medical injectionsLarge and small joint injectionsjoint injection (intra-articular injection) is a procedure used in the treatment of inflammatory joint conditions, such as rheumatoid arthritispsoriatic arthritisgouttendinitisbursitisCarpal Tunnel Syndrome,[1] and occasionally osteoarthritis.[2][3] A hypodermic needle is injected into the affected joint where it delivers a dose of any one of many anti-inflammatory agents, the most common of which are corticosteroidsHyaluronic acid, because of its high viscosity, is sometimes used to replace bursa fluids.[3] The technique may be used to also withdraw excess fluid from the joint.[2]