Review Question - QID 6216

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Femoroacetabular Impingement QID: 6216 (SAE08AN.56)

QID 6216 (Type "6216" in App Search)

Figure 33a shows a line drawing of a normal hemipelvis. The anterior acetabular rim is bold. Figure 33b illustrates a hemipelvis with a crossover sign, which is indicative of what acetabular pathology?

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Low acetabular index

29/716

Excessive acetabular retroversion

93%

664/716

Deficient anterior column bone

4/716

Labral detachment

10/716

Pelvic discontinuity

3/716

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In a normal AP pelvis radiograph, the anterior rim of the acetabulum runs medially and distally, diverging from the posterior rim which runs much more vertically. In excessive acetabular retroversion, the anterior rim (bold line in Figure 33b) and posterior rim start laterally, and as these lines progress medially and distally, the anterior line crosses the posterior line. This predisposes to femoral acetabular impingement.