Well when you suffer sciatica you just don't work flexibility as when you are healthy. You shall first work on your pelvis position to make sure the nerve is not irritated by any piece of backbone moving around. Then back and hips fixed you work on your leg positions, the moves are usually very short.
There are two kinds of nerve symptoms whether it touches the sensitive nerve or the motor one. Seems in your case the tibial or common peroneal roots are affected. If the sensitive is affected then your sensitivity when you touch your ankle with something else than yourself is altered, it can be diminished, stronger, cause burn sensations or whatever. If the motor nerve is affected then you'll lack strength so that walking on your heels will be difficult not because of the pain it provokes or you'll have trouble getting your toes up when standing on your feet. A loss of strength may provoke liquid infiltration trough the tissues and so your ankle could "puff up".
Do you as well suffer lower back pain? Are the muscles of the lumbar region contractured?
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