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What is Myositis Ossificans?

Our Pediatric Sports Medicine team put together these videos to provide information for you.
Carlos R. Rodriguez, MD

Mysositis ossificans is a condition in which bone forms in a muscle bruised by injury. Myositis means inflammation of muscle and ossificans means bone formation. This typically occurs in the arm or thigh muscles after a significant bruise or contusion. It can develop in 10-20% of thigh contusions.

A contusion to the arm or thigh causes the muscle to be crushed against the bone which causes bleeding in the muscle. A blood clot or hematoma forms within the muscle and it may then become bone. It most commonly occurs in young adults and teenage males.

Symptoms usually include pain, tenderness, swelling and warmth over the injured area. You may also feel a lump or mass inside the muscle. You may also experience pain in the muscle when you try to move the leg or arm involved.

Our physicians at the All Children's Sports Medicine clinic will ask about your symptoms, examine the area affected and perform an ultrasound. X-rays may also be performed to asses for any other problems.

Treatment usually involves icing, compression bandaging and stretching the area. You may also be prescribed an anti-inflammatory medication. Physical therapy and ultrasound are also prescribed to help break down and prevent the bone formation. Rarely aspiration (removal with a needle and syringe) of the clot may be recommended. Most patients recover in 3-6 months and surgery is rarely required.

Our goal is to get you back to your sport as safely and quickly as possible. In general, the longer you have symptoms before you start treatment, the longer it will take to get better.

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AllSports Medicine is a program under All Children's Hospital. All Children's Hospital is the only specialty licensed children's hospital on Florida's west coast. Founded in 1926, All Children's has grown into a leading pediatric referral center that is dedicated to advancing treatment, education, research and advocacy in child health.

All Children's Hospital is a member of Johns Hopkins Medicine.
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