Osteoarthritis is a joint disease that mostly affects the cartilage. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over one another. It also absorbs energy from the shock of physical movement. In osteoarthritis, the surface layer of cartilage breaks down, wears away and requires treatment. This allows bones under the cartilage to rub together, causing pain, swelling, and loss of motion of the joint. Over time, the joint may lose its normal shape. This may be due to single event trauma (such as a football injury), or may be due to a lifetime of inefficient biomechanics. Promoting correct alignment will minimize the ageing of joints. Orthotics, Pilates, yoga and regular manual therapy to promote efficient posture is highly recommended as osteoarthritis treatment.