Abstract
Objective The purpose of this study was to retrospectively evaluate the complications and long-term
outcomes of total hip arthroplasty (THA) using a hybrid cementless system.
Materials and Methods Medical records of dogs that underwent THA using a combined implant system consisting
of Innoplant Screw Cup, Kyon taper head and Zurich cementless (Z-THA) stem between
March 2010 and March 2015 were reviewed. Dogs with a minimum follow-up of 2 years
were included. Signalment, complications and outcome at the latest follow-up examination
were recorded.
Results Sixteen hybrid THA were performed in 12 dogs. Mean follow-up was 42.5 months. Overall
complications occurred in three arthroplasties (19%) including luxation (n = 1), aseptic cup loosening (n = 1) and implant failure with screw breakage followed by stem subsidence (n = 1). Two arthroplasties including prosthesis luxation and aseptic cup loosening
were successfully revised using the here described hybrid system and achieved full
functional outcome at the last follow-up examination. One arthroplasty with screw
breakage and secondary stem subsidence was treated conservatively and achieved an
acceptable outcome.
Conclusion Hybridization of the Innoplant Screw Cup, Kyon taper head and Zurich cementless for
initial THA surgery is feasible. In comparison with the reported complications and
outcomes for single implant THA systems, the hybrid THA did not prove to have greater
clinical benefits for use in primary THA surgery.
Keywords
total hip arthroplasty - total hip replacement - Helica - Kyon
