Human Anatomy & Physiology (Human Body Systems)

Unit 1: Unit 1: Identity (Tissues, Bones, Muscles)HBS 1.1Human Body Systems: skeletal system

Analyze a fracture

Name a broken bone by the pattern of the break and connect it to how bones and joints move.

Builds on (2 levels back)inferred · med confidence

Bones are strong but can break: A fracture is a break in a bone. You first need to accept bone as a hard tissue that cracks under enough force.
What a joint is: A joint is where two bones meet and move. Naming a break near a joint depends on knowing where joints are.

Prerequisites are inferred: pending teacher review.

Re-learn the skill with worked practice and clear examples.

Fracture names come from the break pattern: closed (skin intact) vs. open (bone breaks the skin), greenstick (bent and cracked on one side), and comminuted (broken into many pieces).

Step 1: Closed vs. open

First ask if the skin is broken. A closed fracture leaves the skin whole. An open fracture is one where the broken bone pierces through the skin, which raises infection risk.

Step 2: Read the pattern

A greenstick fracture is bent and cracked on only one side, like a young twig; it is common in children. A comminuted fracture is one where the bone is shattered into three or more pieces.

Fracture type	What the break looks like
Closed	Bone broken, skin still whole
Open	Bone breaks through the skin
Greenstick	Bent and cracked on one side only
Comminuted	Broken into three or more pieces

Step 3: Combine the clues

A single bone break can have two labels at once: for example, a closed comminuted fracture is shattered into pieces but the skin is unbroken.

Practice

An X-ray shows a forearm bone broken into four separate pieces. The skin over it is not broken. Which pair of names fits this fracture?

Reviewed

A.Open and greenstick
B.Closed and comminuted
C.Open and comminuted
D.Closed and greenstick

Show the worked solution ▾

Answer: B. Closed and comminuted

Step 1: Check the skin: The skin is not broken, so the break is closed, not open.
Step 2: Check the pieces: Four separate pieces means three or more, so the pattern is comminuted (not greenstick, which is a one-sided crack).

Why it's right: Skin intact makes it closed, and four pieces makes it comminuted, so it is a closed comminuted fracture.

Why the others miss:

A: The skin is intact, so it is not open; four pieces is not a one-sided greenstick crack.
C: The skin is intact, so it is closed, not open.
D: Four separate pieces is comminuted, not a one-sided greenstick crack.

Aligned to HBS: classifying fractures · reading level ~grade 9

Where you'd see this

An ER nurse charting 'closed comminuted fracture, distal radius' is using these exact pattern names so the surgeon knows the plan before seeing the X-ray.

Careers that use this

Emergency Room Nurse: Describes a break by its pattern and whether it is open or closed so the team can triage infection risk and surgery.

Video library

Watch: Analyze a fracture

Fractures | Classification and Bone Healing | Types of Fractures

sqadia.com · ~25 min

Guided notes

Fill these in as you work through the lesson.

Big idea: Doctors name a bone break by what the break looks like, and the bones around a joint shape how the injury happens.

Key terms: write the meaning

Fracture (another word for this kind of injury):
Joint (where two bones meet):
X-ray (the image used to see the break):
Skin (what an open break pushes through):

The rule

A break where the skin stays whole is a fracture. A break where bone breaks the skin is an fracture. A bone broken into many pieces is a fracture.

Check yourself

What is the difference between a closed fracture and an open fracture?
Why is a place where two bones meet (a joint) more likely to get hurt during a fall?
Name one fracture type and describe what its break pattern looks like.

Work one example

An X-ray shows a leg bone snapped into three separate pieces, with the skin unbroken. Decide whether it is open or closed, and name the pattern shown by the multiple pieces.