Conny Strm1,
Jrgen Strinnholm1, Sead Crnalic2, Morten Bruvold3,
Ulrike A. Blume4, Chiel den Harder3, Clemens Bos5
1Department
of Radiation Sciences, Ume University, Faculty of Medicine, Diagnostic
Radiology, Ume, Sweden; 2Department of Ortopedy, Ume University,
Faculty of Medicine, Ume, Sweden; 3Philips Healtcare, Best, Netherlands;
4Philips Healtcare, Hamburg, Germany; 5Division Image,
University Medical Center in Utrecht, Utrecht, Netherlands
Wear in metal-on-metal hip implants and released metallic debris and consequent complications caused recall of some products. Evaluation of the risk of complications is important, even before clinical symptoms arise, with T2 weighted (T2w) MRI to show inflammatory pseudotumor and synovitis locally. Slice Encoding for Metal Artifact Correction (SEMAC), resolves metal induced distortions. Here, T2w SEMAC and conventional T2w TSE are compared in their potential to show soft tissue changes close to the metal in 23 asymptomatic patients with metal-on-metal hip implants. With reduced artifact size (P<0.001), SEMAC unveiled significantly more osteolysis, fluid collection or pseudotumor, when present (P<0.001).
Keywords