Genu valgum is a medical term that refers to a physical deformity where the knees lean inward and the lower legs angle outward. There are several synonyms used to describe genu valgum. Some of the common synonyms include knock-kneed, knee valgus, and valgus knee. While genu valgum can be mild, there are cases where it can cause pain and discomfort. Treatment options include exercises to strengthen the muscles supporting the knee, surgery, and in severe cases, the use of braces or orthotics. If left untreated, genu valgum can lead to complications such as arthritis, knee instability, and gait problems.