Did he bruise the spinal cord? Does he have paralysis? Has he had an MRI to find out the type of spinal cord injury he has? The sooner treatment is implemented, the better. The location of his injury will determine his prognosis and his mental health is a huge part of getting him to feel better. Often, patients suffer from depression, so emotional support is key.
Physical therapy is very important and sometimes steroid injections to reduce inflammation. Stem cells are used in Europe and some clinics are involved in the US, but this treatment is still being studied. These cells have the ability to regenerate damaged tissue. I would have the family look into this treatment. There are a number of sports medicine clinics doing this treatment. However, in the US, it is not covered through insurance. Other forms of treatment are spinal laser therapy and shock wave therapy. It is a long haul unfortunately, and getting his team of doctors to ascertain the best treatment plan is very important.