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