I hear a bone cracking sound in my right leg whenever I try to dress myself and I m trying to get my leg into the pants. I have had a pain in that leg on and off for about 9 months. Two surgeons said it was arthritis but neither got to explain the cracking sounds. I m 90 and walk about a mile every two to three days. Otherwise I live privately and still drive as well as basic household chores and cooking. Thank you.