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Gross Trunnion Failure of a Cobalt-Chromium Femoral Head on a Titanium Stem at Midterm Observe-up: A Report of three Instances.

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Gross Trunnion Failure of a Cobalt-Chromium Femoral Head on a Titanium Stem at Midterm Observe-up: A Report of three Instances.

JBJS Case Join. 2016 Oct-Dec;6(four):e96

Authors: Runner RP, Bellamy JL, Roberson JR

Summary
CASE: Three sufferers underwent uncomplicated main whole hip arthroplasty with cobalt-chromium femoral heads (36+5 mm) on titanium V40 tapers. At 6 to 9 years of follow-up, extreme results of corrosion on the trunnion had been famous in all three sufferers, together with elevated ranges of serum cobalt ions and regular ranges of serum chromium ions. Gross trunnion failure, apparently attributable to corrosion, required femoral stem revision in all the sufferers.
CONCLUSION: Decreased neck diameter, longer trunnion size, and large-sized cobalt-chromium heads are doable contributors to early failure after main whole hip arthroplasty resulting from trunnionosis. Surgeons must be conscious of trunnionosis as a reason behind ache and a mechanism of failure following whole hip arthroplasty, and serum steel ions must be monitored in these sufferers.

PMID: 29252750 [PubMed – indexed for MEDLINE]

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