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Hyalgan, Synvisc and Supartz
("viscosupplementation")
are clear liquids purified from rooster combs. They increase the viscosity of joint fluid and the elasticity of the joint cartilage, and are also thought to have a weak NSAID (pain-relieving) effect. It only stays in the joint for about 48 hours, but the improvement can last for six to 12 months. It works best on mild to moderate arthritis. Repeat courses can be given every 6 to 12 months if it works well. FDA approval is only for use in the knee, but it can be used "off label" in the hip joint. A series of three to five injections are given into the joint. You cannot have these injections if you are allergic to eggs or feathers.
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