Bone Tissue Chapter 5

Bone Tissue Chapter 5 -- A&P Textbook

Closed (Simple) Fracture

fracture in which skin remains intact

Open (Compound) Fracture

-fracture in which at least one end of broken bone tears thru skin;
-has high risk of infection

Greenstick Fracture

partial fracture in which only one side of bone is broken

Impacted Fracture

one fragment is driven into the other, usually due to compression

Comminuted Fracture

several breaks result in many small pieces between two large segments

Spiral Fracture

bone segments are pulled apart as a result of a twisting motion

Oblique Fracture

occurs at angle that is not 90 degrees

Transverse Fracture

occurs straight across long axis of bone

Fracture Hematoma

clotting blood of a bone forms after 6-8 after fracture due to fracture

Stages in Fracture Repair

1) Fracture Hematoma forms
2) Internal and External Calli form -- help stabilize fracture
3) Cartilage of the Calli replaced by trabecular bone
4) Remodeling occurs

Internal Callus

-forms within 48 hours after fracture
-formed by chondrocytes from endosteum
-formed from secretion of fibrocartilaginous matrix between two ends of broken bone

External Callus

-forms around outside of break
-formed by periosteal chondrocytes & osteoblasts
-made of hyaline cartilage and bone

Trabecular Bone

-replaces cartilage in Calli via endochondral ossification