Surgical treatments such as nerve grafting, tendon lengthening, tendon transfers, and limb lengthening and shortening were used extensively during this time. Patients with residual paralysis were treated with braces and taught to compensate for lost function with the help of calipers, crutches and wheelchairs. The use of devices such as rigid braces and body casts, which tended to cause muscle atrophy due to the limited movement of the user, were also touted as effective treatments. Massage and passive motion exercises were also used to treat polio victims. Most of these treatments proved to be of little therapeutic value, however several effective supportive measures for the treatment of polio did emerge during these decades including the iron lung, an anti-polio antibody serum, and a treatment regimen developed by Sister Elizabeth Kenny.