Clinical Performance and Bearing Surface Morphology of a Total Hip Replacement Implant after 9 Years of In Vivo Service
World Small Animal Veterinary Association Congress Proceedings, 2017
C. Zindl1; M.P. Sutcliffe2; W.O. Liska3; M.J. Allen4
1Department of Veterinary Medicine, Queen’s Veterinary School Hospital, Cambridge, UK; 2Engineering Department, University of Cambridge, Cambridge, UK; 3Global Veterinary Specialists, Sugar Land, TX, USA; 4Department of Veterinary Medicine, Queen’s Veterinary School Hospital, University of Cambridge, UK


Total hip replacement (THR) is highly effective in reducing pain and improving mobility in dogs with hip osteoarthritis (OA). In humans, THR longevity is often limited implant wear, osteolysis and aseptic loosening, but the significance of these processes in dogs remains controversial.


The goal of this case study was to document a detailed retrieval analysis on a THR implant after 9 years of active in vivo service.


A spayed female Catahoula Mix (6.5 years, 29 kg) with severe hip dysplasia underwent left cemented (CFX, BioMedtrix LLC) total hip replacement. The routine post-operative rehabilitation period was followed by annual radiographic rechecks and the owner recorded the dog’s activity with a pedometer. The dog was euthanised for reasons unrelated to the THR and tissues were submitted for retrieval analysis (histological analysis of periprosthetic tissues and tribological analysis of the acetabular cup and femoral head). Data from the implanted components were compared with age­ matched, non-implanted implants.


After an uneventful recovery, the dog returned to an active lifestyle after surgery, running over 9000 miles on the operated hip. Profilometry revealed excellent congruency between cup and femoral head, although the surfaces of both components were rougher than those of the non-implanted implants. The femoral head exhibited small scratches only. On histology, there was excellent preservation of the stem-cement and cement­bone interfaces.


Cemented THR implants can provide a robust, long-term solution for dogs with hip OA. Retrieval studies produce objective data to support or refute the safety and long­term performance of current and novel implant systems.


Speaker Information
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M.J. Allen
Surgical Discovery Centre
Department of Veterinary Medicine
Queen's Veterinary School Hospital
Cambridge, UK

W.D. Liska
Global Veterinary Specialists
Sugar Land, TX, USA

M.P. Sutcliffe
Engineering Department
University of Cambridge
Cambridge, UK

C. Zindl
Department of Veterinary Medicine
Queen's Veterinary School Hospital
University of Cambridge
Cambridge, UK

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