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Semin Musculoskelet Radiol 2018; 22(04): 444-456
DOI: 10.1055/s-0038-1653955
Review Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Dedicated CT and MRI Techniques for the Evaluation of the Postoperative Knee

Iman Khodarahmi
1   Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland
,
Elliot K. Fishman
1   Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland
,
Jan Fritz
1   Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, Maryland
› Author Affiliations
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Publication History

Publication Date:
22 August 2018 (online)

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Abstract

Advances in surgical techniques, orthopaedic implant design, and higher demands for improved functionality of the aging population have resulted in a high prevalence of patients with metallic implants about the knee. Total knee arthroplasty, knee-replacing tumor prostheses, and osteosynthesis implants create various imaging artifacts and pose special challenges for the imaging evaluation with computed tomography (CT) and magnetic resonance imaging (MRI). CT artifacts can be effectively mitigated with metal artifact reduction reconstruction algorithms, dual-energy data acquisition with virtual monoenergetic extrapolation, and three-dimensional postprocessing techniques, such as volume and cinematic rendering. Artifacts related to metal implants on MRI can be reduced via optimization of the scan parameters and using advanced techniques such as multi-acquisition variable-resonance image combination, and slice encoding for metal artifact correction.

Keywords

knee - arthroplasty - artifact - computed tomography - magnetic resonance imaging