Thank you for answering my question.
Hello dear and welcome to the medhelp forum. Lumbar spinal stenosis may cause numbness, weakness or cramping in thighs, legs and feet, shooting pain, and paralysis of legs in severe cases. Muscle loss or wasting results from sedentary way of living, secondary to disuse due to rheumatoid arthritis, or osteoarthritis if you are suffering. Other causes of atrophied muscles include neuromuscular disorders like guilain barre syndrome, secondary to diabetic neuropathy, malnutrition or stroke. You need to consult a neurologist since this could be a neurological disease apart from the considerable lumbar canal stenosis that you have. Wishing you all the best.