I am a 42 yr old female. I have been bothered by vibrations in my left thigh in my quad for months now. I have spondylolesthesis L5 S1 and some sciatic pain down back of left thigh. I get a great workout playing tennis 3 or 4 days a week. I have also been bothered by calf injuries in my left calf for the past year. I have to wonder that this is all tied together. I have a stress test in two weeks I will ask cardiologist and hope he doesn't think I am crazy.