Injections for joint and soft tissue disorders: when and how to use them.

Joint and soft tissue injections may be the only way to differentiate various arthritic disorders, accurately identify a septic joint, and apply focused treatment. Certain considerations can make these injections safer and more effective. This article reviews the principles of diagnostic and therapeutic use of joint and soft tissue injections and makes specific recommendations for common injection sites. Also described are appropriate aseptic techniques for aspirating and injecting joints, bursae, and soft tissue, as well as the judicious use of corticosteroid injections in this age group.