Gelatin Sponge: HAMC: The University of Toronto developed a new biomaterial called hydrogel of HAMC as a drug carrier for SCI treatment.189 Compared with intrathecal or intraperitoneal EPO injection, HAMC EPO delivery had better results in tissue sparing and functional recovery post‐SCI.190 Interestingly, HAMC had some therapeutic functions on its own,189, 191 such as improving the outcome of post‐traumatic syringomyelia.191 Intrathecal injection of HAMC reduced IL‐1α levels and lesion volume and finally promoted neurobehavioral recovery from arachnoiditis caused by SCI. The gene discussed is EPO; the disease is syringomyelia.