Knocked knees and running: what to know

Knocked knees describe inward knee alignment, often called genu valgum. During running, the knee may move inward as the foot lands and the leg accepts load. This can reflect bone alignment, hip and trunk control, foot motion, fatigue, or a combination of factors. The appearance alone does not show how well you can run. Symptoms such as pain around the kneecap, repeated strains, or a sense of giving way are more useful in deciding whether help is needed.

Reduce speed, distance, hills, or frequency temporarily if symptoms rise, and use cycling or swimming to maintain fitness while the knee settles. Warm up, build training gradually, and include strength work for the hips, thighs, and calves under guidance. A physiotherapist can watch your running, check balance and joint control, and suggest technique changes; [Paediatric Physiotherapy](/treatments/physiotherapy-and-rehabilitation/paediatric-physiotherapy/) is an option for a younger runner. Persistent structural problems may warrant orthopaedic discussion, including [Osteotomy](/treatments/reconstructive-orthopedic-surgery/osteotomy/).

Arrange review when pain returns with each run, swelling follows activity, the knee locks, or the leg repeatedly gives way. A child or teenager should be assessed when running becomes difficult, alignment is worsening, or one side differs clearly from the other. Seek urgent care after a twist or fall if weight-bearing is impossible, the knee rapidly swells, or there is obvious deformity.

Ask which running loads are suitable now, whether your pain is coming from the kneecap or another structure, and which exercises match your movement pattern. Ask how a return to running should be staged and what symptoms mean you should stop.