A Settegast is a standard medical

x-ray An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30&nb ...

projection that presents a tangential view of the

patella The patella, also known as the kneecap, is a flat, rounded triangular bone which articulates with the femur (thigh bone) and covers and protects the anterior articular surface of the knee joint. The patella is found in many tetrapods, such as m ...

. To acquire such an image the patient is placed in a prone position with the

knee In humans and other primates, the knee joins the thigh with the leg and consists of two joints: one between the femur and tibia (tibiofemoral joint), and one between the femur and patella (patellofemoral joint). It is the largest joint in the hu ...

flexed at least 90 degrees and the field of view centered on the patellofemoral joint space.

References

* Kenneth L. Bontrager and John P. Lampignano ''Bontrager's Handbook of Radiographic Positioning and Techniques.'' Elsevier Health Sciences, 2013 {{Treatment-stub X-rays