40 patients scheduled to undergo posterior lumbar interbody fusion with polyetheretherketone (PEEK) were randomized to receive either rhBMP-2 or autologous bone filling. After 2 years of follow up, no significant differences were found between the two groups in regards in the Oswestry Disability Index (ODI), the Short-Form 36 (SF-36) and Visual Analog Scores. However, patients receiving rhBMP had ...