External epiphysiolysis with valgus slip of the femoral epiphysis is rare. The authors report two such chronic cases, one unilateral and the other bilateral. This disorder complicates a coxa valga with a reversed cephalic growth plate, downward and externally. This coxa valga which appears constitutional is sometimes associated with an increase in femoral antetorsion. Treatment is the same as classical varus slip of the femoral epiphysis.