When calcium deposits form in a previously injured muscle, it is called myositis ossificans. Myositis means muscle inflammation. Ossificans means calcification or bone formation.
It usually occurs after an injury to a large muscle. The most common muscle involved is the thigh muscle (quadriceps). It can also occur in the upper arm (triceps) and other muscles. There is usually a blow to the muscle that causes a hematoma (a deep bruise with bleeding). For example, a soccer player may be kicked in the thigh or a football player may be hit in the triceps by a helmet. Over time as the deep bruise heals, calcium deposits may form in the muscle tissue. This may happen over several months. No one really knows why this occurs. Usually larger hematomas increase the risk.
When a person has a muscle hematoma it may takes weeks or months for the swelling to completely go away. If you develop calcium deposits, the area will feel firm or full. Sometimes it is painful, but most times it is not. You may have decreased range of motion.
Your provider will take a history and examine you. An X-ray will be done to show the calcium deposits within the muscle. Sometimes you will have an MRI.
Usually calcium deposits in the muscle does not need treatment. Sometimes large areas of calcium deposits in the muscles are treated with surgery.
Sometimes calcium deposits in the muscles can resolve but often the calcium deposits are permanent. In most cases muscle strength and range of motion return to normal within a few months to a year.
It is important to take care of the initial hematoma:
Unless the calcium deposits in your muscles reduces your strength or range of motion you can usually continue your sport or activity. Talk with your healthcare provider about when you can return to your sports and activity.
Most hematomas are caused by direct blows that cannot be prevented. However, be sure to use the proper protective equipment during sports.
