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Reconstructing the anterolateral ligament does not decrease rotational knee laxity in ACL-reconstructed knees
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DOI：10.1007/s00167-017-4500-3.png)
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Abstract
En 中文
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. Eight human donor legs were positioned and stereoradiographically recorded at 0A degrees, 30A degrees and 60A degrees 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. After cutting the ALL in ACL-deficient knees, the internal rotation was increased in all three knee flexion angles, 0A degrees (p = 0.04), 30A degrees (p = 0.03) and 60A degrees (p < 0.01) by 1.0A degrees, 1.6A degrees and 2.5A degrees, respectively. However, no decrease in laxity was found after reconstructing the ALL in ACL-reconstructed knees. 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.
Keywords:
Knee laxity
Rotational instability
Anterolateral ligament
Anterior cruciate ligament
RSA
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