent fibrils. The process can be used as a model for arthritis and the resulting fibrils can be used to form new extracellular matrix biomaterials and new tissues.