Implant Failure of Bryan Cervical Disc due to Broken Polyurethane Sheath
Bibliographic record
Abstract
STUDY DESIGN: A case report. OBJECTIVE: A rare case of Bryan disc implantation failure due to broken polyurethane sheath was reported. The bone ingrowth at implant-bone interface and wear debris leaking from broken Bryan disc were also observed. SUMMARY OF BACKGROUND DATA: The Bryan disc is one of the most commonly used cervical prostheses and has shown satisfactory results compared with anterior cervical discectomy and fusion in short- and long-term follow-up. The complications, including neurological worsening, heterotopic ossification, kyphosis, and so forth, still occur, although infrequently. The broken polyurethane sheath is an extremely rare complication that has seldom been reported before. METHODS: A 55-year-old female patient experienced progressive neck pain after 8 years of Bryan disc implantation because of cervical spondylotic myelopathy at C5-C6 level. The subsequent magnetic resonance imaging scan demonstrated a cystic mass in front of Bryan disc, with high-signal intensity on T2-weighted images. The Bryan disc was removed and segment (C5-C6) was fused with cage and plate. The bone ingrowth and wear debris of retrieved Bryan disc were studied. RESULTS.: In revision surgery, a cyst with thick pseudocapsule connecting the anterior part of Bryan disc was excised. A transverse crack (5 mm) was identified in the anterior part of polyurethane sheath. The bacteria test of fluid from the cyst showed a negative result. Micro-computed tomography and histological study both indicated abundant bone ingrowth at implant-bone interface. The metal wear debris could be observed around titanium alloy shells. CONCLUSION: This case demonstrates the unique incident of broken Bryan disc after 8 years of implantation. Follow-up imaging shortly after the procedure should be mandatory to monitor such potential complication.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.002 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.006 | 0.002 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".