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Patellar tendinitis is usually an injury which affects the tendon linking your kneecap (patella) to your shinbone. The patellar tendon performs a crucial function in the way you use your legs. It helps your muscles extend your lower leg to be able to kick a ball, push the pedals on your bicycle and jump up in the air. Patellar tendinitis is most common in active people whose sports involve regular leaping, for example, basketball, soccer and volleyball players. For this reason, patellar tendinitis is commonly known as jumper's knee. However,...