As people cross the age of 60, stiffness of the knees and hips usually crops in causing difficulty in walking and easy movements of the legs.
Osteoarthritis is a degenerative condition of the weight bearing joints of the body. It is an unavoidable condition associated with aging. Knees along with hips bear the total weight of the body, right since a man starts walking. The underlying cause for osteoarthritis is reduced lubrication of the joint, due to reduction in the quantity of lubricating liquid of the joint. This makes the joint stiff. Small new bones called osteophytes start forming on the surface of the joint space. These hamper free movement of the joint causing pain and stiffness.
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