Study supports rigid fixation in canine limb press models
CURRENT BRIEF VERSION: A new cadaveric study in Veterinary Surgery suggests canine limb press models may be less sensitive to proximal femoral fixation choices than some researchers have worried. In 10 pelvic limbs from adult large-breed dogs, investigators compared rigid femoral fixation with a flexion-extension setup, while also varying stifle and hock angles to reflect early- and mid-stance. Quadriceps and gastrocnemius forces rose as axial load increased, but the fixation method and stance configuration had only limited effects overall, leading the authors to conclude that rigid femoral fixation remains a valid approach for canine limb press work. The study was published online ahead of print on February 2, 2026, by Glauco V. Chaves and James E. Miles of the University of Copenhagen and collaborators. (pubmed.ncbi.nlm.nih.gov)
Why it matters: For veterinary surgeons and biomechanics researchers, the finding supports continued use of simpler, more standardized rigid-fixation limb press models in ex vivo stifle research, including work that informs procedures such as TPLO and other stabilization techniques. That matters because a 2025 systematic review by some of the same authors found major heterogeneity in canine limb press methods, frequent problems with limb angulation reporting, and very limited data on simulated muscle and periarticular forces, raising questions about how well ex vivo models reflect in vivo loading. This new study directly addresses one of those gaps and suggests fixation method alone may not be a major source of bias in simulated muscle loading. In a separate orthopedic context, recent follow-up data in juvenile dogs treated with angle-stable interlocking nails for diaphyseal femoral fractures also offer some reassurance that proximal femoral anatomy can remain largely preserved through skeletal maturity: in 10 dogs, investigators found no meaningful risk of proximal femoral malformation, low pain scores, and only one significant radiographic difference versus the unaffected femur at maturity, a CORONA1 change thought to reflect reduced natural femoral procurvatum rather than clinically important deformity. (pubmed.ncbi.nlm.nih.gov)
What to watch: Expect follow-on work to focus less on proximal fixation alone and more on broader model validation, including whether ex vivo loading patterns match physiologic conditions closely enough to improve interpretation of orthopedic stability studies. At the clinical end, the newer fracture-fixation data also support continued scrutiny of long-term coxofemoral and proximal femoral outcomes in immature dogs, but without suggesting angle-stable interlocking nails should be avoided for juvenile diaphyseal femoral fracture repair. (pubmed.ncbi.nlm.nih.gov)