Instrumented Analysis of Ankle-Subtalar Joint Complex Motion at Different Flexion Angles for Lateral Ligament Injuries

Kovaleski, John E.; Hollis, M; Heitman, Robert J.; Norrell, Phillip M.; Pearsall, Albert W.

doi:10.1097/00005768-200405001-00732

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“…12,21,25,28 To measure the stiffness of the ankle complex, these data were plotted as the applied load versus the displacement over the endrange of loading (50 to 100 N). Stiffness was defined as force per displacement (N/mm) and was calculated by dividing 50 N (load difference between 50 N and 100 N) by the anterior displacement between the 50 N and 100 N [29][30][31] Separate 2 3 2 repeated-measures analyses of variance were used to determine the effect of knee and ankle position on ankle complex laxity and stiffness. Statistical significance was set at .05.…”

Section: Data Reduction and Statistical Analysismentioning

confidence: 99%

Knee and Ankle Position, Anterior Drawer Laxity, and Stiffness of the Ankle Complex

Kovaleski

Norrell

Heitman

et al. 2008

Journal of Athletic Training

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Context: Anterior drawer testing of the ankle is commonly used to diagnose lateral ligamentous instability. Our hypothesis was that changing knee and ankle positions would change the stability of the ankle complex during anterior drawer testing.Objectives: To assess the effects of knee and ankle position on anterior drawer laxity and stiffness of the ankle complex.Design: A repeated-measures design with knee and ankle position as independent variables.Setting: University research laboratory.Patients or Other Participants: Bilateral ankles of 10 female (age 5 19.8 6 1.1 years) and 10 male (age 5 20.8 6 1.2 years) collegiate athletes were tested.Intervention ( Results: Anterior laxity of the ankle complex was maximal with the knee positioned at 906 of flexion and the ankle at 106 of PF when compared with the knee positioned at 06 of flexion and the ankle at 106 or 06 of PF (P , .001), whereas ankle complex stiffness was greatest with the knee positioned at 06 of flexion and the ankle at 06 of PF (P , .009).Conclusions: Anterior drawer testing of the ankle complex with the knee positioned at 906 of flexion and the ankle at 106 of PF produced the most laxity and the least stiffness. These findings indicate that anterior drawer testing with the knee at 906 of flexion and the ankle at 106 of PF may permit better isolation of the ankle capsuloligamentous structures.Key Words: lateral ankle sprains, physical examination Key PointsN Differences in ankle laxity and stiffness during anterior drawer loading of the ankle complex were found in various knee and ankle positions.N Alterations in the passive tension characteristics acting through the Achilles tendon complex and the ankle capsuloligamentous structures should be considered when assessing ankle ligament laxity.

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