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Pelvic instability Illustrates both the importance of radiographic technique and the significance of muscle as a dynamic stabiliser of joint. Flamingo stress views of the symphysis pubis performed to evaluate for underlying pelvic instability. Top images show initial attempt -a very horizontal pelvis orientation in both views but pt told to hang her non-weight bearing leg but keep the pelvis square.
As this technique necessarily recruits the dynamic stabilisers of the pelvis and will confound the assessment of passive ligamentous integrity, radiographer repeat (bottom images) with all muscles on the hanging side switched off - vertical shift at the symphysis on the first two images was within normal limits at 1.2 mm, but on the 2nd two images measured 3.3 mm and was consistent with instability.