What are the symptoms of osteonecrosis?

Condition analysis:
In the early stages of Osteonecrosis, people may not have any symptoms. As the disease progresses, however, most experience joint pain. At first, the pain occurs only when putting weight on the affected joint. Later, it occurs even when resting. Pain usually develops gradually, and may be mild or severe. If osteonecrosis progresses and the bone and surrounding joint surface collapse, pain may develop or increase dramatically. Pain may be severe enough to limit range of motion in the affected joint. In some cases, particularly those involving the hip, disabling osteoarthritis may develop. The period between the first symptoms and loss of joint function is different for each person, but it typically ranges from several months to more than a year.

Instructions:
Exercise and electrotherapy: Specific exercises to improve the range of motion in the hip joint and neuromuscular electrical stimulation will improve the condition. While performing exercise therapy it should be noted that reduced weight bearing in the affected joint can slow the damage caused by avascular necrosis and also permit natural healing.

Yoga: The slow and passive movements involved in the asana practice will improve the muscle strength around the joints involved. This indirectly supports to improve joint range of motion. As like exercise it is important to keeping weight off the sore-side hip while performing standing and sitting series of Asanas.