Radiographic and CT features of metallosis in a lame dog after total hip replacement: the cloud sign

A 2‐year‐old female American Akita was referred for CT of the pelvis and hindlimbs due to a left hindlimb lameness after a left total hip replacement. Referral radiographs and CT images demonstrated amorphous soft‐tissue and mineral opacities surrounding the proximal femur and the prosthetic stem, c...

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Published inVeterinary radiology & ultrasound Vol. 65; no. 1; pp. 49 - 53
Main Authors Lucaci, Felix Daniel, Battiato, Pierantonio, Bassi, Jessica, Zani, Davide Danilo, De Zani, Donatella, Vezzoni, Aldo, Stranieri, Angelica, Longo, Maurizio
Format Journal Article
LanguageEnglish
Published England 01.01.2024
Subjects
bubble sign
hip dysplasia
postoperative complication
postoperative complication
bubble sign
hip dysplasia
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Summary:A 2‐year‐old female American Akita was referred for CT of the pelvis and hindlimbs due to a left hindlimb lameness after a left total hip replacement. Referral radiographs and CT images demonstrated amorphous soft‐tissue and mineral opacities surrounding the proximal femur and the prosthetic stem, consistent with the “cloud sign” reported as a characteristic of metallosis in humans. Dorsomedial displacement of the prosthetic head, multiple foci of geographic osteolysis alongside the “cloud sign”, presumed pseudotumor lesions, and medial iliac lymphadenopathy were also identified with CT. Metallosis was confirmed based on ultrasound‐guided cytology, revision surgery, and histopathology.
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ISSN:1058-8183
1740-8261
DOI:10.1111/vru.13322