ArticleArthroscopy, sports medicine, and rehabilitation2021
Clavicular-Sided Tears Were the Most Frequent Mode of Failure During Biomechanical Analysis of Acromioclavicular Ligament Complex Failure During Adduction of the Scapula.
Article in Arthroscopy, sports medicine, and rehabilitation, 2021. 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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Abstract
purposeThe purpose of this study was to describe the force and failure pattern of the acromioclavicular ligament complex (ACLC) in an adducted scapula, potentially simulating an indirect force injury of the AC joint. By using a biomechanical simulation in which the scapula is moved and the clavicle is fixed, we are able to better replicate the in vivo motion of the joint.
methodsTen cadaveric shoulders (mean age of 62.0 ± 8.6) with a bone mineral density of .51 ± .18 g/cm
resultsThe mean torque required for load to failure was found to be 27.75 N-m (95% CI [20.85 N-m, 34.65 N-m]). The mean rotary angle at failure was 30° (95% CI [25°, 35°]). The mean stiffness (resistance provided by the ACLC) was 1.64 N-m/° (95% CI [1.28 N-m/°, 2.01 N-m/°]. Mode of failure analysis showed there were 6 clavicle-sided tears, 1 acromion-sided tear, 2 acromion fractures, and 1 clavicle fracture.
conclusionsClavicular side tears were the most frequent mode of failure compared to midline and acromion side tears. The first segment of the ACLC to fail most frequently during adduction was the posterosuperior ligament. CLINICAL RELEVANCE: This biomechanical study simulates a potential mechanism of AC ligament injury. Additional knowledge about the mode of failure provides a better understanding of the ACLC, allowing for new information for the purpose of AC ligament reconstruction.
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