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What are the 4 steps of fracture repair?
Hematoma formation, 2. Callus formation, 3. Callus ossification, 4. Bone remodeling
What occurs during step 1 of fracture repair?
Hematoma forms in the area of fracture
What is the function of hematoma formation in step 1?
Stops bleeding
What is the function of callus in step 2 of fracture repair?
Connects broken bone ends
What happens internally during callus formation?
Blood vessels grow into area of fracture; macrophages clean up debris; collagen fibers and granulation tissue produced
What type of cartilage forms internally in the area of break?
Hyaline cartilage
What is the external callus in step 2?
Collar around bone ends
What tissues unite bone ends in the external callus?
Thin cartilage and woven bone
What occurs during step 3 (callus ossification) of fracture repair?
Spongy bone callus forms from osteoclasts
What cells are involved in callus ossification?
Osteoblasts
What occurs during step 4 (bone remodeling) of fracture repair?
Spongy bone is replaced by compact bone
What cells are involved in bone remodeling during fracture repair?
Osteoclasts