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Original Article

Validation of an optical, computer-assisted technique for intraoperative tracking of 3-dimensional canine stifle joint motion

Cecilia Signorelli,Filippo Cinti,Stefano Zaffagnini,Nicola Francesco Lopomo.


Background: Cranial cruciate ligament (CCL) rupture is the most common orthopedic pathology in dog and in men. In human, optical computer-assisted technique is considered a repeatable and reliable method for the biomechanical assessment of joint kinematics and laxity in case of CCL surgery.
Objectives: To evaluate the repeatability and reliability afforded by clinical tests in terms of laxity measured by means of a computer-assisted tracking system in two canine CCL conditions: CCL-Intact, CCL-Deficient.
Methods: Fourteen fresh frozen canine stifles were passively subjected to Internal/External (IE) rotation at 120° of flexion and Cranial drawer test (CC). To quantify the repeatability and the reliability, Intraclass Correlation Coefficient (ICC) and the mean percent error were evaluated (Δ %).
Results: The study showed a very good intra-class correlation, before and after CCL resection for kinematics tests. It was found a minimum ICC=0.73 during the IE rotation in CCL-Intact and a maximum value of ICC=0.97 for the CC displacement in CC-Deficient. IE rotation with CCL-Intact is the condition with the greatest Δ %=14% while the lowest Δ %=6% was obtained for CC displacement in CCL-Deficient.
Conclusion: The presented work underlined the possibility of using a computer-assisted method also for biomechanical studies concerning stifle kinematics and laxity.

Key words: Optical system, computed –assisted technique, cranial cruciate ligament, stifle joint, Dog

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