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To the Editor: Despite the numerous morphological and biomechanical studies on the anterior cruciate ligament (ACL), this anatomical structure is still under investigation; in particular, there is a discussion about its anatomical composition in relation to biomechanics. At present, in general, it is assumed that ACL comprises a structure of two bundles: anteromedial and posterolateral. Sometimes, even three bundles are distinguished; however, the presumption that ACL is an integral and continuous structure is constantly mentioned in the literature. It is known that ACL is not isometric, and the length of ACL fibers varies along with knee flexion and extension: in flexion, the length of anteromedial bundle increases (tightens), while posterolateral bundle decreases (slackens). At the same time, during knee flexion and extension, femoral part of ACL rotates, while its tibial part moves minutely.[1] It might be considered that the foreign body embedded at the distal part of ACL should have less potency for migration.

Tibial Part of Anterior Cruciate Ligament