The aim of the study was the estimation of the results of surgical correction in pronation or supination forearm deformity.Material and methods. Clinical material comprised 19 patients, both sexes, in age from 2 years 3 months to 14 years who were treated in years 2001-2007 because of forearm deformation due to perinatal brachial plexus palsy. Evaluation of the results of surgical treatment has been performed in all cases with using Al-Qattan's scale.Results. As a result of performed tenomioplastic operations in all operated patients functional position of forearm has been achieved (grade 3 in Al-Qattan's scale)., and in 8 cases additionally good range of pronation and supination (grade 4 in Al-Qattan's scale).Conclusions. The necessity of forearm deformity correction in perinatal brachial plexus palsy may concern patients who have been treated microsurgically in very early childhood, and also patients who haven't been qualified to primary surgical treatment because of significant improvement of upper limb function as a result of rehabilitation. Tenomioplastic operations used in forearm position correction should be reserved for patients without fixed contracture who have possibility of forearm passive rotation moves. These procedures are burdened by low risk of complications and with proper qualification they can provide significant improvement of upper limb functional efficiency.