HYPOTHESIS: We hypothesized that both the AC joint capsule and CC ligaments are biomechanically robust structures in the anterior-posterior (AP) and superior-inferior (SI) planes with low loads, and that these ligaments provide essential function in AC joint stability. MATERIALS AND METHODS: Anterior-posterior (AP) and superior-inferior (SI) AC joint translations were quantified in 6 cadaver matched pairs with AC joint compressions of 10N, 20N and 30N, and with translational loads of 10N and 15N. Either the AC joint capsule or CC ligaments were transected, and measurements were then repeated. Biomechanical characteristics of the remaining AC joint capsule or CC ligaments were compared. RESULTS: There were significant increases in AP translation with the cut AC joint capsule, and significant increases in SI translation with the cut CC ligaments (P < 0.0001). Compression significantly decreased translation (P < 0.0001). DISCUSSION: Our study is supported by, and further develops, recent studies and anatomical knowledge. It offers two interpreted pieces of information for the sports medicine physician to consider for reconstruction of the AC joint. First, resection of the distal clavicle may have a detrimental effect. Second, repair of the AC joint capsule, in addition to the customarily repaired CC ligaments, appears to have a beneficial effect. CONCLUSION: The AC joint capsule is a robust anatomical structure that contributes significantly to the AC joint stability, especially in the AP plane. Compression increases stability. LEVEL OF EVIDENCE: Basic science study.
HYPOTHESIS: We hypothesized that both the AC joint capsule and CC ligaments are biomechanically robust structures in the anterior-posterior (AP) and superior-inferior (SI) planes with low loads, and that these ligaments provide essential function in AC joint stability. MATERIALS AND METHODS: Anterior-posterior (AP) and superior-inferior (SI) AC joint translations were quantified in 6 cadaver matched pairs with AC joint compressions of 10N, 20N and 30N, and with translational loads of 10N and 15N. Either the AC joint capsule or CC ligaments were transected, and measurements were then repeated. Biomechanical characteristics of the remaining AC joint capsule or CC ligaments were compared. RESULTS: There were significant increases in AP translation with the cut AC joint capsule, and significant increases in SI translation with the cut CC ligaments (P < 0.0001). Compression significantly decreased translation (P < 0.0001). DISCUSSION: Our study is supported by, and further develops, recent studies and anatomical knowledge. It offers two interpreted pieces of information for the sports medicine physician to consider for reconstruction of the AC joint. First, resection of the distal clavicle may have a detrimental effect. Second, repair of the AC joint capsule, in addition to the customarily repaired CC ligaments, appears to have a beneficial effect. CONCLUSION: The AC joint capsule is a robust anatomical structure that contributes significantly to the AC joint stability, especially in the AP plane. Compression increases stability. LEVEL OF EVIDENCE: Basic science study.
Authors: Carlo Biz; Giovanni Battista Vinanti; Marco Zamperetti; Alberto Rossato; Roberto Aldegheri Journal: Muscles Ligaments Tendons J Date: 2012-09-10
Authors: Martin Eigenschink; Philipp R Heuberer; Leo Pauzenberger; Grant E Garrigues; Leonard Achenbach; Sigbjorn Dimmen; Brenda Laky; Lior Laver Journal: Knee Surg Sports Traumatol Arthrosc Date: 2021-02-10 Impact factor: 4.342
Authors: Daichi Morikawa; Felix Dyrna; Mark P Cote; Jeremiah D Johnson; Elifho Obopilwe; Florian B Imhoff; Knut Beitzel; Augustus D Mazzocca; Bastian Scheiderer Journal: Knee Surg Sports Traumatol Arthrosc Date: 2018-10-10 Impact factor: 4.342
Authors: Sang-Jin Shin; Sean Campbell; Jonathan Scott; Michelle H McGarry; Thay Q Lee Journal: Knee Surg Sports Traumatol Arthrosc Date: 2013-07-11 Impact factor: 4.342