High-Yield Pelvic Anatomy (Radiographic Focus)
Key Radiographic Landmarks (AP Pelvis)
| Structure | Radiographic Feature |
|---|---|
| Shenton’s Line | Smooth arc formed by the medial edge of the femoral neck and the superior border of the obturator foramen. |
| Iliopectineal Line | Indicates the anterior column of the acetabulum. |
| Ilioischial Line | Indicates the posterior column of the acetabulum. |
| Acetabulum | Check for concentricity of the femoral head within the acetabular cup. |
NEET PG “Must-Know” Clinical Pearls
- Shenton’s Line Disruption: Indicates hip dislocation or femoral neck fracture.
- Pelvic Ring Fractures: The pelvis acts like a ring; if there is one fracture, there is usually a second (or a ligamentous disruption) elsewhere in the ring.
- Sacroiliac (SI) Joint: Evaluate for symmetry and joint space narrowing (e.g., in Ankylosing Spondylitis).
- Pubic Symphysis: Normal distance in adults is generally < 5-6 mm; widening suggests diastasis.
- Lesser Sciatic Foramen: Bounded by the sacrotuberous and sacrospinous ligaments; passage for the pudendal nerve.