An essential factor of physical inactivity is exercise behaviour. Fear of movement is an important aspect of knee OA. Disability is present due to the individual's fear of physical movements that would cause pain. Evidence links fear of movement with knee OA and the role of exercise in the management of knee OA. Patients with OA experience pain during activity, which leads to an expectation that further activity, will cause greater pain therefore increasing muscle weakness. It has been indicated that individuals could have negative attitudes and beliefs about their knee problems, which could cause a barrier to treatment, with socioeconomic, personality and environmental factors being as important as the physical characteristics. Other factors such as balance issues and laxity of the knee have been associated with activity limitations. However, in a systematic review found weak evidence to support pain, distress, and avoidance of activity in participants with knee OA. Understanding individual exercise behaviours and habits is essential to improve exercise adherence. Non-compliance is common within physiotherapy with patients unwilling to accommodate exercises within everyday life. Reasons for this may include type of exercises, dosage, and underlying beliefs from the clinicians towards exercise as well as external factors. Incorrect prescription of exercises can lead to increased pain, decreased function and decreased exercise adherence. This could cause fear of movement whilst completing exercise. It has been concluded that in OA there is limited evidence that interventions can improve exercise adherence. Therefore, an understanding of non-adherence and the effects of kinesiophobia is essential to further develop exercise programmes for patients with OA.