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Vet Comp Orthop Traumatol 2015; 28(01): 60-66
DOI: 10.3415/VCOT-13-10-0128
Case Report
Schattauer GmbH

Acetabular cup liner and prosthetic head exchange to increase the head diameter for management of recurrent luxation of a prosthetic hip in two dogs

S. C. Roe
1   Department of Clinical Sciences, North Carolina State University, College of Veterinary Medicine, Raleigh, North Carolina, USA
,
C. Sidebotham
2   BioMedtrix, LLC, Boonton, New Jersey, USA
,
D. J. Marcellin-Little
1   Department of Clinical Sciences, North Carolina State University, College of Veterinary Medicine, Raleigh, North Carolina, USA
› Author Affiliations
Further Information

Publication History

Received:06 June 2014

Accepted:30 October 2014

Publication Date:
26 December 2017 (online)

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Summary

Component malalignment and impingement are possible causes of recurrent luxation following total hip replacement in the dog. In the two cases presented in this report, luxation that was probably due to impingement was managed by exchanging the standard 17 mm prosthetic head for a 24 mm prosthetic head. This required removal of the original acetabular cup liner and placement of a new polyethylene liner that would accept the 24 mm head into the stable acetabular shell. In the first case, a 50 kg Malamute dog, recurrent luxation was initially managed by component alignment revision, iliofemoral suture, triple pelvic osteotomy and a novel lasso technique, without long-term success. After exchanging the head and cup liner, luxation did not recur over a 12-month period. In the second case, a 65 kg Newfoundland dog, impingement was suspected after a second luxation event. Luxation did not recur during the nine months after exchange of the head and cup liner. The larger prosthetic head used in these two cases increased the impingement-free range-of-motion of the joint and increased the translation distance required for luxation (jump distance).

Keywords

Total hip replacement - impingement - cup liner exchange - luxation - head diameter

 

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