* Image borrowed  from  Maîtrise Orthopédique

Rarely used in daily practice the "Grinding test"  of G. Appley, is performed in a prone position  with the knee flexed. Compression in external rotation and internal rotation may be painful, showing that the medial or lateral meniscus are torn. The test is always checked by performing rotation without compression. This manoeuvre should not cause discomfort, unless the collateral ligaments are affected.