Research to "fix" spinal cord injury in humans, has been insanely hyped, rare in reality, and very disappointing in its clinical applicability to human patients.
After a parade of rat models, mouse models, cat models, dog models, African green monkey models, pig models, guinea pig models, hamster models, rabbit models, gerbil models, etc. one wonders whether most researchers or funders will ever have any interest in benefitting human patients.
Rarely, one hears of somebody getting FDA approval for human research on the safety (not effectiveness) of an approach, and one never hears about the results. The test is typically on one patient in China.