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- Title
Metal artifact reduction MRI of total ankle arthroplasty implants.
- Authors
de Cesar Netto, Cesar; Fonseca, Lucas F.; Fritz, Benjamin; Stern, Steven E.; Raithel, Esther; Nittka, Mathias; Schon, Lew C.; Fritz, Jan
- Abstract
<bold>Objectives: </bold>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.<bold>Methods: </bold>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.<bold>Results: </bold>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=<0.001), fracture (p=0.001), interface osteolysis (p=0.003), synovitis (p=0.027) and tendinopathy (p=0.034). The number of differential diagnoses in symptomatic subjects after the MRI with CS-SEMAC decreased from 3 (1-4) to 1 (1-2) (p<0.001).<bold>Conclusions: </bold>MRI of TAA implants with CS-SEMAC improves the diagnosis of interface osteolysis, periprosthetic bone marrow oedema, fractures and tendinopathy when compared to high-BW TSE, and has a positive effect on patient management.<bold>Key Points: </bold>• High-bandwidth TSE and compressed sensing SEMAC improve MRI of ankle arthroplasty implants. • Compressed sensing SEMAC improves bone-implant interfaces, periprosthetic bone, tendons and joint capsule visibility. • Compressed sensing SEMAC improves the diagnosis of osteolysis, tendinopathy, fractures and synovitis. • MRI decreases the number of clinical differential diagnoses of painful ankle arthroplasty implants.
- Subjects
MAGNETIC resonance imaging; FRACTURE fixation; ORTHOPEDIC implants; BONE resorption; DIAGNOSTIC imaging
- Publication
European Radiology, 2018, Vol 28, Issue 5, p2216
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-017-5153-9