A jumper's knee has a nagging or stabbing pain on the front of the knee, just below the kneecap. Jumping sports such as volleyball, basketball and skiing cause the most pain complaints. The more intensively the knee is loaded, the greater the pain. In severe cases, pain complaints are also present in daily life. The pain symptoms develop slowly and increase over time. If the pain is not heeded, a jumper's knee can develop into a chronic complaint. Sometimes fluid builds up around the affected area in the knee.