The AIIS stands for the Anterior Inferior Iliac Spine. It is a bony prominence located on the anterior (front) side of the ilium, which is one of the three bones that make up the pelvis.
Detailed Explanation of the AIIS
The Anterior Inferior Iliac Spine plays a crucial role in the human body as:
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Origin Point for Muscles: It serves as the origin point for the direct head of the rectus femoris muscle (part of the quadriceps group), which is essential for hip flexion and knee extension. It also serves as an attachment point for the ilio-capsularis muscle.
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Location: The AIIS is situated superior (above) and anteromedial (towards the front and middle) to the most lateral point on the acetabular rim (the socket of the hip joint).
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Clinical Significance: Avulsion fractures of the AIIS can occur, particularly in young athletes, due to forceful muscle contractions. This is when the tendon and muscle pull off a piece of bone.
Key Features Summarized:
| Feature | Description |
|---|---|
| Full Name | Anterior Inferior Iliac Spine |
| Location | Anterior Ilium (part of the pelvis) |
| Muscle Attachment | Direct head of the Rectus Femoris muscle, Ilio-capsularis muscle |
| Function | Provides an attachment point for muscles involved in hip flexion and knee extension |
| Clinical Relevance | Susceptible to avulsion fractures, especially in adolescents. |
In essence, the AIIS is a significant bony landmark in the pelvis that facilitates essential muscle attachments and plays a key role in lower limb movement.
