Impact of Impairment on Activities: Skeletal Function- s.770, d.410, B.7710 People with OI have weak and brittle bones that can break easily, even with little or no injury. Frequent fractures and poor bone growth can lead to bone deformities and short stature. This can affect how they move, grow, and do everyday tasks, often requiring additional support or adjustments. Connective Tissue Function- s.770 People with OI often have underactive Type I collagen, a key protein in bones, skin, and tendons. This weakens the body's support structures, leading to fragile bones, loose joints, and stretchy skin, which can make any form of physical activities harder and increase the risk of injury. Muscle Strength- s.770, d.430, B.730 People with OI may have muscle weakness, often caused by reduced physical activity or problems with connective tissues. This can make it harder to do tasks that need strength or endurance, such as walking, lifting, and additional activities of daily living. ICF Browser (who.int) (Johns Hopkins Medicine, n.d.)