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Leg length discrepancy
2%
138/5543
Pelvic ring instability
59%
3258/5543
Femoroacetabular impingement
106/5543
Hip abductor weakness
32%
1792/5543
Lumbosacral instability
4%
222/5543
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Alternating single-leg-stance radiographs are used for the diagnosis of chronic or subtle pelvic instability. Pelvic instability is a rare etiology of lumbar and low-back discomfort; patients report subjective instability and mechanical symptoms. Static radiographs (AP pelvis, inlet pelvis, outlet pelvis) are often not adequate for diagnosis of this condition. Garras et al. performed a study of healthy volunteers and reported on the normal range of physiologic motion with single leg stance radiographs. They found that multiparous women exhibited the most symphyseal motion with alternating single leg stance weightbearing AP pelvic radiographs, and up to 5mm of symphyseal translation was seen in healthy, asymptomatic patients. Siegel et al. reviewed 38 patients with pelvic instability and pain. They found that single leg stance radiographs were more indicative of instability than standard AP pelvis and inlet/outlet radiographs. They found that up to 5 cm of sympyhseal translation can be present with these injuries. Illustration A shows a single leg stance (left leg) AP pelvis radiograph with cephalad displacement of the left hemipelvis. Illustration B shows a single leg stance (right leg) AP pelvis radiograph, with cephalad displacement of the right hemipelvis. Incorrect Answers: Answer 1,3,4,5: Standing alternating single-leg-stance radiographs are not used for diagnosis or evaluation of these disorders.
2.6
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