Medical Definition of apophysitis
: painful inflammation of a bony outgrowth and especially the area of active growth at the end of bone (as of the heel or shin) where a muscle or tendon attaches <calcaneal apophysitis> <Little League elbow is known medically as medial apophysitis …—The Lexington (Kentucky) Herald Leader, 20 June 2006> <… he probably has an inflammation of the growth plate along the rim of the pelvis. … This is called a hip flexor apophysitis and actually occurs frequently in young runners.—Doug Cutter, The Richmond (Virginia) Times Dispatch, 22 Jan. 1999>
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