Figure 4

Frequency of complications. The frequency of asymptomatic ASD was significantly higher in the O group. There was no significant difference in symptomatic ASD between the O group and T group, and no significant difference in reoperation cases between the O group and T group. Abbreviations: T group, patients who underwent single-level transforaminal lumbar interbody fusion; O group, patients who underwent single-level oblique lateral interbody fusion; ASD, adjacent segment disorder.