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The Ottawa knee rules are a set of rules used to help physicians determine whether an x-ray of the knee is needed. [1] They state that an X-ray is required only in patients who have an acute knee injury with one or more of the following: Age 55 years or older; Tenderness at head of fibula; Isolated tenderness of patella
Exostosis of inferior humerus and/or glenoid measuring 3–7 mm, and slight irregularity of the joint Severe Exostosis of inferior humerus and/or glenoid measuring more than 7 mm in height as well as sclerosis and narrowing of the joint space (normal joint space is 4–5 mm).
Fairbank's changes describe the radiological changes observed on an AP radiograph of the knee after meniscectomy. [1] Fairbank identified significant changes including squaring of the femoral condyles, peak eminences, ridging, and joint space narrowing. [2] [3]
However, from a practical point of view, false positives that lead to negative X-ray tests were the very thing that the knee rules are trying to address. Nonetheless, the Pittsburgh knee rules offer fewer false positives than do the Ottawa knee rules , though the Ottawa knee rules are more commonly used. [ 2 ]
A PACS consists of four major components: The imaging modalities such as X-ray plain film (PF), computed tomography (CT) and magnetic resonance imaging (MRI), a secured network for the transmission of patient information, workstations for interpreting and reviewing images, and archives for the storage and retrieval of images and reports.
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The knee bursae are the fluid-filled sacs and synovial pockets that surround and sometimes communicate with the knee joint cavity. The bursae are thin-walled, and filled with synovial fluid . They represent the weak point of the joint, but also provide enlargements to the joint space. [ 1 ]
The most common knee problems are: soft tissue inflammation, injury, or osteoarthritis. The mechanism of the knee injury can give a clue of the possible structures that can be injured. For example, applying valgus stress on the knee can cause medial collateral ligament rupture, meanwhile a varus force can cause lateral collateral ligament rupture