Spinal stenosis is a disorder in which the spinal canal narrows, thus putting pressure on the spinal cord and the spinal nerves. The condition is most often caused by the aging degeneration process in the vertebrae and is most common in older people. Disc herniation might also cause it. The symptoms related to this condition originate from the nerves and might include: pain in the lower back or buttocks, and in more severe cases, numbness and paresthesia (abnormal sensations).
As for the muscle atrophy correlation with the spinal stenosis, the following can be stated: the nerves responsible for the muscles might also be affected, which would result in muscle weakness and decreased endurance. This might initiate avoidance of movement which might, after a long period, result in muscle tissue wasting away.
Please note that the muscle itself is not affected by the disorder and can stay in good shape with adequate exercises or physical therapy. You might want to visit an orthopedist and consult whether the muscle wasting you noticed might be caused by the spinal stenosis.
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