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Anterior Cruciate Ligament
From WikiSM
Contents
Description
- 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%)
Actions
- 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
Innervation
- Posterior Articular Nerve (branch of Tibial Nerve)
Clinical Significance
See Also
References
- ↑ 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.