Percutaneous screw fixation of undisplaced fractures of the scaphoid waist has gained popularity but remains technically demanding. This study describes a transtrapezial modification of the volar percutaneous technique and reports the results in 41 patients. The patients were evaluated at a mean of 36 months (range 14-68 months) after surgery. All fractures healed within 10 weeks (mean 6.4 weeks). Functional ranges of wrist motion and grip strength were achieved in all patients. Radiographs showed accurate central placement of the screw in all patients and no degenerative changes were seen at the scaphotrapezial joint. In three patients, the screw was removed because it was prominent at the scaphotrapezial joint.