Patellar tendinopathy or jumper's knee is the name for an overuse injury characterized by pathological changes and sharp pain that occur on the distal part of the extensor mechanism of the knee, more precisely on the patellar tendon and its origin on the apex of the patella or its insertion to the tibial tuberosity. In the beginning stages of jumper's knee, the patellar tendon thickens and the inflammatory response begins. If the condition is not treated on time, microruptures and degenerative changes occur. Functional disability is correlated to pain intensity and can range from a slight incapacity to perform tasks to complete inability to participate in sports and everyday activities. Patellar tendinopathy is primarily diagnosed by pain from palpation on the apex of the patella or on the tibial tuberosity. Usually no associated ligamentary or meniscal lesions are present. For a more precise diagnosis, sonography is mostly used due to its low cost and general availability. While analizing the incidence rate of patellar tendinopathy and its prevention measures, it is crucial to know about risk factors that increase the likelihood of developing the condition. Some of the risk factors include anatomical malalignments of the lower extremity, musculotendinous imbalances in flexibility and strength of the thigh muscles, training on hard surfaces and inadequate sports shoes. Treatment of overuse injuries is mostly conservative. Rehabilitation of patellar tendinopathy usually includes eccentric exercises, in which the muscle fibers lengthen and are the best way to load the tendon in a controlled environment. Other therapeutic procedures include cryotherapy and thermotherapy, depending on the stage of the condition, to reduce the inflammatory response or stimulate the healing process of the tendon respectively. People typically ask for medical assistance too late, when the pain already impedes with their sports or professional activities. In that case, treatment is hindered and is consisting mostly of either a short or long term break, or a significant reduction in intensity regarding sports and professional activities. If after a longer time period no improvements or reduction in pain level occur, the patient will undergo a surgical procedure, which in overuse injuries and therefore also in patellar tendinopathy should always be the used as the last resort. However, without a good postoperative rehabilitation, surgery will not give satisfactory results.