Grinding test

The grinding test is to check the sliding of the patella in the block. Used to diagnose patellofemoral syndrome. Abrasive tests are commonly used for collateral ligament damage or meniscus rupture, and can be positioned. Abnormal result: If the pain occurs, it is positive. The examiner held the affected limb's feet with both hands and flexed the affected knee by 90 °. The calf was in the upright position with the foot center, then squeezed the knee joint downward, and rotated outward and inward At the same time, the knee joint is flexed to the maximum, and then the lower limbs are straightened. If pain occurs, it is positive. The positive result of this test is mainly found in the collateral ligament injury or meniscus rupture, and can be located.