Delayed Failure of M6-C Cervical Disc Arthroplasty After Conversion of Adjacent Cervical Disc Arthroplasty to Fusion: A Case Report

JBJS Case Connect. 2023 Apr 18;13(2). doi: 10.2106/JBJS.CC.22.00788. eCollection 2023 Apr 1.


Case: We present a delayed failure of an M6-C cervical disc arthroplasty after conversion of a subjacent failed cervical disc arthroplasty to fusion. The annular component had failed, and the core had been ejected. Histology demonstrated a giant cell reaction to polyethylene debris, and tissue cultures were positive for Cutibacterium acnes.

Conclusion: This is the first report of M6-C failure after conversion of an adjacent arthroplasty to fusion. A growing number of reports surrounding the M6-C failure rate and mechanisms raise concern about the device's durability and underscore the importance of routine clinical and radiographic surveillance for these patients.

Publication types

  • Case Reports

MeSH terms

  • Arthroplasty
  • Cervical Vertebrae* / diagnostic imaging
  • Cervical Vertebrae* / surgery
  • Diskectomy*
  • Humans
  • Reoperation
  • Treatment Outcome