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Lomas et al: Medium‐term outcomes of hybrid total hip arthroplasty in cats: Cemented femoral stem and cementless acetabular cup in 17 hips (2020–2023)
Veterinary Surgery 6, 2025

🔍 Key Findings

  • Hybrid THR in cats showed no major complications across 17 hips in 15 cats, including 2 bilateral cases.
  • Postoperative radiographs confirmed stable implant positioning with no loosening, migration, or dislocation in follow-up imaging.
  • Mean owner satisfaction was high, with a mean short-form feline musculoskeletal pain index (sf-FMPI) score of 2/36 at a mean follow-up of 438 days.
  • SCFE (slipped capital femoral epiphysis) was the most common indication, seen in 13/17 hips.
  • Partial tenotomy of rectus femoris origin resolved intraoperative medial patella luxation in 3 cases—no cats required surgical correction later.
  • A micro BFX cup allowed for increased acetabular offset, possibly reducing luxation risk even when using a +0 femoral head offset.
  • Hybrid THR was successfully used as a revision for failed CFX THR due to recurrent luxation—implants remained stable post-revision.
  • Use of oversized cups (12 mm) with shallow seating or medial breach still resulted in stable outcomes, suggesting good implant fixation even with reduced bone stock.

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← Articles

Lomas et al: Medium‐term outcomes of hybrid total hip arthroplasty in cats: Cemented femoral stem and cementless acetabular cup in 17 hips (2020–2023)
Veterinary Surgery 6, 2025

🔍 Key Findings

  • Hybrid THR in cats showed no major complications across 17 hips in 15 cats, including 2 bilateral cases.
  • Postoperative radiographs confirmed stable implant positioning with no loosening, migration, or dislocation in follow-up imaging.
  • Mean owner satisfaction was high, with a mean short-form feline musculoskeletal pain index (sf-FMPI) score of 2/36 at a mean follow-up of 438 days.
  • SCFE (slipped capital femoral epiphysis) was the most common indication, seen in 13/17 hips.
  • Partial tenotomy of rectus femoris origin resolved intraoperative medial patella luxation in 3 cases—no cats required surgical correction later.
  • A micro BFX cup allowed for increased acetabular offset, possibly reducing luxation risk even when using a +0 femoral head offset.
  • Hybrid THR was successfully used as a revision for failed CFX THR due to recurrent luxation—implants remained stable post-revision.
  • Use of oversized cups (12 mm) with shallow seating or medial breach still resulted in stable outcomes, suggesting good implant fixation even with reduced bone stock.

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Multiple Choice Questions on this study

In Lomas 2025 et al., on hybrid THR in cats, what technique was used intraoperatively to correct medial patellar luxation seen after implant reduction?

A. Block sulcoplasty
B. Partial tenotomy of rectus femoris origin
C. Tibial tuberosity transposition
D. Patellar groove deepening
E. Cruciate ligament release

Answer: Partial tenotomy of rectus femoris origin

Explanation: This technique resolved intraoperative patellar luxation in 3 cats and has not been previously reported.
In Lomas 2025 et al., on hybrid THR in cats, what was the most common indication for total hip replacement (THR) in this cohort?

A. Hip dysplasia
B. Traumatic luxation
C. Recurrent luxation post-CFX
D. Femoral head and neck excision
E. Slipped capital femoral epiphysis

Answer: Slipped capital femoral epiphysis

Explanation: SCFE accounted for 13 out of 17 hips treated, making it the most common indication.
In Lomas 2025 et al., on hybrid THR in cats, which component combination was used in all cases?

A. Cemented femoral stem and cemented acetabular cup
B. Cementless femoral and acetabular components
C. Cemented femoral stem and cementless acetabular cup
D. Cementless femoral stem and cemented acetabular cup
E. Monoblock femoral stem and cemented cup

Answer: Cemented femoral stem and cementless acetabular cup

Explanation: All cats received a CFX cemented femoral stem and a 12 mm BFX cementless acetabular cup.
In Lomas 2025 et al., on hybrid THR in cats, what postoperative complication was **not observed** in any of the 17 hips treated?

A. Patellar luxation
B. Implant loosening
C. Hip luxation
D. Medial femoral overgrowth
E. Postoperative infection

Answer: Hip luxation

Explanation: No cases of postoperative hip luxation were observed, despite variable implant angles.
In Lomas 2025 et al., on hybrid THR in cats, what was the reported mean sf-FMPI (feline musculoskeletal pain index) score at medium-term follow-up?

A. 12/36
B. 6/36
C. 4/36
D. 2/36
E. 0/36

Answer: 2/36

Explanation: The mean sf-FMPI score was 2/36, indicating low owner-perceived pain.

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