According to the MRI done on my spine, it is noticed the L4 vertebrae has shifted outwards resulting in the immediate upper and lower vertebrae collapsing towards each other pressing on the transverse nerves which result in the calves and back of the thighs becoming caught and painful. With the result walking and standing is very difficult and painful. There is no pain in the lower or upper back. Sitting is comfortable and I can drive my car without any discomfort or pain.