The authors present an analysis of the results of the surgical treatment of pseudoarthorsis of scaphoid by the technique after Matti-Russe consisting in spongioplasty and bridging the pseudoarthrosis with corticospongy graft in 35 patients treated in the period 1977-1987. Bone healing was achieved in 83 per cent, in 63 per cent there was a significant remission of subjective complaints. In 57 per cent the osteoarthritic changes of carpus made progress, out of which in 50 per cent there were preoperatively present symptoms of carpal instability, i. e. scapho-lunate dissociation of more than 2 mm and/or increase in volar flexion of scaphoid or its fragments with the loss of colinearity of longitudinal axes of radius and axes of capitatum. Instability of the carpus was never improved by the operation and significantly corelated with the subjective complaints in follow-up examination. The reconstruction operation is not indicated for the pseudoarhtrosis of scaphoid in case of the presence of carpal instability or advanced osteoarthritis. More suitable is to perform later arthrodesis of the wrist. Key words: pseudoarthrosis of scaphoid, reconstruction operation after Matti-Russe, instability of the wrist.