Figure 8

Surgery session analysis combining the SEP with H-reflex. The time is in hour:minutes AM. The detailed surgical steps are here presented: 1 09:05 Initial EP an H-Reflex 2 10:00 The EP and H-Reflex are still unmodified 3 10:11 Risky surgery phase is started 4 10:13 After hammer blows: EP and H-reflex have reduced amplitudes 5 10:15 H-reflex is increased but EP amplitude is still low 6 10:21 EP and H-reflex are normal 7 10:25 After hammer blows: EP and H-reflex are weak 8 10:30 EP and H-reflex are normal 9 10:35 Vertebral column traction: EP and H-reflex have very low amplitudes 10 10:39 After traction: very slow amplitude increasing especially for EP 11 10:45 New traction: EP amplitude is very low 12 10:54 After traction: EP is absent and the H-reflex is low 13 11:09 EP and H-reflex are normal 14 11:24 After hammer blows: EP and H-reflex have low amplitudes 15 11:28 Risky surgery phase ended, EP and H-flex are normal 16 11:50 Surgery end, EP and H-flex are normal