INTRODUCTION
The knee is one of the most commonly affected joint in (osteoarthritis) OA, as it is exposed to high stress and use of the joint. Around 250 million people are affected by knee OA (KOA) worldwide.(1,2)
KOA affects patient's physical function, dynamic balance and stability.(3,4)
Several factors believed to have a role in affecting balance in patients with KOA such as muscle weakness, knee pain, decreased proprioception, limitation of joint range of motion and knee joint laxity.(3)
Physical exercise is the most recommended conservative treatment for patients with KOA.(4) In patients with mild to moderate KOA, pain, physical function and dynamic balance have shown significant improvement after fulfilling an exercise program.(5)
There is lack of data regarding the effect of combined strengthening and balance exercise on patients with different severity grades of KOA. Previous studies either assessed a specific severity grade of KOA or assessed KOA patients regardless of their radiographic severity.