Type of Document Master's Thesis Author Johnson, Kelly Ann URN etd-04302010-144750 Title The Effect of Stifle Angle on Stifle Kinematics following TPLO: An in vitro Experimental Analysis Degree Master of Science Department Veterinary Medical Sciences Advisory Committee
Advisor Name Title Lanz, Otto I. Committee Chair Harper, Tisha A. Committee Member McLaughlin, Ronald Committee Member Keywords
- Internal rotation
- Cranial tibial translation
- Tibial plateau leveling osteotomy
Date of Defense 2010-04-19 Availability unrestricted AbstractObjective: To determine the ability of the Tibial Plateau Leveling Osteotomy (TPLO) to restore normal joint kinematics in a cranial cruciate ligament (CrCL)-deficient stifle through a loaded range of motion.
Methods: Paired pelvic limbs from 12 dogs were compared in an in vitro biomechanical study. Each limb was placed in a custom designed jig at 120° of stifle extension under an axial load of 20% body weight. Electromagnetic motion tracking sensors were placed on the distal femur and proximal tibia. A force was applied at approximately 10 N/sec to mimic the action of the quadriceps muscle. Force application allowed the limb to move from 120° to maximal extension. Positional data was acquired at 60 points/second. Each limb was tested under normal, CrCL-deficient, and TPLO-treated conditions.
Results: The TPLO failed to normalize CTT within the CrCL-deficient stifle; however, values trended towards intact values throughout the range of motion. No significant differences were noted in internal rotation in any of the three conditions from 120° – 137°. Hyperextension values did not differ significantly between conditions.
Conclusion: Data from this biomechanical model suggests that the TPLO fails to neutralize CTT throughout a loaded range of motion. Internal rotation and hyperextension values were not found to differ significantly between intact, CrCL-deficient and TPLO repaired stifles. The effectiveness of the TPLO in restoring normal biomechanics is more significant at greater angles of flexion.
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