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Title: Comparison of a calcium phosphate bone substitute with recombinant human bone morphogenetic protein-2: a prospective study of fusion rates, clinical outcomes and complications with 24-month follow-up.
Epworth Authors: Malham, Gregory
Other Authors: Parker, Rhiannon
Keywords: Recombinant Human Bone Morphogenetic Protein-2
Beta Tricalcium Phosphate
Fusion Rates
Clinical Outcomes
Lateral Lumbar Interbody Fusion
Back Pain
Leg Pain
Oswestry Disability Index
Mental Component Scores
Physical Component Scores
Interbody fusion
Spinal Surgery
Lumbar Fusion
Neurosciences Clinical Institute, Epworth HealthCare, Victoria, Australia
Issue Date: Dec-2016
Publisher: Springer
Citation: Eur Spine J. 2016 Dec 27.
Abstract: PURPOSE: Recombinant human bone morphogenetic protein-2 (rhBMP-2) generally provides high rates of clinical improvement and fusion. However, rhBMP-2 has been associated with adverse effects. Recently, a beta tricalcium phosphate (β-TCP) bone substitute has been developed. The aim of this study was to determine the fusion rates and clinical outcomes of patients treated with β-TCP compared to rhBMP-2. METHODS: One hundred and thirty-five consecutive patients who underwent lateral lumbar interbody fusion with β-TCP (n = 25) or rhBMP-2 (n = 110) in the interbody cage were included in the study. The 25 β-TCP patients were a group of consecutive patients from numbers 46 to 70. Clinical outcomes included back and leg pain, Oswestry Disability Index (ODI), and SF-36 physical and mental component scores (PCS and MCS). CT scans were performed at 6, 12, 18, and 24 months until confirmation of solid interbody fusion, with no further scans performed once fusion was achieved. Targeted CT at the operative level(s) was performed to reduce radiation exposure. RESULTS: At 24 months there was no significant difference between clinical outcomes of the β-TCP or rhBMP-2 patients, with improvements in back pain (46% and 49%; P = 0.98), leg pain (31 and 52%; P = 0.14), ODI (38 and 41%; P = 0.81), SF-36 PCS (37 and 38%; P = 0.87), and SF-36 MCS (8 and 8%; P = 0.93). The fusion rate was significantly higher for rhBMP-2 with 96% compared to 80% for β-TCP (P = 0.01). Separating patients into those with a standalone cage and those with supplemental posterior instrumentation, there was no significant difference between instrumented fusion rates of the β-TCP and rhBMP-2 patients at 6 (P = 0.44), 12 (P = 0.49), 18 (P = 0.31) or 24 (P = 0.14) months. For standalone patients there was a significant difference at 6 (P = 0.01), 12 (P = 0.008) and 18 months (P = 0.004) with higher fusion rates in the rhBMP-2 group; however, by 24 months this was not significant (P = 0.18). CONCLUSIONS: Comparable clinical outcomes and complication rates suggest that β-TCP is a viable alternative to rhBMP-2. The difference in fusion rates for the standalone patients suggests that β-TCP may require supplemental posterior instrumentation to enhance fusion.
DOI: 10.1007/s00586-016-4927-0
PubMed URL:
ISSN: 0940-6719
Journal Title: European Spine Journal
Type: Journal Article
Affiliated Organisations: Greg Malham Neurosurgeon, Suite 2, Level 1, 517 St. Kilda Road, Melbourne, VIC, 3004, Australia.
Type of Clinical Study or Trial: Prospective Study
Appears in Collections:Musculoskeletal

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