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" ... Patellar tendinitis is defined as inflammation of the patellar tendon, which is a thick, organized band of tissue that attaches the kneecap (patella) to the shinbone (tibia). It plays an important role in transmitting force from the quads to the tibia so the leg can be straightened and support our weight. The explosive movements involved in tennis can cause micro-tears and degeneration in the tendon because of repetitive strain and overuse. ... "