We need you! See something you could improve? Make an edit and help improve WikSM for everyone.

Posterior Cruciate Ligament

From WikiSM
Jump to: navigation, search


  • Anatomic description
    • Anterolateral bundle (ALB)
      • Makes up around 65% of the substance of the PCL and is tight in flexion.
      • Femoral attachment larger than tibial attachment
      • Ranges from 112-118 mm2
    • Posteromedial bundles (PMB)
      • Makes up the other 35% of the PCL and is tight in extension.
      • Ranges from 60-90 mm2
  • General
    • Largest, strongest intra-articular ligament of the knee joint
    • ALB and PMB have codominant relationship


  • Primary Function
    • Prevent posterior displacement or translation of the tibia on the femur at all flexion angles
    • ALB: main resistant to posterior tibial translation between 70° and 105°
    • PMB: main resistant between 0° and 15°
    • Primary restraint for internal rotation beyond 90°[1]
  • Secondary function
    • Limits varus and valgus stress
    • Assists in proprioception
    • Screw home mechanism
    • Supplemental restraint to external tibial rotation beyond 90° of flexion

Vascular Supply

  • Middle Geniculate Artery


Clinical Significance

See Also

  1. Kennedy NI, Wijdicks CA, Goldsmith MT, Michalski MP, Devitt BM, Årøen A, et al. Kinematic analysis of the posterior cruciate ligament, part 1: the individual and collective function of the anterolateral and posteromedial bundles. Am J Sports Med. 2013;41(12):e2828–38.
Created by:
John Kiel on 9 July 2019 02:04:53
Last edited:
29 November 2020 15:20:48