Pelvis & Perineum

Question 1

What is the significance of the pelvic brim?

Answer 1

Determines plane for pelvic inlet

Question 2

False pelvis

Answer 2

Above pelvic brim/inlet

Question 3

True pelvis

Answer 3

Below pelvic brim/inlet

Question 4

Two defining features to know between male + female pelvis

Answer 4

1) Subpubic angle (men narrow, women wide)

2) Size of pubic inlet (men narrow + heart-shaped, women wide + oval)

Question 5

How are female pelvises different from male pelvises in terms of restriction?

Answer 5

Less restriction by sacral promontory

Question 6

Ring bone rule

Answer 6

In a ring bone, if you see a fracture or dislocation in one part of that bone, look for another.

*Also look for abnormal joint displacement

Question 7

5 rules of evaluating a pelvic x-ray

Answer 7

1) Look quickly to get a “feel” for symmetry.
2) Look at the “Circles,” the big circle being the pelvic inlet. The little circles being the obturator foramina.
3) Look at the sacroiliac joints.
4) Look at the pubis symphysis.
5) Look at the acetabuli.

*Symmetry is key!

Question 8

Where is a common site of avulsion injuries in young athletic individuals?

Answer 8

Most frequent at ASIS

*Where hamstrings attach