Myositis ossificans comprises two syndromes characterized by heterotopic ossification (calcification) of muscle.
• Myositis ossificans comprises two syndromes characterized by heterotopic ossification (calcification) of muscle. In the first, and by far most common type, nonhereditary myositis ossificans (commonly referred to simply as “myositis ossificans”), calcifications occur at the site of injured muscle, most commonly in the arms or in the quadriceps of the thighs.
• The term myositis ossificans traumatica is sometimes used when the condition is due to trauma. It is passive stretching than active exercise, is responsible for bone formation.
• The second condition, myositis ossificans progressiva (also referred to as fibrodysplasia ossificans progressiva) is an inherited affliction, autosomal dominant pattern, in which the ossification can occur without injury, and typically grows in a predictable pattern.