a biodegradable copolymer network , which is particularly suited for use in applications such as interbody implants for bone fusion , is provided . the biodegradable copolymer network of the present invention is biodegradable yet provides sufficient mechanical strength for use in procedures such as spinal fusion . also provided are methods of producing said biodegradable copolymer network , methods of delivery of biologically active substances , implants comprising said biodegradable copolymer network and methods of administering bioactive and in particular , osteoinductive , substances .