Patellar tendonitis (tendinitis) is an acute injury to the patella tendon. Although the term patella tendonitis is at times used to substitute patella tendinopathy (jumper’s knee), they are two different terms. While patellar tendinitis refers to an acute injury to the patella tendon, patella tendinopathy is an overuse injury that affects the knee. Patella tendonitis is more about inflammation of the tendons while tendinopathy is more about degenerative issues in the patella tendon. Patella tendonitis results to a sharp pain at the front of the knee mainly at the lower side of the kneecap.