PMC5874973_01
Left metal-on-metal THA with a pseudocyst.
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Following the onset of severe pain in the left hip, imaging (X-rays, ultrasound, and CT) revealed a calcified pseudocyst (Figure 1), a frequent complication of metal-on-metal prostheses.
Change in serum chromium and cobalt levels over time.
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The serum chromium and cobalt levels had risen to 71 nmol/L and 145 nmol/L, respectively (Figure 2), and appeared to be correlated with the patient's pain levels, although the precise cause of the pain remained unclear.
Endosteal osteolysis around the stem.
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A hip X-ray showed marked endosteal osteolysis around the stem (Figure 3).
Postoperative X-ray.
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We decided to replace the prosthesis and proceeded to implant a cementless stem and a dual mobility cup (Figure 4).