Digital subtraction arthrography

This method uses digital subtraction techni­ques taken from the field of angiography, and requires expensive specialized equipment. It involves injection of contrast into the joint, while keeping the arm still, and taking images at 1 second intervals. The images are then sub­tracted by a computer from a mask image without contrast, in order to obtain bone-free images. Enthusiasts claim that it is more sensi­tive in detecting full thickness and deep surface tears, and can show the site and size of a tear more accurately than the conventional techni­que. It can also be used to evaluate shoulder replacements for loosening. It is technically more difficult than conventional arthrography, and has not found wide application.


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