Did you know? Fibrodysplasia ossificans progressiva : Stone
Fibrodysplasia ossificans progressiva (FOP) is a disorder that causes muscle tissue and connective tissue such as tendons to be replaced by bone that forms outside the skeleton.

The ACVR1 gene found in bone, muscles, tendons, and ligaments regulates growth and development of those tissues and is normally responsible for turning cartilage into bone as children develop. However, mutations of this gene can allow ossification to go unchecked throughout a sufferer's life, even turning skeletal muscle into the bone and causing joints to fuse together.swelling and inflammation, followed by ossification - the formation of bone.

People with the condition are often born with malformed big toes, short thumbs or other skeletal abnormalities. There are no known effective treatments for FOP. Some drugs have been used to reduce pain and swelling. Occupational therapy treatments like special shoes and braces can help manage the symptoms. Biopsies and invasive tests are not recommended due to the trauma they cause muscles. The process generally becomes noticeable in childhood, usually starting in the neck and shoulders and proceeding down the body. Extra-skeletal bone formation causes a progressive loss of mobility as the joints become affected.

Any trauma to muscles, like a fall or medical procedure, may trigger episodes of muscle

This disorder occurs in about 1 in 2 million people and since Trauma exacerbates the condition, so attempts to remove bone surgically just results in the body producing even more bone in the area.

Source: https://www.thesun.co.uk/news/9045429/boy-real-life-statue-fibrodysplasia-ossificans-progressiva-stone-man-syndrome/
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