The occurrence of congenital clubfoot in members of twins is very rare. The opposite opinion seems to have existed that clubfoot deformity was likely to occur in multiple gestations, since there was less space within the uterine cavity and consequently the developing fetuses were crowded together, thus predisposing to developmental variations. This theory seemed to be generally accepted for many years; but, like many other hypotheses, it has been found to be incorrect. Statistics show that congenital talipes occurs less frequently in multiple than in single gestations. In fact, only four bilateral cases could be found after a thorough search of the literature. In these cases, reported by Rugh,1 Ehrenfried,2 Ely3 and Owen,4 there was bilateral clubfoot. No reference was found relative to the unilateral deformity in both members of twins.
In May, 1921, Bernice and Charlotte G., twin girls, aged 20 months, were brought to
Berkheiser EJ. UNILATERAL SYMMETRICAL CONGENITAL TALIPES IN TWINS. JAMA. 1926;87(16):1300-1301. doi:10.1001/jama.1926.92680160003013d