Abstract
1. A clinical and radiological survey has been made of the families of thirty-one patients with peroneal spastic flat foot and tarsal coalition (twenty-seven calcaneo-navicular, four talo-calcaneal).
2. Thirty-nine per cent of ninety-eight first degree relatives were found to have some type of tarsal coalition.
3. A surprise finding was that not one of the first degree relatives had ever had symptoms referred to the tarsus.
4. No case of "ball and socket" ankle joint or of carpal coalition was found in this series.
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