Medial collateral ligament bursitis in a 12-year-old girl.

A 12-year-old female athlete, training for an international career in pentathlon, was referred to our clinic because of 2 years of recurrent localized swelling and activity-related pain in the medial aspect of her right knee, since falling from a horse and hitting her knees on the ground. She had been examined by a number of doctors over this period and treated with physiotherapy without a proper diagnosis and with no improvement. She could run only very limited distances before excruciating pain and swelling, and she had to abandon participation in competitions.