54. ONE YEAR OUTCOMES AFTER REGENERATIVE PERIPHERAL NERVE INTERFACE SURGERY FOR POSTAMPUTATION PAIN: RESULTS OF A PROSPECTIVE CLINICAL TRIAL. (1st April 2022) - Ganesh Kumar, Nishant; Kubiak, Carrie A.; Hamill, Jennifer; Kim, Hyungjin M.; Tinney, Melissa J.; Roth, Randy S.; Geisser, Michael E.; Cederna, Paul; Kemp, Stephen W.P.; Kung, Theodore A.