Basketball players may develop patellar tendonitis.Patellar tendonitis is also called “jumper’s knee.”  It can develop in athletes who jump again and again, like in basketball or volleyball. It is also common in runners. The patellar tendon is a thick band of connective tissue that connects the knee cap to the shin bone. Its job is to straighten the knee.  It can become irritated and inflamed when used too much or not in the right way. This causes pain on the surface of the knee.