We report our experience with correction of radially deviated Wassel type III thumb polydactyly. After comprehensive assessments from preoperative radiographs, physical examinations and intraoperative reports, we corrected the metacarpophalangeal joint in 34 cases of radially deviated Wassel type III thumb polydactyly. Opening-wedge osteotomies combining bone graft and soft tissue reconstruction were used in 28 cases and soft tissue reconstruction only in six cases. Absorbable sutures were used instead of traditional Kirschner (K)-wires to fix the bone grafts. Patients were followed up for 12-78 months (mean 47 months). According to the Tada scoring system, 25 patients achieved good results, seven fair results and two poor results. Our modified technique for correcting radially deviated Wassel type III thumb polydactyly yielded satisfactory results. Continued follow-up and further studies will contribute to a better understanding of the long-term efficacy and potential refinements of this technique.