- ACL Function
- Provides 85% of the stability to prevent anterior translation of the tibia relative to the femur.
- Acts as secondary restraint to tibial rotation and varus/valgus rotation.
- ACL Anatomy
- 33mm x 11mm in size.
- Goes from Lateral femoral condyle to anterior tibia (Tibial insertion is broad and irregular and inserts just anterior and between the intercondylar eminences of the tibia).
- Two bundles
- Anteromedial bundle
- More isometric
- Tight in flexion
- Posterolateral bundle
- Tightest in extension (where it likely contributes greatest to rotational stability)
- ACL Blood supply
- Mainly from Middle geniculate artery
- ACL Innervation
- Posterior articular nerve (branch of tibial nerve)
- ACL Composition
- 90% Type I collagen
- 10% Type III collagen
- ACL Strength: 2200 N (anterior)
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