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)
