Increased Swelling Complications Associated With Off-Label Usage of rhBMP-2 in the Anterior Cervical Spine

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Abstract

Study Design/Setting.

Independent, retrospective clinical record review with a concurrent control.

Objective.

To identify whether rhBMP-2 is associated with an increased incidence of clinically relevant postoperative prevertebral swelling problems in patients undergoing anterior cervical fusions.

Summary of Background Data.

Bone Morphogenetic Protein-2 (rhBMP-2) is FDA approved as a bone graft substitute in anterior lumbar interbody fusions. rhBMP-2 has also been used “off-label” in anterior cervical fusions. We suspected that rhBMP-2 might increase the incidence of adverse swelling events.

Methods.

A total of 234 consecutive patients (ages 12–82 years) undergoing anterior cervical fusion with and without rhBMP-2 over a 2-year period at one institution comprised the study population. The incidence of clinically relevant prevertebral swelling was calculated. The populations were compared and statistical significance was determined.

Results.

A total of 234 patients met the study criteria, 69 of whom underwent anterior cervical spine fusions using rhBMP-2; 27.5% of those patients in the rhBMP-2 group had a clinically significant swelling event versus only 3.6% of patients in the non-rhBMP-2 group. This difference was statistically significant (P < 0.0001) and remained so after controlling for other significant predictors of swelling.

Conclusions.

Off-label use of rhBMP-2 in the anterior cervical spine is associated with an increased rate of clinically relevant swelling events.

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