A preliminary comparative study of radiographic results using mineralized collagen and bone marrow aspirate versus autologous bone in the same patients undergoing posterior lumbar interbody fusion with instrumented posterolateral lumbar fusion.
BACKGROUND
Multiple bone graft substitutes for spinal fusion have been studied with varying results.


OBJECTIVE
The purpose of this study was to assess the effectiveness of a mineralized collagen matrix combined with bone marrow, versus autologous bone, in the same patients undergoing a posterior lumbar interbody fusion and an instrumented posterolateral lumbar fusion.


METHODS
A prospective, comparative study.


METHODS
Patients indicated for one-level posterior lumbar interbody fusion and instrumented posterolateral lumbar fusion, serving as self-controls.


METHODS
Thin-cut computed tomographic scans with sagittal reconstruction and plain radiographs, including lateral flexion/extension views were performed and assessed at 12 and 24 months after surgery. Oswestry Disability Index and Visual Analog Scale questionnaires were completed by all patients preoperatively and at 12 and 24 months after surgery.


METHODS
After informed consent and failure of nonoperative treatment, 25 consecutive patients requiring one-level instrumented posterolateral fusion combined with posterior interbody fusion were enrolled in the study. Mineralized collagen bone graft substitute combined with bone marrow aspirate was used on one side of the posterolateral fusion, with iliac crest autograft on the contralateral side.


RESULTS
A fusion rate of 84% (21/25) was achieved for the autologous bone grafts and 80% (20/25) for the bone graft substitute. The interbody fusion rate was 92% (23/25). Mean Oswestry Disability Index (ODI) scores decreased 57.2% at 12 months and 55.6% at 24 months, compared with baseline.


CONCLUSIONS
Mineralized collagen bone graft substitute exhibited similar radiographic results compared with autograft in this model. Further trials incorporating bilateral fusion, as well as posterolateral fusion alone without interbody fusion are warranted to confirm the results of this study.
Kitchel
Scott H
SH
Oregon Health & Sciences University, 3181 SW Sam Jackson Park Road, Portland, 97201, USA. shk@orthopedicspineassociates.com
D000328:Adult; D000368:Aged; D001707:Biopsy, Needle; D001853:Bone Marrow / Q000473:pathology*; D001842:Bone and Bones / Q000473:pathology*; D003094:Collagen; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012189:Retrospective Studies; D013123:Spinal Fusion / Q000379:methods*; D013166:Spondylitis / Q000601:surgery
D003094:Collagen