Heterotopic Bone Formation With the Use of rhBMP2 in Posterior Minimal Access Interbody Fusion
Why this work is in the frame
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Bibliographic record
Abstract
STUDY DESIGN: Observational study with prospective CT analysis. OBJECTIVE: To assess the incidence and clinical sequelae of epidural bone formation following the adjunctive use of recombinant bone morphogenetic protein 2 (rhBMP2) with local autogenous bone graft use of (rhBMP2) in minimal access interbody (PLIF and TLIF) fusions. SUMMARY OF BACKGROUND DATA: The use of rhBMP2 for interbody fusion is associated with high fusion rates. However, for posterior approaches, concerns regarding heterotopic bone formation within the epidural space have been raised. METHODS: An independent CT analysis of 33 consecutive patients following minimal access lumbar fusion (PLIF [n = 10] or TLIF [n = 23]) with [n = 23] and without [n = 10] rhBMP2 was performed. Bone formation was graded in a centrifugal manner (intradiscal, anular/ALL/PLL, epidural [canal/foramen] and beyond the spine). In all BMP cases, a constant dose of 4.2 mg/disc level was administered (lowest commercially available dose). In all cases, local autograft was used. Review and assessment of prospectively collected outcomes data were performed. RESULTS: Average clinical and CT (minimum 6 months) follow-up was 25.0 and 7.9 months, respectively. Bridging bone (fusion) was seen in 100% of the BMP group and 90% without BMP. Epidural bone formation occurred in 20.8% with the use of BMP (5 levels: n = 1 spinal canal and n = 4 within the foramen) compared with 8.3% (1 level: canal) without BMP. Foraminal bone formation was seen only in the TLIF group. All epidural bone formation was heterotopic, and no ectopic bone formation occurred. There were no clinical sequelae associated with heterotopic bone formation. The mean preoperative and postoperative Oswestry Disability Index was 50.2% (range, 25%-75%) and 11.3% (range, 0%-38%) respectively. CONCLUSION: Although the adjunctive use of rhBMP2 is associated with a higher incidence of heterotopic bone, there does not seem to be any associated clinical sequelae.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it