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Osteoarthritis is a joint disease that mostly affects cartilage. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage allows bones to glide over each other. It also helps absorb shock of movement.
Bones that are affected by osteoporosis can break (fracture) with relatively minor injury that normally would not cause a bone to fracture. The fracture can be either in the form of cracking (as in a hip fracture) or collapsing (as in a compression fracture of the vertebrae of the spine).steoporosis facts. 1  Osteoporosis is a condition of fragile bone with an increased susceptibility to fracture. 2  Osteoporosis weakens bone and increases risk of bones breaking. 3  Bone mass (bone density) decreases after 35 years of age, and bone loss occurs more rapidly in women after menopause.