I have a sore back i think sciatic nerve pinch. the front of me quad muscle is numb down to the knee are they related?

Possibly: There are several possible causes for numbness of the anterior thigh including a pinched nerve in the lumbar spine. Have it evaluated.

Meralgia paresthetic: Pain in the anterior & lateral (front & side) of the thigh is more often a pinched lateral cutaneous femoral nerve, rather than sciatic nerve. In any case, physical therapy can likely help both problems, but it's important to see your neurologist to get a diagnosis first. Good luck!