Book excerpt: Powered Upper Limb Prostheses deals with the concept, implementation and clinical application of utilizing inherent electrical signals within normally innervated residual muscles under voluntary control of an upper limb amputee. This amplifies these signals by battery-powered electrical means to make a terminal device, the prosthetic hand, move to perform intended function. The reader is introduced to various facets of upper limb amputations and their clinical management in both children and adults. The authors from Canada, USA and Great Britain are well known practicioners, academics and researchers in the field. The book has over 130 illustrations and contains an extensive bibliography.