Osgood Schlatters Osgood Schlatters is a common cause of knee pain in active young people. A painful bony lump appears underneath the kneecap during and after exercise. This is due to the attachments of the quadriceps muscles at this point. It usually goes away with time. To book an assessment or for more information please email office@manchesterneurophysio.co.uk call 0161 883 0066 . ← Previous Effects of osgood schlatter Next → Error_log