Osgood–Schlatter: ...also known as apophysitis of the tibial tubercle, or Lannelongue's disease, is an inflammation of the patellar ligament at the tibial tuberosity. It is characterized by a painful lump just below the knee and is most often seen in young adolescents. Ref: https://en.wikipedia.org/wiki/Osgood%E2%80%93Schlatter_disease
Answered 4/10/2016
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