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Effect of Tibial Plateau Angle on Cranial Cruciate Ligament Strain: An Ex Vivo Study in the Dog
- Haynes, Kevin H., Biskup, Jeffrey, Freeman, Andrew, Conzemius, Michael G.
- Veterinary surgery 2015 v.44 no.1 pp. 46-49
- cranial cruciate ligament, dogs, equations, femur, linear models, osteotomy, stifle
- OBJECTIVE: To evaluate the relationship between tibial plateau angle (TPA) and strain in the intact cranial cruciate ligament (CCL) during axial loading. STUDY DESIGN: Ex vivo mechanical testing study. SAMPLE POPULATION: Cadaveric canine stifles (n = 6). METHODS: 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. RESULTS: 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. CONCLUSIONS: 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.