الفهرس 
Introduction
Imaging modalities of knee OAOnly 14 pages are availabe for public view
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Abstract
Knee osteoarthritis (OA) is a chronic joint disease affecting one-third of elderly people. Nevertheless, joint injury also contributes to acute and longterm cartilage degradation in the younger population(1). The knee joint is one of the regions of the body that is most commonly prone to injury during sports and everyday activities, joint injuries frequently lead to cartilage degeneration, which ultimately results in OA(2). The disease limits daily activities such as walking, stair-climbing and housekeeping, leading to a lack of functional independence and impairment of quality of life(1). Osteoarthritis is a multifactorial, slowly progressive degenerative disorder of the joints leading to irreversible damage of the cartilage, sclerosis of subchondral bone and synovial inflammation, as a consequence of increasing longevity and obesity, the cost of OA to the health care system rapidly grows(3). Osteoarthritis is the most common joint disorder resulting in significant functional impairment, the traditional imaging tool for OA is plain radiography, with joint space narrowing offering an indirect measure of cartilage loss and meniscal tears. However, Magnetic resonance imaging (MRI) is now widely used for the evaluation of osteoarthritis because it allows the visualization of intra-articular pathologies that are not evident on plain radiography(4).