ArticleFoot & ankle international2026
The Superior Fascicle of the Anterior Talofibular Ligament Functions as a Restraint Against Internal Rotation: A Cadaveric Biomechanical Study.
Article in Foot & ankle international, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors.
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Abstract
backgroundLateral ankle sprains frequently result in anterior talofibular ligament (ATFL) dysfunction, leading to chronic lateral ankle instability. The ATFL consists of superior and inferior fascicles; however, the stabilizing role of the superior fascicle remains unclear. We biomechanically evaluated its function using cadaveric models.
methodsNine frozen cadaveric ankles were tested using a robotic system (FRS2015). The superior fascicle was sequentially transected arthroscopically to simulate cumulative 3 injury types: type 1, partial detachment at the medial margin of the fibular attachment; type 2, proximal detachment; and type 3, complete detachment. Anterior talar translation, internal rotation, and inversion angles relative to the tibia were measured as displacements under the anterior drawer, internal rotation, and inversion loads, respectively, at 15° dorsiflexion and 15° and 30° plantarflexion. In situ forces and ankle kinematics were also measured.
resultsInternal rotation displacement at 30° plantarflexion was significantly greater in type 3 than in the intact (mean difference, 2.9°; 95% CI, 0.6°-5.0°;
conclusionPartial injury to the superior fascicle of the ATFL was not associated with a statistically significant difference in ankle instability under the tested conditions, whereas complete injury was associated with significantly greater internal rotational displacement. CLINICAL RELEVANCE: Injury to the superior fascicle of the ATFL is associated with increased internal rotational laxity, supporting the use of internal rotation testing, such as the anterolateral drawer test, when evaluating suspected ATFL injury.
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