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Report on the immediate and late results obtained in the period from January 1973 to December 1976 in a series of 44 patients suffering from a spastic syndrome who were operated on by selective partial lumbar radiculotomy. The intervention which mainly consisted of a partial separation of the individual radiculae of the posterior lumbar and first sacral roots was followed by a distinct improvement of the clinical picture in 30 patients without observing aneurlogical, especially sensitive deficit or immediate or later complications. The indication for this intervention is established together with the other specialists concerned with the care and the rehabilitation of the patient. Only such patients are selected in whom the spasticity is not useful and who still can carry their body-weight. No operation is in particular carried out in the presence of considerable paresis of the extensors and in patients who have for a long time been able to walk and stand. Favourable results can be expected in para-tetraspasticity and in patients who, when standing with support, show equinism, hyperadduction or crossing of the legs, hyperextension and internal rotation.