Walking and low-impact exercise generally do not worsen knee osteoarthritis and are actively recommended as part of non-surgical management. Staying active helps maintain muscle strength around the knee, which reduces the load on the joint surface and supports overall function. Complete rest, by contrast, weakens the supporting muscles and tends to worsen stiffness and pain over time.
The type and intensity of exercise matters. Low-impact activities — walking, swimming, cycling, and water-based exercise — are generally well-tolerated and beneficial. High-impact activities such as running, jumping, or squatting with significant load may aggravate symptoms in moderate to advanced osteoarthritis and should be modified. A physiotherapist can help design an appropriate exercise programme tailored to the stage of arthritis, the patient's fitness, and their specific limitations. Patients should not interpret pain during exercise as a signal that they are worsening the joint — some discomfort during activity is expected, though sharp or severe pain should always be reviewed.
