the invention relates to an injectable biocompatible composition based on a polymeric support as well as to a method for producing it , which composition which comprises at least one hydrophilic polymer , wherein the polymer is polymerizable in situ to form a gel , and wherein the hydrophilic polymer is crosslinkable serum albumin or crosslinkable serum protein . the composition can be used in the restoration , the reconstruction , and / or the replacement of tissues and / or organs , or as a drug release implant in mammals . the composition is particularly suitable for treating cartilage disorders of a diseased or injured articular site in a mammal .