Eighty-eight patients with either physiological genu varum or genu valgum have been followed at the Florida Crippled Children's Clinic at Variety Children's Hospital. A critical assessment was conducted clinically and radiographically to evaluate their course. Approximately 32.5% of the patients seen with genu varum were found to undergo a transition to genu valgum. In this group, there were both treated and untreated patients. The peak incidence of genu varum was found to be between 1 and 2 years of age, while that of genu valgum was found to be between the ages of 3 and 4 years.
Leonard A. Greenberg, Aubrey A. Swartz. Genu Varum and Genu ValgumAnother Look. Am J Dis Child. 1971;121(3):219–221. doi:10.1001/archpedi.1971.02100140085006