Genu valgum, commonly known as "knock-knees," is a condition where a person's knees angle inward and touch each other when standing straight. This alignment can cause the lower legs to bow outward, creating a noticeable gap between the ankles. It is often seen in children and may resolve as they grow, but in some cases, it can persist into adulthood. The condition can result from various factors, including genetics, nutritional deficiencies, or underlying health issues. While genu valgum is usually not serious, it can lead to discomfort or joint problems over time. Treatment options may include physical therapy, braces, or surgery in severe cases.