Abstract
A clinical study of 11 adult patients with symptomatic “rigid” flatfoot is reported on. Of the patients, 10 were females and one of them was a bilateral case. The age of the patients ranged from 48 to 80 with a mean of 60.6. Every patient had symptoms of pain and swelling at the attachment of the tibialis posterior tendon and was unable to invert the affected foot because of peroneal spasms. Yokokura's arch index in these cases was decreased about 30 percent on an average compared with the standard value. No tarsal coalition was seen in any case radiologically, but the accessory navicular bone was seen in 7 feet of 6 patients. In every case the deformity was not flexible, so attempts at manual reduction had ended in failure. Then triple arthrodesis was per-formed on 5 patients, and all the results were satisfactory.
