Knock knees and weight loss: what to know

Knock knees, or genu valgum, mean the knees angle inward relative to the hips and ankles. Alignment is influenced by growth, bone shape, joint position, muscle control, and sometimes an underlying bone or metabolic problem. Extra load can make walking, stairs, or running feel harder, yet body weight is not a complete explanation for inward knee alignment. In children, growth stage matters greatly; in adults, long-standing alignment may remain even after body weight changes.

If weight change is a goal, use a gradual, supportive plan rather than strict restriction, especially for a child or teenager. Choose low-impact activities such as swimming, cycling, or comfortable walking, and stop if pain changes your gait. Physiotherapy can work on hip and leg strength, balance, and movement control; [Paediatric Physiotherapy](/treatments/physiotherapy-and-rehabilitation/paediatric-physiotherapy/) may be relevant for a growing child. If alignment causes persistent symptoms or limits activity, an orthopaedic review can discuss options such as [Osteotomy](/treatments/reconstructive-orthopedic-surgery/osteotomy/).

Book an assessment for knee pain that persists, swelling, repeated giving way, reduced walking distance, or difficulty with stairs. A child should be reviewed if the knees are markedly uneven, the change is worsening, or walking and play are affected. Seek urgent care after an injury when weight-bearing is not possible, swelling appears quickly, or the limb looks deformed.

Ask whether symptoms come from alignment, the kneecap, muscles, or another joint. Ask what activity is suitable now, whether a nutrition professional could help, and how growth or alignment will be followed over time.