Traumatic quadriplegia : whiplash injury

My father, Karuppanan 56 years old, 13 years back when he sustained an injury after a banana tree fall on his head. Had traumatic quadriplegia Whiplash injury on December 2007. He undergone several treatments in different hospitals and he even undergone spine surgery last year (2019 Nov) - C6-C6 : Laminectomy and L4 Laminectomy and bilateral L4-L5 root decompression. Even after the surgery, the patient is still feeling heaviness on his back chest / numbness and stiffness of both upper and lower limb. He was able to walk with the help of Walker. But couldn't walk/sit continuously for more than 10-15 minutes as he is getting heaviness and hip pain. I can send all the medical records. Looking for a treatment and cure for the problem of my father.