Biomechanics Therapy PR
Terapéutas Atléticos enfocados en la prevención , evaluación, manejo y tratamiento de lesiones
23/11/2022
Coracoclavicular (CC) Ligament 🤓
👉 The coracoclavicular ligament comprises 2 stout ligaments (conoid and trapezoid) that span from the base of the superior coracoid to the undersurface of the clavicle (s. figure, https://link.springer.com/chapter/10.1007/978-3-030-23029-6_1)
👉 The trapezoid ligament is oriented from its origin on the coracoid in a superior, anterior, and lateral direction to its insertion on the clavicle. The trapezoid ligament has a broad insertion into the trapezoid line at the undersurface of the clavicle.
👉 The conoid origin is posterior and medial to the trapezoid from the coracoid angle and is oriented superiorly and medially toward its clavicular attachment. The conoid ligament inserts at a boney prominence on the undersurface of the clavicle posterior to the midline termed the conoid tubercle.
https://www.sciencedirect.com/science/article/pii/S1060187214000276
👉 The conoid and trapezoid function differently in resisting applied loads, depending on the direction of the applied load. After transection of the AC joint capsule, the conoid served as the primary restraint against anterior and superior loading, while the trapezoid functioned as the primary restraint against posterior loading. The relative orientation of these two ligaments has been suggested to account for their different functions. https://pubmed.ncbi.nlm.nih.gov/3949839/,
👉 The AC joint capsule is quite thin, but has considerable ligamentous support; there are four AC ligaments: superior, inferior, anterior and posterior. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4295671/, https://pubmed.ncbi.nlm.nih.gov/3618870/, https://pubmed.ncbi.nlm.nih.gov/10983707/, https://pubmed.ncbi.nlm.nih.gov/20810076/
👉 Dawson et al. showed that the AC ligaments offer three times more stability in the anteroposterior plane than in the supero inferior plane. https://pubmed.ncbi.nlm.nih.gov/19111475/
👉 This finding agrees with the generally accepted principle that horizontal stability is mediated by the AC ligaments while vertical stability is mediated by the CC ligaments. https://pubmed.ncbi.nlm.nih.gov/25606549/.
👉 Load-to-failure test results confirmed that the conoid ligament fails first when a load is applied to the CC complex in a superior direction. https://pubmed.ncbi.nlm.nih.gov/14507296/, https://pubmed.ncbi.nlm.nih.gov/18375786/) The most common site of rupture was the midsubstance region, followed by rupture about the origin (https://pubmed.ncbi.nlm.nih.gov/12825527/, https://pubmed.ncbi.nlm.nih.gov/15572323/).
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09/12/2024