Metallosis with pseudotumour formation: Long-term complication following cementless total hip replacement in a dog

Nicola J. Volstad; Susan L. Schaefer; Laura A. Snyder; Jeffrey B. Meinen; Susannah J. Sample

doi:10.3415/VCOT-16-02-0028

Veterinary and Comparative Orthopaedics and Traumatology, Table of Contents

Vet Comp Orthop Traumatol 2016; 29(04): 283-289
DOI: 10.3415/VCOT-16-02-0028

Case Report

Schattauer GmbH

Metallosis with pseudotumour formation: Long-term complication following cementless total hip replacement in a dog

Nicola J. Volstad

¹Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA

,

Susan L. Schaefer

¹Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA

,

Laura A. Snyder

²Marshfield Labs, Marshfield Clinic, Marshfield, WI, USA

,

Jeffrey B. Meinen

³Wisconsin Veterinary Referral Center, Waukesha, WI, USA

,

Susannah J. Sample

¹Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI, USA

› Author Affiliations

Abstract

Summary

Case description: A 10-year-old female Belgian Teruven dog was presented to our clinic for total hip revision following a diagnosis of implant (cup) failure with metallosis and abdominal pseudotumour formation. The patient had a cementless metal-on-polyethylene total hip replacement performed nine years prior to presentation.

Clinical findings: The clinical findings, including pseudotumour formation locally and at sites distant from the implant and pain associated with the joint replacement, were similar to those described in human patients with this condition. Histopathological, surgical, and radiographic findings additionally supported the diagnosis of metallosis and pseudotumour formation.

Treatment and outcome: Distant site pseudo -tumours were surgically removed and the total hip replacement was explanted due to poor bone quality. The patient recovered uneventfully and has since resumed normal activity.

Conclusion: In veterinary patients with metal-on-polyethylene total hip implants, cup failure leading to metallosis and pseudo-tumour formation should be considered as a potential cause of ipsilateral hindlimb lameness, intra-pelvic abdominal tumours, or a combination of both. These clinical findings may occur years after total hip replacement surgery.

Keywords

Total hip replacement - metallosis - pseudo -tumour - canine orthopaedics

Full Text

References

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