Daniel Lomas 1, Sorrel Langley-Hobbs 2, Kevin Parsons 1, Nicolas Barthelemy 1

Background
Total hip arthroplasty (THA) is used to restore function in feline patients with severe hip pathology. While canine THA outcomes are well-documented, reports on feline THA, especially hybrid systems combining a cemented femoral stem with a cementless acetabular cup, are scarce. The study aimed to assess medium-term clinical outcomes, implant stability, and complications associated with hybrid THA in cats.

Methods
A retrospective review included cats that underwent hybrid THA between 2011 and 2021, with a minimum follow-up of six months. Clinical records were evaluated for signalment, indication for THA, perioperative data, complications, and outcomes. Radiographs were reviewed to assess implant positioning, stability, and presence of complications such as loosening or luxation. Owner follow-up was conducted via telephone to gauge functional outcomes and satisfaction.

Results
The study evaluated 20 THA procedures in 18 cats. Most THAs were performed due to hip dysplasia or trauma-related osteoarthritis. All femoral stems remained radiographically stable, and 90% of acetabular cups showed osseointegration without signs of loosening. Major complications occurred in 15% of cases, including luxation and sciatic neuropraxia; minor complications occurred in 25%, mainly transient lameness or seroma. No cases required implant removal. Owner-reported outcomes indicated good to excellent function in all followed-up cats, with a median follow-up of 29 months.

Limitations
This retrospective study included a relatively small sample size and lacked standardized, objective functional assessments. Radiographic evaluations were subject to interpretive variability, and long-term outcomes beyond three years were not assessed for most patients. Potential reporting bias from owner follow-ups was acknowledged.

Conclusions
Hybrid total hip arthroplasty using a cemented femoral stem and a cementless acetabular cup appears to be a viable surgical option for cats, offering stable implant fixation and good medium-term clinical outcomes. While complication rates were comparable to other feline THA techniques, further prospective studies with long-term follow-up are needed to validate these findings.

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