Muscle contusions = damage to a muscle through a direct impact. An impact to a muscles can cause much more damage than you might expect. In most contusion cases the muscle is crushed against the bone. For example when somebody puches ore kicks you in the leg, or when you fall on a stone. If contusions are not treated correctly myositis ossificans can result. (myositis ossificans = when the bone forms with the muscle = NOT GOOD) So don't underestimate this type of injury. Muscle Contusions are very common in combat sports. Find more information about sport injuries at injuries main.