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.
Repeat each exercise a few times, then increase the number of repetitions as the exercise gets easier. If you've ever hurt your back or have other health conditions, such as osteoporosis, consult your doctor before doing these exercises. 1  Back exercises in 15 minutes a day. 2  Knee-to-chest stretch. 3  Lower back rotational stretch.  Lower back flexibility 1  exercise. Bridge exercise.  Cat 1  stretch. Seated lower back rotational stretch.  Shoulder blade squeeze.