"Pins and needles" is a nerve sensation or can be a sign of circulation problems. Did the sensation travel from just above the inner knee/thigh across the quad then down the side of your leg? Fairly superficially as opposed to 'bone-deep'? You may have been experiencing a spasm where the sartorious and tensor fasciae latae come together at the front of the hip which can cause pressure on the nerves in that area. Do you get massage therapy? You may want to start getting some. It helps a LOT with spasm related problems. I have fibromyalgia and I've found since I started getting massage my 'charlie-horse' problem has gone away, as well as a lot of 'mysterious' other pains. In fact, my fibromyalgia has improved so much, I now hesitate to say I still have it--or that it has gone into 'remission'. (Not completely gone, but no longer a major factor in my life).