Pelvis

What are some key differences between the male and female pelvis?

• Female pelvis is larger and wider

• Female has a wider pelvic inlet

• Female pubic angle is obtuse whereas male is acute

• Male pelvis is more elongated

What is Paget’s disease?

Thickening of the bone most commonly in the pelvis

What is myeloma?

A type of blood cancer that arises from bone marrow

What’re the most common reasons for imaging the pelvis?

• Fractures

• Dislocation/subluxation

• Osteoarthritis

• Osteomyelitis

• Myeloma

• Paget’s

• Post surgery

What is osteomyelitis?

Bone infection caused by bacteria

What is the standard series of views for a pelvis?

• AP Pelvis

• Lateral hips

• Inlet and outlet views

Why do you suspend respiration for pelvic imaging?

Prevents bowel gas movement

What can happen if you over-rotate your legs?

Block the lesser trochanter from being visible

Patient Positioning for a AP Pelvis:

• Patient orientation

• Leg rotation

• Key notes

Patient orientation: supine

Leg rotation: 15 degrees internally

Key notes:

• Arms across stomach

• Suspended breathing

Which way is the leg rotated in this image?

Externally rotated

• Greater trochanter and femoral neck are superimposed

Which way is the leg rotated in this image?

Adequate internal rotation

• Maximum visualisation of femoral neck, greater and lesser trochanter

Name this view

AP Pelvis

AP Pelvis

• Collimation:

• Centering point:

• Leg rotation

Collimation:

• Laterally: skin margins

• Superiorly: Iliac crests

• Inferiorly: 10cm below greater trochanters

Centering point: midpoint between ASIS and pubic symphysis

Leg rotation: internally rotated 15 degrees

Name this view

Lateral pelvis (frog lateral)

Name this view

Modified axio-lateral