Genu Varum (Bowlegs) and Genu Valgum (Knock-Knees) By Simeon A Boyadjiev Boyd, MD, University of California, Davis Reviewed / Revised Sep 2022 View Patient Education Topic Resources Genu Varum (Bowlegs) Genu Valgum (Knock-Knees) The 2 major types of knee or femoral-tibial angular deformities are genu varum (bowlegs) and genu valgum (knock-knees).