Whenever I start walking for excercise or  other excercis, yoga, sit up etc, pain starts in the left backside of hip radiating subsequently to entire left leg joints resulting in knee pain, foot joint pain. A sound can be heard on folding the knees and Ihave to  stop excercise altogether and pain continues for days. Otherwise no pain but difficulty in climbing stairs. Only in left leg. Entire left leg from behind buttox.