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Anterior Cruciate Ligament

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  • Tibial insertion: anteromedial aspect of the intercondylar region of the Tibial Plateau
    • Anterior tibia, between intercondylar eminences
  • Femoral insertion: posteromedially to attach to the lateral Femoral Condyle
    • Lateral intercondylar ridge demarcates the anterior border of the ACL
    • Bifurcate ridge separates the anteromedial and posterolateral bundle attachment
  • Anteromedial (AM) bundle
    • Nearly isometric, with a tendency toward slightly more tension during flexion than in extension
    • Considered the center of ACL rotation[1]
    • Provide both rotational, translational (sagittal plane) stability
  • Posterolateral (PL) bundle
    • Lax in flexion, becomes taught during the end range of extension (from 15° of flexion to 0°)
    • Provides primarily more rotational stability.
  • Histology
    • Composed of connective tissue, collagenous fibers
    • Type I collagen (90%), Type II collagen (10%)


  • Aids in stabilization of the knee joint
    • Prevents excess forward translation of the tibia relative to the femur during flexion and extension
    • Rotational stability to the knee with varus or valgus stress
    • 2200 N strength (anterior)

Vascular Supply

  • Middle Geniculate Artery


Clinical Significance

See Also


  1. Sonnery-Cottet B, Chambat P. Arthroscopic identification of the anterior cruciate ligament posterolateral bundle: The figure-of-four position. Arthroscopy. 2007;23:1128.e1–3.
Created by:
John Kiel on 19 November 2020 07:05:53
Last edited:
21 November 2020 20:53:35