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Bearing choice matters: the case against metal revision

When a ceramic hip bearing fractures, revising to metal-on-polyethylene (MoP) is contraindicated. A 2025 systematic review & meta-analysis published in the Journal of Orthopaedics analyzed 30 peer-reviewed case reports describing the consequences of using metal bearings in revising a ceramic failure.

Researchers at Dublin’s National Orthopaedic Hospital Cappagh & St. Vincent’s University Hospital analyzed 31 cases of Prosthetic Hip-Associated Cobalt Toxicity (PHACT) – all linked to MoP revision following ceramic bearing fracture. The findings show that, even thorough irrigation & debridement may not fully remove microscopic ceramic particles. Those retained fragments cause abrasive wear on the new metal head, accelerating surface damage and triggering systemic cobalt release at levels far beyond safe thresholds.

 

Key takeaways

 

  • In 31 documented cases, revision of fractured ceramic hip bearings to MoP led to cobalt toxicity, driven by retained ceramic fragments causing abrasive wear against the metal head. Even with thorough irrigation and debridement, these particles were not fully removed, resulting in elevated blood cobalt concentrations (mean: 922.5 μg/L, median: 633.3 μg/L; range: 7-6521 μg/L).
  • The affected cohort included patients with a mean age of 58 years (median: 58, SD: 52.5-66); 54.8% were male and 45.2% female. Indications for primary THA were osteoarthritis (67.7%), avascular necrosis (22.6%), and hip fracture (9.7%). Fracture location: head (61.3%), liner (35.5%), both (3.2%).
  • The review reports 80.6% survivorship in the published cases included, which corresponds to 6 reported deaths in 31 cases. This survivorship rate reflects the severity of cobalt toxicity in the context of these case reports and does not estimate the incidence or risk in the broader patient population.
  • Revision of fractured ceramic hip bearings to MoP can result in cobalt toxicity due to ceramic-metal interaction. Retained microscopic ceramic particles can cause abrasive wear on a new metal head and exacerbate surface damage.
  • Common symptoms are multisystemic, including hearing loss (64.5%), cardiomyopathy (61.3%), hip pain (58.1%), hypothyroidism (58.1%), fatigue (54.8%), vision loss (48.4%), & paresthesia (41.9%).
  • Symptoms typically begin within 12 months of MoP revision; blood cobalt levels are noticeably elevated (median 633.3 μg/L).

 

Drs. Sweeney and Broderick stress that a ceramic-on-polyethylene (CoP) bearing must be used to minimize cobalt release and risk of toxicity/death. For patients already revised to MoP, early recognition, prompt cobalt testing, and registry-driven follow-up are essential to monitoring symptoms and improving outcomes. But revising a ceramic fracture with any material other than ceramic must be avoided.

 

📖 Sweeney P, Broderick J. A systematic review and meta-analysis of cases of prosthetic hip-associated cobalt toxicity in patients with prosthetic hip ceramic bearing fractures subsequently revised to metal-on-polyethylene implants. J of Orth 2025. doi:10.1016/j.jor.2025.12.064

 

Please check for regulatory approvalin your country.

 

This text reflects CeramTec’s summary of a peer‑reviewed scientific publication and does not constitute clinical guidance, risk prediction for individual patients, or product‑related recommendations. For product, safety, and risk information, always refer to the labeling of the legal manufacturer. This post was drafted with AI assistance and approved by CeramTec.

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