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DALLAS — Pseudotumor formation occurred in 52% of patients who underwent metal-on-metal total hip arthroplasty performed with two different designs of prostheses and later underwent metal artifact reduction sequence MRI or MARS MRI of the hip, a presenter said at the American Association of Hip and Knee Surgeons Annual Meeting.

Daniel E. Goltz

“So overall prevalence and severity, over half of our patients had a pseudotumor and nearly 40% either had a type 2 or type 3 lesion,” Daniel E. Goltz, BS, said.

 The 207 hips that underwent MARS MRI received an ASR THA prosthesis or a Pinnacle prosthesis with Ultamet liner (both DePuy) metal-on-metal (MoM) hip implant. The patients represented just the patients who had MARS MRI and had any pseudotumors graded among 178 patients with ASR prostheses and 788 patients with Pinnacle prostheses who were operated on between 2002 and 2013 and had a minimum 2-year follow-up and average 8-year follow-up.

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