From the case: ACL tear

MRI
ABSENT ACL, THIS ...
Sagittal PD
ABSENT ACL, THIS IS PRIMARY SIGN, IT SHOULD NORMALLY BE PARALLEL TO BLUMENSAAT LINE WHICH REPRESENTS ROOF OF INTERCONDYLAR NOTCH
System: Musculoskeletal
Modality: MRI (PD)

- “ The primary sign is non visualization of the intact ligament, secondary signs help when confirmation is required. The most useful secondary signs...”

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