Posterior Lumbar Interbody Fusion (PLIF) Posterior lumbar interbody fusion (PLIF) uses a posterior approach to create intervertebral fusion. It may be used to manage degenerative disk disease, severe instability, spondylolisthesis, deformity and pseudarthrosis. Contact Us Related Products CONCORDE® Inline Lumbar Interbody System View ProductConduit View Product 148775-200805