Although there are several conditions which may lead to the need for knee replacement, arthritis (whether it be osteoarthritis, rheumatoid arthritis or traumatic arthritis) is the most common reason. A number of other factors contribute to joint disease including genetics, developmental abnormalities, repetitive injuries and obesity.
According to the National Osteoporosis Foundation, the best exercises for building and maintaining bone density are: 1  Weight-bearing exercise, such as walking, that makes you work against gravity while staying upright.hese studies show that people with higher levels of vitamin D have... Although people with osteoporosis may believe that exercise increases the risk of injury from broken bones, the truth is quite the opposite.
While people with osteoporosis are encouraged to exercise more, I wonder whether they are also cautioned about these difficulties. I have osteopenia -- and I do believe I get leg fatigue more frequently than necessary, so that when I go for a moderate walk I have to find a bench to sit upon occasionally along the way.