hi I would suggest reassessment by a spine doctor,for position of cord compression, whether improving or some fresh compression- an x ray or MRI may be needed. If tetraplegia is of several years duration, depending on your age, one may like to rule out ostearthritic changes as fresh osteophytes may also cause some pressure at nerve foramina, also MRI may reveal soft tissue swelling or oedema if developing and need some decompression with additional medicines If tetraplegia is recent , (less than a year) there are chances of healing taking place gradually and sensations, functions may improve over a course of few months. recoveries are possible even upto 2 years since. So physical therapy, and TENS stimulation of muscles of all limbs, maintainence against contractures and muscle wasting should continue with passive movements by a physotherapist Best wishes Regards