Neurological status improved at Frankel grade from B to C in 2 patients,from B to D in 1 patient,from C to D in 5 patients,from C to E in 2 patients,from D to E in 9 patients.

• B级恢复到C级2例,恢复到D级1例; C级恢复到D级5例,恢复到E级2例;