Kasper Stentz-Olesen1, Emil Toft Nielsen2, Sepp de Raedt3,4, Peter Bo Jørgensen3, Ole Gade Sørensen3, Bart Kaptein5, Kjeld Søballe3, Maiken Stilling3,6. 1. Orthopedic Research Unit, Aarhus University Hospital, Tage Hansens Gade 2, 8000, Aarhus C, Denmark. kasperstentz@gmail.com. 2. Department of Health Science and Technology, Aalborg University, Fredrik Bajers Vej 7 D2, 9220, Aalborg East, Denmark. 3. Orthopedic Research Unit, Aarhus University Hospital, Tage Hansens Gade 2, 8000, Aarhus C, Denmark. 4. Nordisk Røntgen Teknik, Birkegaardsvej 16, 8361, Hasselager, Denmark. 5. Biomechanics and Imaging Group, Department of Orthopedic Surgery, Leiden University Medical Center, Albinusdreef 2, 2333, ZA Leiden, The Netherlands. 6. Department of Clinical Medicine, University of Aarhus, Aarhus C, Denmark.
Abstract
PURPOSE: Little is known about the anterolateral ligament's (ALL) influence on knee laxity. The purpose of this study was to investigate rotational knee laxity against a pure axial rotational stress using radiostereometric analysis (RSA) after cutting and reconstructing both the anterior cruciate ligament (ACL) and the ALL. METHODS: Eight human donor legs were positioned and stereoradiographically recorded at 0°, 30° and 60° of knee flexion using a motorised fixture, while an internally rotating force of 4 Nm was applied to the foot. Anterior-posterior and rotational laxity were investigated for knees with intact ligaments and compared with those observed after successive ACL and ALL resection and reconstruction. RESULTS: After cutting the ALL in ACL-deficient knees, the internal rotation was increased in all three knee flexion angles, 0° (p = 0.04), 30° (p = 0.03) and 60° (p < 0.01) by 1.0°, 1.6° and 2.5°, respectively. However, no decrease in laxity was found after reconstructing the ALL in ACL-reconstructed knees. CONCLUSIONS: The ALL was confirmed as a stabiliser of internal rotation in ACL-deficient knees. However, reconstructing the ALL using a gracilis autograft tendon did not decrease the internal rotation laxity in the ACL-reconstructed knee. Based on the results of this study, we do not recommend reconstructing the ALL in ACL-reconstructed knees to decrease internal knee laxity.
PURPOSE: Little is known about the anterolateral ligament's (ALL) influence on knee laxity. The purpose of this study was to investigate rotational knee laxity against a pure axial rotational stress using radiostereometric analysis (RSA) after cutting and reconstructing both the anterior cruciate ligament (ACL) and the ALL. METHODS: Eight humandonor legs were positioned and stereoradiographically recorded at 0°, 30° and 60° of knee flexion using a motorised fixture, while an internally rotating force of 4 Nm was applied to the foot. Anterior-posterior and rotational laxity were investigated for knees with intact ligaments and compared with those observed after successive ACL and ALL resection and reconstruction. RESULTS: After cutting the ALL in ACL-deficient knees, the internal rotation was increased in all three knee flexion angles, 0° (p = 0.04), 30° (p = 0.03) and 60° (p < 0.01) by 1.0°, 1.6° and 2.5°, respectively. However, no decrease in laxity was found after reconstructing the ALL in ACL-reconstructed knees. CONCLUSIONS: The ALL was confirmed as a stabiliser of internal rotation in ACL-deficient knees. However, reconstructing the ALL using a gracilis autograft tendon did not decrease the internal rotation laxity in the ACL-reconstructed knee. Based on the results of this study, we do not recommend reconstructing the ALL in ACL-reconstructed knees to decrease internal knee laxity.
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