PMC9979938_01
POCUS protocol. A high-frequency linear transducer (8-13 MHz) was placed transversely on the pelvis to scan the area from the iliac crest to the ischium.
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TM e (GE Healthcare, Japan) with a high-frequency linear transducer (8-13 MHz). The patient was placed in a supine position, and a transducer was placed transversely and longitudinally from the iliac crest to the ischium (Figure 1).
POCUS findings (ASIS view). Transverse (A) and longitudinal view (B) of the ASIS showed two hyperechoic structures with acoustic shadows. POCUS visualized ASIS as an uneven structure (indicated by the arrow), and the apophysis as a curved structure (indicated by the arrow head). The apophysis normally overlies the ASIS when not displaced.
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POCUS normally allows visualization of the ASIS and its apophysis as hyperechoic structures with an acoustic shadow, with the apophysis overlying the ASIS (Figure 2).
POCUS findings (ASIS view). Transverse (A) and longitudinal view (B) of the ASIS showed two hyperechoic structures with acoustic shadows. The uneven structure is the ASIS (arrow), and the curved structure is the apophysis (arrow head). In the present patient, the apophysis was anterolaterally displaced.
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In the present patient, the apophysis appeared hyperechoic with an acoustic shadow on the anterolateral side of the ASIS with an anterior and lateral displacement of 3.6 mm and 3.8 mm, respectively, suggesting an ASIS avulsion fracture (Figure 3).
X-ray of the pelvis. A slightly displaced radiopaque structure was detected on the lateral side of the ASIS, suggesting an ASIS avulsion fracture (arrow).
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X-ray of the pelvis confirmed the diagnosis of ASIS avulsion fracture (Figure 4).