The inflammation of the patellar tendon, also called patellar tendinitis, causes pain at the bottom of the kneecap (patella) - mostly on one leg. Patellar Tendonitis, also called Jumper's Knee, often occurs in runners.
The Tibial Stress Syndrome, also known as shin splint, is a painful sensation in the shins. The disease usually occurs after exercise. One reason may be overused muscles. Shin splint most likely occur in sports with quick direction changes, but also in untrained athletes e.g. after weight gain or after a change of footwear.