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Don't worry, your not going with it for the rest of your life. Usually after the surgery there is stretch of the muscle fibers and tissue which causes stiffness
therefore mostly patients with such surgeries are advised for frequent physiotherapy
sessions which I hope you haven't gone for it. The numbness
sensations are due to nerve
which is also facing compression from the stiffness.
It is recommended to visit a physiotherapist and have some physio sessions as advised by him which will release and stiffness and hence the symptoms. use vitamin B complex supplements as they are very much necessary for nerves health.