I am a fit 64 year old - up until relatively recently running 8-10k 3 times a week. when talking to neurologist over the phone in November I reported excellent health except for slight feel of wobble in my left leg. Since then I've started to feel left hip pain which I did exercises for which cleared it up; and now left knee pain which I'm finding less responsive to exercise - physio suggests it may be need for PD med review; osteoarthritis; weak muscle around the knee; weak tendon. does anyone have anything similar?