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A Settegast is a standard medical x-ray projection that presents a tangential view of the patella. To acquire such an image the patient is placed in a prone position with the knee flexed at least 90 degrees and the field of view centered on the patellofemoral joint space.
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
International Knee Documentation Committee (IKDC) system [10] Grade Findings A No joint space narrowing, defined in this system as at least 4 mm joint space B At least 4 mm joint space, but small osteophytes, slight sclerosis, or femoral condyle flattening C 2–4 mm joint space D < 2 mm joint space
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
Radiography is an imaging technique using X-rays, gamma rays, or similar ionizing radiation and non-ionizing radiation to view the internal form of an object.Applications of radiography include medical ("diagnostic" radiography and "therapeutic radiography") and industrial radiography.
Front X-ray of right knee of an adolescent (epiphyseal plates are open): arrows point to avascular necrosis and developing osteochondritis dissecans in the outer medial condyle of femur. In the early stages, bone scintigraphy and MRI are the preferred diagnostic tools. [18] [19] X-ray images of avascular necrosis in the early stages usually ...
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 ]
Lateral view. It shows the following measurements used for post-operative evaluation : Anterior femoral notching (the femoral component causing reduced thickness of the distal femur anteriorly), which seems to cause an increased risk of fractures when exceeding about 3 mm. Reference: