Evaluation of femoral isometric placement accuracy of internal brace implants and its impact on stifle stability in the management of pivot shift phenomenon following TPLO
Authors: Sebastian Wylie, Miguel A. Solano, Alan Danielski
Journal: Veterinary Surgery
Publication year: 2025
DOI: 10.1111/vsu.14319
IBISG Summary
This retrospective observational study evaluated the accuracy of femoral internal brace implant placement and its relationship with stifle stability in 39 dogs (46 stifles) undergoing TPLO with internal brace augmentation. Implant position, pivot-shift grade and internal tibial rotation were assessed using clinical records, intraoperative findings and radiographs.
Key Findings
Accurate femoral implant placement was achieved in 63% of stifles. SwiveLock implants were placed accurately more often than FASTak anchors (78.6% versus 38.9%), while greater patient weight was associated with improved placement accuracy. Pivot-shift grade improved in 90.9% of stifles at follow-up. Inaccurate placement was associated with increased internal tibial rotation.
Why This Research Matters
The findings show that accurate isometric placement of internal brace implants is important for optimising rotational stifle stability following TPLO. They also support the use of a standardised pivot-shift grading system and highlight the influence of implant choice and surgical technique. As this was a retrospective study, further prospective evaluation would strengthen the evidence.