Imaging of Postoperative Avascular Necrosis of the Ankle and Foot

Craig A. Buchan; Dawn H. Pearce; Johnny Lau; Lawrence M. White

doi:10.1055/s-0032-1320060

Seminars in Musculoskeletal Radiology, Inhaltsverzeichnis

Semin Musculoskelet Radiol 2012; 16(03): 192-204
DOI: 10.1055/s-0032-1320060

Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Imaging of Postoperative Avascular Necrosis of the Ankle and Foot

Craig A. Buchan

¹Joint Department of Medical Imaging,Mount Sinai Hospital, Toronto, Ontario, Canada

²University Health Network and Women's College Hospital, University of Toronto, Toronto, Ontario, Canada

³Department of Medical Imaging, Gold Coast Hospital, Southport, Australia

,

Dawn H. Pearce

⁴Department of Radiology, St. Michael's Hospital, University of Toronto, Toronto, Ontario, Canada

,

Johnny Lau

⁵Department of Orthopedic Surgery, Toronto Western Hospital, University Health Network and Women's College Hospital, University of Toronto, Toronto, Ontario, Canada

,

Lawrence M. White

¹Joint Department of Medical Imaging,Mount Sinai Hospital, Toronto, Ontario, Canada

²University Health Network and Women's College Hospital, University of Toronto, Toronto, Ontario, Canada

› Institutsangaben

Abstract

Avascular necrosis (AVN) of the ankle and foot is an uncommon and often unexpected postoperative complication in patients with persistent pain and disability postprocedure. Artifacts from metallic implants may obscure characteristic imaging signs of AVN, and radiography and computer tomography are the mainstay imaging modalities of the postoperative ankle and foot. MRI and nuclear medicine imaging play an important complementary role in problem solving and excluding differential diagnostic considerations including infection, nonunion, occult fracture, and secondary osteoarthritis.

This review article evaluates different imaging modalities and discusses characteristic sites of AVN of the ankle and foot in the postoperative setting including the distal tibia, talus, navicular, and first and lesser metatarsals. Radiologists play a key role in the initial diagnosis of postoperative AVN and the surveillance of temporal evolution and complications including articular collapse and fragmentation, thus influencing orthopedic management.

Keywords

avascular necrosis - osteonecrosis - foot and ankle - postoperative - magnetic resonance imaging

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Referenzen

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