Effect of Tibial Plateau Angle on Cranial Cruciate Ligament Strain: An <i>Ex Vivo</i> Study in the Dog

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  • Kevin H. Haynes
    University of Minnesota College of Veterinary Medicine St. Paul Minnesota
  • Jeffrey Biskup
    University of Minnesota College of Veterinary Medicine St. Paul Minnesota
  • Andrew Freeman
    Excelen: Center for Bone and Joint Research and Education Minneapolis Minnesota
  • Michael G. Conzemius
    University of Minnesota College of Veterinary Medicine St. Paul Minnesota

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<jats:sec><jats:title>Objective</jats:title><jats:p>To evaluate the relationship between tibial plateau angle (TPA) and strain in the intact cranial cruciate ligament (CCL) during axial loading.</jats:p></jats:sec><jats:sec><jats:title>Study Design</jats:title><jats:p><jats:italic>Ex vivo</jats:italic> mechanical testing study.</jats:p></jats:sec><jats:sec><jats:title>Sample Population</jats:title><jats:p>Cadaveric canine stifles (n = 6).</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>A bicentric and uni‐radial Slocum saw blade was used to perform the osteotomy on each stifle and a custom designed plate was secured to the leg. Each stifle was loaded and CCL strain and axial displacement were recorded. TPA was adjusted to −20°, −10°, 0°, +10°, +20° of normal. Change in the strain was assessed during the axial loading period.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>For all specimens, linear displacement of the femur and CCL strain increased with increasing axial load. Mean change in strain was 4.41, 5.26, 6.02, 6.3, and 7.39 at −20°, −10°, 0°, 10°, and 20°, respectively. The R‐squared for the linear regression equation was 0.91, suggesting a strong relationship between change in TPA and CCL strain.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>The mechanical testing model used found CCL strain increased with increasing axial load regardless of the TPA. Decreasing TPA decreased strain in the intact CCL.</jats:p></jats:sec>

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