Revision of a canine Zürich cementless total hip replacement using a ‘Cupless’ system

Abstract

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.

Biomechanical evaluation of a new femoral stem design for total hip replacement in a canine model

“…Canine cementless total hip replacement provides excellent clinical outcomes. However, complications such as subsidence, periprosthetic fractures, stress shielding and infections still occur 18 , 19 . Despite improvements in existing systems over recent years 1 , 2 , 11 , 12 , the development of new implants should reduce the currently reported complication rate 20 , 21 .…”