There would be no difference in the risk of sympathetic plexus damage between the pre sympathetic plexus approach and the post sympathetic plexus approach.

Compare the incidence of sympathetic chain injury between front and back of sympathetic approach in oblique lumbar interbody fusion

Inclusion Criteria:

• Patients with lumbar degenerative disease needs a lateral lumbar interbody fusion of 1-2 segments between L2 to S1.

Exclusion Criteria:

• Patients who had previously had lumbar surgery
• Patients with muscle weakness of motor grade III or lower
• Patients with neuropsychiatric diseases such as depression
• Patients with musculoskeletal disease, inflammatory musculoskeletal disease, or infection
• Patients with cancerous disease
• Patients who do not want to participate in the study

Patients with lumbar degenerative disease