From a total of 153 patients (251 feet), 64 (41.8%) patients, who had had 105 modified Mitchell procedures, were clinically and radiographically examined with follow-up periods ranging from 15 to 24 years (mean, 21 years). Mean age at operation was 41 years (range, 12-64 years).
The classic double osteotomies, which diverged slightly toward the plantar surface and the distal fragment, shifted laterally, and angled plantarward, were fixed with a smooth Kirschner wire. In this way, it was possible to achieve a reduction in the first intermetatarsal angle from an average of 22.5° preoperatively to 7.7° postoperatively, and the hallux valgus angle changed from an average of 33° to 17°, with an average shortening of the first metatarsal of 5.4 mm and an average lateral displacement of the first metatarsal head of 4.5 mm.
In 67 feet (64%), the results were graded good to excellent; in 23 feet (22%), satisfied; and in 15 feet (14%), poor. The results were worse than the results obtained on the same patient population with a follow-up ranging from 2 to 11 years, with 97% good-to-excellent results reported. Pain over bunion caused by recurrence of the hallux valgus deformity was the main reason for this late deterioration of the results.