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General Orthopaedics

JOINT EFFUSION VOLUME DOES NOT PREDICT BLOOD COBALT AND CHROMIUM ION LEVELS.

The International Society for Technology in Arthroplasty (ISTA), 28th Annual Congress. PART 2.



Abstract

Aim

Adverse tissue reactions have been a concern in relation to metal components, particularly in hip replacements. We look at a possible correlation between hip joint effusion and metal ion levels.

Materials and methods

56 patients,(42M, 14F) agreed to the study. All had metal-on-mental arthroplasties. Average age was 64.2 (SD 9.8). All patients were asymptomatic.

Ultrasound examination performed by one ultrasonographer, using a Sonosite M-Turbo machine with a C60X/5-2 MHz transducer.

Cobalt levels were assessed using an inductively coupled plasma mass spectrometer. Chromium levels were assessed using a graphite furnace atomic absorption spectrometer.

Results

Average blood ion levels were:

  • Cobalt 39.02 nmol/L. (SD41.18) range 3 to 215.

  • Chromium 52.51 nmol/L (SD47.48) range 5 to 284

  • Average Volume: 10.38ml (SD21.3) Range 0 to 219.

Conclusion

There was no statistically significant correlation between joint effusion and metal ion levels.


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