Mueller Jumper's Knee Strap RED OSFM This adjustable strap is designed to improve patellar tracking and elevation by applying mild pressure on the tendon below the kneecap. The tubular insert provides uniform pressure to help reduce pain caused by running and jumping. This tubular brace applies mild pressure to the tendon below your knee cap, helping to improve mobility and providing pain relief from injuries, patellar tendonitis, Osgood-Schattler's disease and more.