Patellar tendonitis is inflammation of the tendon that connects the kneecap to the tibia. The tendon is located in the front of the knee, just below the kneecap, and intervenes in the movements of knee extension. This tendon can become inflamed and cause pain when doing certain activities involving overexertion and repetitive minor trauma. The main symptom of this type of tendonitis of the knee is pain that increases when forcing the tendon (usually with running, jumping or climbing stairs), and in the most severe cases, can hurt even when walking. The treatment of patellar tendinitis includes resting, taking anti-inflammatories, the local application of cold and rehabilitation exercises for the quadriceps muscles. If the above measures do not give good results, it may be required to carry out infiltrations and in some cases, surgery.