Patient Portal; Pay Your Bill (630) 462-4963. Mark A. Gapinski, MD. MENU. About. Overview; ... Osgood-Schlatter disease (also called Schlatter's disease or osteochondrosis of the tibial tubercle) is inflammation in the top of the shinbone (tibia) where the patellar tendon attaches to a bony mound in the knee called the tibial tubercle ....