Related Experiment Videos
Serum concentrations of chromium, cobalt and nickel after total hip replacement: a six month study
Insights
This study tracked metal levels in patients after hip replacement surgery. Postoperative increases in chromium and nickel were observed, highlighting potential concerns with modern hip implants.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Toxicology
Background:
- Total hip replacement (THR) is a common orthopedic procedure.
- Modern THR designs include metal-on-polymer implants.
- Concerns exist regarding metal ion release from implants.
Purpose of the Study:
- To investigate serum metal concentrations (chromium, cobalt, nickel) in patients undergoing conventional total hip replacement.
- To compare metal ion release profiles between conventional THR and other implant types.
Main Methods:
- Serum samples collected from 15 patients pre- and post-THR (up to 6 months).
- Analysis of chromium, cobalt, and nickel using electrothermal atomic absorption spectroscopy.
Main Results:
- Serum chromium peaked postoperatively, remaining elevated at 6 months.
- Serum cobalt levels remained stable or decreased.
- Serum nickel levels increased 2-6 weeks after surgery.
Conclusions:
- Conventional total hip replacement with metal-on-polymer components leads to detectable changes in serum metal levels.
- Observed metal ion release differs from that reported for metal-on-metal implants.
- Further monitoring is warranted for patients with these modern hip implants.
Abstract:
Serum specimens were obtained from 15 patients before undergoing conventional total hip replacement and for periods of up to six months postoperatively. The specimens were analysed for chromium, cobalt and nickel by electrothermal atomic absorption spectroscopy. Serum chromium levels were found to rise to a pronounced postoperative peak and then diminish, although not falling to normal mean levels by six months. Serum cobalt levels either remained the same or decreased while serum nickel levels began to rise two to six weeks after surgery. These results are significant in that serum metal concentration changes have been reported for patients receiving metal-on-metal implants but not for patients with metal-on-polymer total hip implants of more modern designs.