Myositis ossificans is due to the rupture of the capillaries in muscle which later develop in the form of calcium deposition over the muscle. Its common especially after an elbow # . X ray reveals a cotton wool like appeareace. The most common muscle to get affected is the Quadriceps. Never do any massage or tissue mobilisation in elbow. My suggestion is that, make the patient to do more active movmnts within the availiable ROM.