A 6 year-old male is brought into your office for evaluation of his gait. You note that when ambulatory, the medial aspects of his knees are far apart and his feet are unusually close together. Which of the following best describes this condition?
1) cubitus valgus
2) cubitus varus
3) genu valgus
4) genu varum
5) Legg-Calve-Perthes disease