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Posterior Cruciate Ligament
From WikiSM
Description
- 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
- Anterolateral bundle (ALB)
- General
- Largest, strongest intra-articular ligament of the knee joint
- ALB and PMB have codominant relationship
Actions
- 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
Innervation
Clinical Significance
See Also
- ↑ 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.