Hip bone

Consists of three parts:
1) Ilium > upper
2) Pubis > lower and anterior
3) Ischium > lower and posterior
They are united around the acetabulum.


1st - Ilium
It has 4 borders:

Anterior:

• Anterior superior iliac spine
• Anterior inferior iliac spine

Posterior

• Posterior superior iliac spine
• Posterior inferior iliac spine
• Greater part of the greater sciatic notch

Upper:

• Iliac crest: contains iliac tubercle anteriorly

Lower:

• Outside: continues with acetabulum
• Inside: arcuate line which indicates margin of pelvis

2 surfaces:

• Gluteal (surface) lateral, contains:

- Inferior gluteal line
- Middle gluteal line
- Posterior gluteal line

• Pelvic (medial) surface:

- Iliac fossa (anterior)
- Sacro-pelvic surface (Auricular line & pelvic part)


2nd - Pubis
It's body has:

3 surfaces

• Anterior
• Posterior = pelvic
• Medial

2 borders

• Lower border continues with pubic arch

Upper has:

• Pubic crest (medial)
• Pubic tubercle (lateral)

2 rami:

• Superior ramus, has 3 surfaces (Pelvic, Obturator and Pectineal)
• Inferior ramus with ishial ramus > from pubic arch

3rd - Ischium:
Body:

2 borders

• Anterior: obturator foramen
• Posterior: has ishial spine dividing the back to give greater and lesser sciatic notchs

3 surfaces:

• Lateral: femoral
• Medial: pelvic
• Posterior: ischial tuberosity that is divided into upper quadrangular and lower triangle

Ramus:

• with inferior pubic ramus form pubic arch

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