Thank you for your help on this..
I am a 50 year old women, relatively healthy. Yesterday, I was unable to stand on my left leg without excruciating pain. My left thigh above my knee is tremling out of control. However, when I sit and bend forward the pain appears to subside a bit. However, the thigh spascms continue. A few weeks pack injured lower back at a Hot Yoga class. Left left was affected, however, not severely as it is now. The lower back pain is somewhat still there. However, the pain that is unbearable is the spasms in my left thigh above the knee. Difficult to stand on leg, apply pressure on the leg.
I have been practicing the hot yoga for almost 14 year regularly. Never ill. However, poor diet.