Anterior inferior iliac spine avulsion injury
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Anterior inferior iliac spine (AIIS) avulsion injuries are one of the six main types of pelvic apophyseal avulsion fractures. Subacute or chronic avulsion injuries can be mistaken for a pseudotumour.
Epidemiology
As with many pelvic avulsion injuries, they most often occur in adolescents (mostly between the ages 14-17). There is a slight male predilection and they tend to occur most often in sports involving kicking.
Pathology
The straight head of the rectus femoris muscle originates from the AIIS and forceful extension at the hip joint can lead to an avulsion injury at this point. The mechanism is one of forced hip extension with the knee in flexion 4.
Radiographic features
Plain radiograph
The avulsed bony fragment may not be as obvious on the AP radiograph as on oblique projections.
Treatment and prognosis
Almost all cases are managed conservatively.
-<p><strong>Anterior inferior iliac spine (AIIS) avulsion injuries</strong> are one of the six main types of <a href="/articles/apophyseal-avulsion-fractures-of-the-pelvis-and-hip">pelvic apophyseal avulsion fractures</a>. </p><h4>Epidemiology</h4><p>As with many pelvic avulsion injuries, they most often occur in adolescents (mostly between the ages 14-17). There is a slight male predilection and they tend to occur most often in sports involving kicking.</p><h4>Pathology</h4><p>The straight head of the <a href="/articles/rectus-femoris-muscle">rectus femoris muscle</a> originates from the AIIS and forceful extension at the <a href="/articles/hip-joint-1">hip joint</a> can lead to an <a href="/articles/avulsion-injuries">avulsion injury</a> at this point.</p><h4>Radiographic features</h4><h5>Plain radiograph</h5><p>The avulsed bony fragment may not be as obvious on the AP radiograph as on oblique projections.</p><h4>Treatment and prognosis</h4><p>Almost all cases are managed conservatively.</p>- +<p><strong>Anterior inferior iliac spine (AIIS) avulsion injuries</strong> are one of the six main types of <a href="/articles/apophyseal-avulsion-fractures-of-the-pelvis-and-hip">pelvic apophyseal avulsion fractures</a>. Subacute or chronic avulsion injuries can be mistaken for a pseudotumour. </p><h4>Epidemiology</h4><p>As with many pelvic avulsion injuries, they most often occur in adolescents (mostly between the ages 14-17). There is a slight male predilection and they tend to occur most often in sports involving kicking.</p><h4>Pathology</h4><p>The straight head of the <a href="/articles/rectus-femoris-muscle">rectus femoris muscle</a> originates from the AIIS and forceful extension at the <a href="/articles/hip-joint-1">hip joint</a> can lead to an <a href="/articles/avulsion-injuries">avulsion injury</a> at this point. The mechanism is one of forced hip extension with the knee in flexion <sup>4</sup>.</p><h4>Radiographic features</h4><h5>Plain radiograph</h5><p>The avulsed bony fragment may not be as obvious on the AP radiograph as on oblique projections.</p><h4>Treatment and prognosis</h4><p>Almost all cases are managed conservatively.</p>
References changed:
- 4. Narayanasamy S, Krishna S, Sathiadoss P, Althobaity W, Koujok K, Sheikh A. Radiographic Review of Avulsion Fractures RadioGraphics Fundamentals | Online Presentation. Radiographics. 2018;38(5):1496-7. <a href="https://doi.org/10.1148/rg.2018180064">doi:10.1148/rg.2018180064</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/30207944">Pubmed</a>
Tags changed:
- rg_38_5_edit
Image 7 X-ray (Frontal) ( create )
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