apophysitis /əpof′əsī″tis/ , an inflammation of an outgrowth, projection, or swelling, especially a bony outgrowth that is still attached to the rest of the bone. Apophysitis occurs due to excessive traction or stress most frequently affecting the calcaneus (Sever’s disease), the knee (Osgood-Schlatter), the shoulder (Little Leaguer shoulder), or elbow (Little Leaguer elbow).
