Type I Osteogenesis Imperfecta is the most common and mildest type of this disease. While the structure of the collagen is normal, there is less collagen than there should be. There is little or no bone deformity, although the bones are fragile and easily broken. The effects of Osteogenesis Imperfecta may extend to the teeth, making them prone to cavities and cracking. The whites of the eyes may have a blue, purple, or gray tint.
Type I individuals have normal or slightly shorter stature with little or no bone deformity. There is less collagen than normal in individuals with type I and they have loose joints and low muscle tone. Many often have Blue Sclera, a condition in which the white of the eye has a blue, purple, or grayish tint. They have a triangular shaped face. Those who have type l also have the possibility of hearing loss.
People with Type I Osteogenesis Imperfecta average nearly 40 fractures before puberty; however, they experience only a few fractures after puberty. The collagen in Type I OI is normal, but the amount produced is less than normal.
Some features of Type I Osteogenesis Imperfectainclude:
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