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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.
Osteoporosis is a condition that affects your bones. It occurs when you lose too much bone or donât make enough new bone to replace the bone that you normally lose. When this happens, your bones become less dense. People with osteoporosis have low bone density.People that donât have osteoporosis have normal bone density. There is also a condition called osteopenia, where your bone density is lower than normal, but not quite low enough to be considered osteoporosis.eople with osteoporosis have low bone density. People that donât have osteoporosis have normal bone density. There is also a condition called osteopenia, where your bone density is lower than normal, but not quite low enough to be considered osteoporosis.