The objective of this study is reconstruction of functional handgrip in tetraplegic patients, using transfers of the forearm tendons. Authors present two case studies of tendon transfers--the first case introduces reconstruction of fingers and thumb extension--the second case introduces reconstruction of fingers and thumb flexion. The two case studies explain basic principles of tendon transfers and assessment criterions. The aim of this study is to point out the possibility to create functional unit from a plegic hand by surgical intervention, and to improve significantly quality of patients' lives.