Anterior cruciate ligament tear:
- abnormal orientation, disruption and discontinuity of the anterior cruciate ligament (ACL) fibres (red arrows)
- focal fluid visible between the anterior cruciate ligament and the lateral femoral condyle in the intercondylar notch also referred to as the empty notch sign (red arrowhead)
- bone contusions at the condylopatellar sulcus also known as deep lateral femoral notch sign (orange arrow) and at the posteromedial and posterolateral tibial Plateau (orange arrowheads) as an expression of a pivot-shift injury
Associated injuries:
- tearing of the anterior part of the joint capsule and the femoral portion of the medial meniscocapsular ligament (blue arrow)
- tearing of the posterior oblique ligament (blue arrowhead)
- sprain of the tibial semimembranosus tendon insertion (purple arrowhead)
- a small longitudinal meniscal tear of the posterolateral border of the lateral meniscus at the insertion of the posterosuperior meniscopopliteal fascicle (purple arrow)