Porous Tantalum Metaphyseal Cones for Severe Femoral and Tibial Bone Defects in Revision Total Knee Arthroplasty are Reliable for Fixation at Mean 5-Year Follow-Up.

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Abstract

[Indexed for MEDLINE] 19. Eur Radiol. 2018 May;28(5):2216-2227. doi: 10.1007/s00330-017-5153-9. Epub 2017 Dec 7. Metal artifact reduction MRI of total ankle arthroplasty implants. de Cesar Netto C(1)(2), Fonseca LF(1), Fritz B(3)(4), Stern SE(5), Raithel E(6), Nittka M(6), Schon LC(1), Fritz J(7). Author information: (1)Department of Orthopedic Surgery, MedStar Union Memorial Hospital, Baltimore, MD, USA. (2)Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA. (3)Department of Radiology, Balgrist University Hospital, Zurich, Switzerland. (4)Faculty of Medicine, University of Zurich, Zurich, Switzerland. (5)Bond Business School, Bond University, Gold Coast, QLD, Australia. (6)Siemens Healthcare GmbH, Erlangen, Germany. (7)Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, USA. jfritz9@jhmi.edu. OBJECTIVES: To assess high-bandwidth and compressed sensing-(CS)-SEMAC turbo spin echo (TSE) techniques for metal artifact reduction MRI of total ankle arthroplasty (TAA) implants. METHODS: Following institutional approval and consent, 40 subjects with TAA implants underwent 1.5-T MRI prospectively. Evaluations included bone-implant interfaces, anatomical structures, abnormal findings and differential diagnoses before and after MRI. AUCs of P-P plots were used to determine superiority. Statistical differences were evaluated with McNemar and chi-square tests. P-values ≤ 0.05 were considered significant. RESULTS: CS-SEMAC TSE was superior to high-bandwidth TSE in showing the bone-implant interfaces (AUC=0.917), periprosthetic bone, tendons and joint capsule (AUC=0.337-0.766), bone marrow oedema (43 % difference, p=0.041), interface osteolysis (63 %, p=0.015), tendinopathy (62 %, p=0.062), periprosthetic fractures (60 %, p=0.250), synovitis (43 %, p=0.250), as well as reader confidence for bone marrow oedema (p=