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Revision of a canine Zürich cementless total hip replacement using a ‘Cupless’ system
  1. Ronald S Olsen and
  2. Otto I Lanz
  1. Small Animal Clinical Sciences, Virginia–Maryland Regional College of Veterinary Medicine, Blacksburg, Virginia, USA
  1. Correspondence to Dr Ronald S Olsen; ronaldsolsen90{at}


A 6-year-old spayed female pit bull mix developed lameness secondary to aseptic loosening of the acetabular component from a total hip replacement (THR) performed at 1 year of age with the standard Zürich cementless THR (Z-THR) system. It was treated by removing the acetabular component and replacing the standard femoral head prosthesis with the larger ‘Cupless’ femoral head. The acetabulum was reamed to accommodate it. The new prosthesis articulated directly with the reamed bone. One year later, the patient had no perceptible lameness and stable implants. Subsequent follow-up found appropriate ambulation and a high degree of owner satisfaction. The Zürich ‘Cupless’ hip replacement system aims to reduce some of the challenges associated with traditional THR. Though functional outcomes have not been scientifically compared with traditional THR, this case suggests it could be considered as an alternative to traditional THR procedures or for revision in cases with aseptic cup loosening.

  • total hip replacement
  • cupless
  • orthopaedics
  • revision
  • dogs
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  • Contributors OIL contributed the case material for this manuscript. The manuscript was written by RSO. Both authors contributed to revisions. Both authors reviewed and approved the final manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement All data relevant to the study are included in the article.

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