Knock knees, or genu valgum, is a condition where a person's knees touch while their ankles remain apart. This alignment can create a noticeable gap between the feet when standing straight. It is common in children and often resolves as they grow, but it can persist into adulthood in some cases. The condition can result from various factors, including genetics, nutritional deficiencies, or underlying health issues. While knock knees are usually not serious, they can sometimes lead to discomfort or joint problems. Treatment options may include physical therapy, braces, or, in severe cases, surgery.