Tibia valga is a condition in which the tibia bone in the lower leg slants outward at an abnormal angle, leading to knee and ankle problems. Common synonyms for tibia valga include bow-legs, knock-knees, and genu valgum. Other related medical terms include tibial torsion, which is a rotational deformity, and coxa valga, which is an abnormal angle of the hip joint. In some cases, tibia valga can also be referred to as infantile tibia vara, when it occurs in young children. It is important to diagnose and treat tibia valga early on to prevent long-term complications and discomfort.