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KNEE MENISCAL FLAP, OBLIQUE, PARROT BEAK TEAR Knee Meniscal Meniscus Flap, Oblique, Parrot Beak Tear The two menisci are crucial to the stability of the knee during movement, and to the durability of the knee over time. Tears in a meniscus will decrease the knee’s stability and increase the wear of the articular cartilage. Tears can occur because of degenerative stiffening with aging, or through abnormal isolated or repetitive movements such as due to an acute or chronic ligament tear. Meniscal tears can also occur due to an abnormally shaped or attached meniscus that doesn’t move or distribute forces effectively. Knee Meniscal Tears. Meniscal tears can be partially or completely through the meniscus, they can be single or in multiple locations, and they can have complex shapes. Longitudinal or vertical tears occur in the periphery or substance of the meniscus. They can allow the medial flap of the meniscus to slide into the joint or they can extend and allow the flap to flip into the central part of the knee joint. This is known as a bucket handle tear. Knee Meniscal Tears. A flap or oblique tear has a loose medial flap, and can occur as an acute tear, or as a progression of a longitudinal tear. They can also flip into the knee joint. Vertical tears can also be radial or transverse, or have loose tags. Horizontal or cleavage tears usually occur in the degenerate stiff meniscus. Tears may be asymptomatic, or they may cause locking, catching, giving way, pain or swelling. The outer third of the meniscus has a blood supply, so tears in this region may heal. Tears in the inner two thirds of the meniscus don’t heal, and are likely to become longer and cause worse symptoms. Knee Meniscal Tears. Over time, meniscal tears can lead to indentation of the articular surface, with fissures and erosions of the articular cartilage. This can lead to accelerated cartilage degeneration and osteo-arthritis, especially if there are also abnormal movements due to loose or torn ligaments. Knee Meniscal Tears informed ...

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