Cho-Pat Dual Action Knee Strap The patented Cho-Pat Dual Action Knee Strap provides full mobility with the benefits of Dynamic Pain Diffusion – and extra dimension of relief from painful and weak knees. Its exclusive range of sizes ensure a better fit and maximum performance. The Cho-Pat Dual Action Knee Strap applies pressure upon the patellar tendon below the kneecap to stabilize and tighten up the kneecap mechanism, which improves patellar tracking and elevation and reduces patellar subluxation. It adds further strengthening to the kneecap mechanism by applying pressure on the tendon above the kneecap as well. This tends to reduce the forces of the quadriceps on the patella tendon and erosion of the undersurface of the kneecap due to a possible misalignment of the quadriceps (Q angle). The device's design and construction apply constant dynamic forces to the surrounding areas of the knee reducing the likelihood of overuse syndromes. At the same time, the strap allows for full mobility while providing maximum benefits. Above The knee Support: Reduces the force of quad muscles on the knee Lessens potential for misalignment Below The Knee Support: Improves tracking Reduces displacement Sizing Chart Click to enlarge.