Different types of bow legs explained

In physiologic bow legs, the curve is part of normal early growth and is usually present on both sides. Persistent or worsening bowing may be developmental, related to the upper shin or lower thigh, or linked to conditions that affect bone strength and growth. Blount disease is one example of a growth-plate problem; rickets is another possible medical cause.

The appearance can be symmetrical or noticeably greater on one side. Clinicians consider the child’s age, walking pattern, pain, height and the angle of the legs. In adults, bowing may reflect an old injury, uneven wear in the knee or a longstanding alignment pattern.

Arrange an assessment if the curve is one-sided, painful, increasing, associated with limping or still prominent as a child grows. A clinician may observe walking, examine the hips, knees and ankles, and request standing X-rays when the alignment needs closer measurement. Do not use braces, supplements or exercises without advice, because the useful treatment depends on the cause and age.

Seek prompt care after an injury that causes sudden deformity, severe pain or inability to bear weight. Arrange timely review for bowing with poor growth, repeated falls, fatigue or bone pain. A child who develops a rapidly changing or clearly uneven curve should be assessed rather than monitored casually.

Ask whether the alignment fits the child’s stage of growth, whether both legs are affected equally and whether imaging or blood tests are needed. Discuss observation, paediatric physiotherapy and, when a fixed deformity affects function, whether an osteotomy is relevant.