@ankara--Osteoporosis is when bones become less dense. The word itself means "bones with pores." I don't think it has a direct affect on anything else but osteoporosis can affect other organs in the skeletal system, especially when bones break. It also affects blood vessels and vitamin and mineral levels in the body.
People tend to think of bones as hard solid organs, but they also have layers within them. Bones have vessels and bone marrow and several different textured layers. I think bones become the most important organ in the skeletal system as we get older. Joints often cause problems too, but osteoporosis in bones is more prevalent after a certain age.