The Hip bone is the first bone of the lower extremity. 

It has three parts :

1) Ilium

2) Ischium

3) Pubis

1. Ilium of Hip bone : 

The ilium forms The upper expanded plate part of the hip bone. 

It has three borders : 

• 1) Anterior  border
• 2) Posterior border
• 3) Medial border

It has three surfaces :

• 1) Glutial surface
• 2) Iliac surface
• 3) Sacropelvic surface

It has four Iliac spine :

• 1) Anterior Superior iliac spine
• 2) Anterior Inferior iliac spine
• 3) Posterior Superior iliac spine
• 4) Posterior Inferior iliac spine

It has iliac crest.

It has iliac fossa.

It has a greater sciatic notch.

It has iliac tuberosity.

2. The ischium :

The ischium forms the Posteroinferior part of the hip bone.

It has :

• Ischial spine.
• Lesser  sciatic notch.
• Ischial Tuberosity,   
• Acetabulum and 
• Acetabular notch.

3. Pubis :

The pubis  forms the Anterior part of the hip bone.

It has : 

• Obturator foramen
• Pubis crest
• Pubis tubercle 
• Superior ramus of Pubis. 
• Inferior ramus of pubis. and
• Pubis symphysis