In Vivo Kinematics of the Tibiotalar Joint After Lateral Ankle Instability
Background Previous studies have suggested that injury to the anterior talofibular ligament (ATFL) may be linked to altered kinematics and the development of osteoarthritis of the ankle joint. However, the effects of ATFL injury on the in vivo kinematics of the ankle joint are unclear. Hypothesis Ba...
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Veröffentlicht in: | The American journal of sports medicine 2009-11, Vol.37 (11), p.2241-2248 |
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Zusammenfassung: | Background Previous studies have suggested that injury to the anterior talofibular ligament (ATFL) may be linked to altered kinematics
and the development of osteoarthritis of the ankle joint. However, the effects of ATFL injury on the in vivo kinematics of
the ankle joint are unclear.
Hypothesis Based on the orientation of the ATFL fibers, ATFL deficiency leads to increased anterior translation and increased internal
rotation of the talus relative to the tibia.
Study Design Descriptive laboratory study.
Methods The ankles of 9 patients with unilateral ATFL injuries were compared as they stepped onto a level surface. Kinematic measurements
were made as a function of increasing load. With use of magnetic resonance imaging and orthogonal fluoroscopy, the in vivo
kinematics of the tibiotalar joint were measured in the ATFL-deficient and intact ankles of the same individuals.
Results A statistically significant increase in internal rotation, anterior translation, and superior translation of the talus was
measured in ATFL-deficient ankles, as compared with the intact contralateral controls. For example, at 100% body weight, ATFL-deficient
ankles demonstrated an increase of 0.9 ± 0.5 mm in anterior translation ( P = .008), an increase of 5.7° ± 3.6° in internal rotation ( P = .008), and a slight increase of 0.2 ± 0.2 mm in the superior translation ( P = .02) relative to the intact contralateral ankles.
Conclusion Deficiency of the ATFL increases anterior translation, internal rotation, and superior translation of the talus.
Clinical Relevance Altered kinematics may contribute to the degenerative changes observed with chronic lateral ankle instability. These findings
might help to explain the degenerative changes frequently observed on the medial talus in patients with chronic ATFL insufficiency
and so provide a baseline for improving ankle ligament reconstructions aimed at restoring normal joint motion. |
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ISSN: | 0363-5465 1552-3365 |
DOI: | 10.1177/0363546509337578 |