The posteromedial bundle of the PCL is the smaller bundle, taut in extension. Runs from the posteromedial femoral attachment to the posteromedial tibial insertion.
Restrains posterior tibial translation near extension (0-30 degrees) and contributes to rotational stability in extension.
PMB tears occur in combined ligament injuries. Double-bundle PCL reconstruction targeting both ALB and PMB provides more comprehensive stability.
Posteromedial bundle disruption in multi-ligament knee injury requiring double-bundle reconstruction for full stability restoration.
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