Inclusion and exclusion criteria.
| Patients | Adults (>18 years old) treated for: Degenerative disc disease Disc herniation Spondylolisthesis Scoliosis Spinal stenosis Adjacent segment disease | Pediatric and adolescent Tumor Infection Trauma |
| Intervention | Lateral lumbar interbody fusion Transpsoas interbody fusion | |
| Study | English language RCT Observational studies Level I/II/III evidence | Non-English Review articles Case reports Level IV evidence n < 10 |
| Outcome | Lower extremity pain, weakness and sensory and motor deficits Risk factors Long-term outcomes |