Fig. 6.

Japanese Orthopedic Association Score (JOA) pre-operatively, at 1 week, and at 3, 6,12,24 months post-operatively between spread group and none-spread group. The JOA score in spread group one week after surgery was higher than that in none-spread group (p<0.05). No significant difference was observed subsidence between the two groups at 3, 6,12,24 months post-operatively (p>0.05)