Seventy-five feet in forty-eight patients that had calcaneonavicular
coalition were evaluated at two to twenty-three years after resection of
the coalition and interposition of the extensor digitorum brevis muscle.
The result was excellent or good in fifty-eight feet (77 per cent). Three
feet that were rated initially as having a fair result improved over time,
and at the last follow-up the result in those feet was rated as good. Only
five feet (7 per cent) had a poor result. The best results were in patients
who had a cartilaginous coalition and who were less than sixteen years old
at the time of operation.