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Knee pain after sitting for a while

Discussion in 'Concerns after knee surgery' started by Josephine, Jan 28, 2011.

  1. Josephine

    Josephine Administrator

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    This is known as the movie sign (pain in the knee with a prolonged period of sitting such as when going to the movies)

    There are two leading theories for the movie sign.

    1. while sitting we predispose our knee to change normal position so structures can impinge on a swollen and inflamed synovial lining

    2. as we sit the knee's intra articular pressure increases, resulting in pain

    Studies have shown that the knee is an extremely fibrotic and capsular entity, meaning it is contained in a tough, fibrous bag. When put in prolonged flexion we may impede venous outflow and increase arterial blood flow in to and away from the knee. This change in blood flow can increase the pressure within the joint as we sit.

    (The complexity and fullness of blood supply to the knee can be seen in this image)


    [​IMG]
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