The vertical flap tear is a displaced type of radial tear that often occurs in the posterior medial meniscus. It presents as a wedge-shaped defect resembling a parrot beak at the free edge of the meniscus as a result of displaced oblique vertical orientation.
Has both vertical and horizontal components occurring at the free edge of the meniscus body, usually at the junction of the body and posterior horn of lateral meniscus, better seen in the coronal projection. One might describe a parrot beak as a compound oblique radial tear.
As parrot beak tears are essentially defined by a displaced fragment, the tear is typically unstable. They are addressed through arthroscopy; however, given that the tear involves the inner portion of the meniscus, it is not usually amenable to repair and is treated with partial meniscectomy.
Parrot beak tears start as radial tears and propagate as compound oblique vertical tears. They are seen as
Image 2 arrow demonstrates a radial defect in the lateral meniscus body. The tear is seen as blunting
Image 1 - Coronal T2 Image 2 - Sagittal PD Fat Sat
Image 3 - Axial PD