★ Surgical anatomical structures related to the ACL ★
1️⃣ Lateral Intercondylar Ridge:
- This structure is found anterior to the ACL femoral footprint, with an average length of 18.0 mm.
- It stretches from the femoral articular cartilage margin to the roof of the intercondylar notch.
2️⃣ Lateral Bifurcate Ridge:
- Situated between the AM (anteromedial) and PL (posterolateral) bundles of the ACL, this ridge runs relatively perpendicular to the lateral intercondylar ridge.
- It extends from the lateral intercondylar ridge to the posterior articular cartilage margin, with an average length of 11.6 mm.
- It separates the AM and PL bundles at their femoral attachments, aligning superior to inferior in a knee flexed at approximately 90°, which translates to an anterior-to-posterior direction when the knee is extended.
★ ACL ★
- A normal ACL presents a striated appearance and runs parallel to Blumensaat’s line, which marks the roof of the intercondylar notch.
- The ACL attaches on the inner (medial) side of the posterolateral femoral condyle.
- In an extended knee position, the AM bundle fibers originate anteriorly and proximally, while the PL bundle comes from the posterolateral side.
- On sagittal images, the two bundles of the ACL are not distinctly separable, with the anterior margin possibly appearing darker and thicker, indicative of the AMB (anteromedial bundle).
- The PL bundle may display higher signal intensity compared to the AM bundle.
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(Fig 2-A.07) Normal ACL on oblique coronal images (0) | 2024.02.16 |
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(Fig 2-A.06) Normal ACL on axial images (0) | 2024.02.16 |
(Fig 2-A.04) Normal ACL on coronal images, anteromedial and posterolateral bundles of ACL (0) | 2024.02.16 |
(Fig 2-A.03) Normal ACL on Sagittal images (0) | 2024.02.16 |
(Fig 2-A.02) Tibial attachment of the ACL, ACL footprint (0) | 2024.02.16 |