A consecutive sample of knee osteoarthritis patients with moderate/severe knee pain will be recruited. Potentially eligible participants will be identified at musculoskeletal assessment clinics and from physiotherapy outpatient waiting lists. A feasible recruitment rate is estimated at 12 patients per month with recruitment continuing until the specified numbers are achieved. Those who agree to participate will attend for a baseline assessment prior to commencing physiotherapy treatment. Written informed consent will be obtained before enrolment in the study.