Question

fracture repair
have you ever broken a bone? doctors are fantastic – but their primary role in repairing a broken bone is setting the bone if necessary. your bone heals itself!
steps: use osteoblasts, osteoclasts, and osteocytes to fill in the details of fracture repair.
you are playing soccer and you break your tibia. the doctor sets the tibia and puts you in a cast.
step 1: a hematoma forms in the break of the bone. this is a very temporary fix.
step 2: a soft callus forms. this callus is made of cartilage and collagen.
step 3: a bone callus forms. the soft callus ossifies as
__________________________ lay down osteoid, forming a large, bulky bone
callus. as the __________________________ create osteoid, they get buried and
become __________________________.
step 4: the bone callus formed in step 3 is often very bulky and not anatomically correct;
therefore, it must be remodeled. __________________________ shave away excess
bone from the bone callus to make the bone the proper diameter and hollow out the
medullary cavity.
conclusion questions:

1. put the following steps in order: soft callus, bone remodeling, hematoma, bone callus.

______________________________________________________________________

1. what does “hema” mean? what does “toma” mean? what is a hematoma, then?

______________________________________________________________________

1. why does remodeling have to occur at the end of fracture repair? _____________________

______________________________________________________________________
______________________________________________________________________

1. what role does a doctor play in fracture repair? _______________________________

______________________________________________________________________

Explanation:

Step1: Fill Step3 blanks

Osteoblasts lay down osteoid, forming a large, bulky bone callus. As the osteoblasts create osteoid, they get buried and become osteocytes.

Step2: Fill Step4 blank

Osteoclasts shave away excess bone from the bone callus to make the bone the proper diameter and hollow out the medullary cavity.

Step3: Order fracture repair steps

1. Hematoma, soft callus, bone callus, bone remodeling

Step4: Define hematoma components

• "hema" means blood; "toma" means swelling/mass. A hematoma is a localized collection of blood (clot) at the fracture site.

Step5: Explain need for remodeling

The initial bone callus is bulky and not anatomically shaped, so remodeling restores the bone's proper size, shape, and hollow medullary cavity for normal function.

Step6: State doctor's role

A doctor sets the broken bone (aligns it correctly) and immobilizes it (e.g., with a cast) to support the bone's natural healing process.

Answer:

Fracture Repair Steps Fill-Ins:

Step 3: osteoblasts; osteoblasts; osteocytes
Step 4: osteoclasts

Conclusion Questions:

1. Hematoma, soft callus, bone callus, bone remodeling
2. "Hema" means blood; "toma" means a swelling/mass. A hematoma is a localized clot/collection of blood at the broken bone site.
3. The initial bone callus is overly bulky and not in the bone's proper anatomical shape; remodeling fixes this to restore the bone's normal size, structure, and function, including re-forming the hollow medullary cavity.
4. A doctor's primary role is to set (realign) the broken bone correctly and immobilize it (such as with a cast) to allow the bone to heal on its own.