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. 2013 Oct 4;74(1):196–203. doi: 10.1136/annrheumdis-2013-203972

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This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 3.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/3.0/

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Vascular channels posterior to the site of the anterior cruciate ligament (ACL) tibial insertion: (A–B) sagittal intermediate-weighted turbo spin-echo MR images of normal cadaveric tissue samples. (A) The vascular channel is seen as a thin high signal line penetrating the bone cortex (arrows) anterior to the tibial spines (TS). (B) Bone marrow oedema observed at the expected location of the vascular channel (arrows). (C) Corresponding sagittal histological section of the same cadaveric sample shown in A, showing a vascular channel (arrows) penetrating the bone cortex into the marrow space. These vascular channels are conduits for vascular penetration through the bone cortex. (D) Sagittal histological section showing blood vessels (arrow) in a vascular channel posterior to the ACL insertion. Vascular channel immediately anterior to the tibial insertion of the posterior cruciate ligament (PCL): (E) Sagittal fluid-sensitive MRI image showing high signal region corresponding to vascular channel (arrow) in age normal cadaveric tissue. (F) Corresponding sagittal histological section of the same cadaveric sample in E, shows a vascularised channel (arrow) with its origin immediately anterior to the tibial insertion of the PCL, extending anteriorly into the subchondral bone. Scale bars; C=5 mm, D and F=1 mm.