Radiology Flashcards
Under the less than ideal conditions of motion and poor blood supply to the fracture, what will mesynchemal cells differentiate into during healing?
Chondroblasts - hyaline cartilage produced. Later mineralised and converted to bone by endochondral ossification.
If there is tension at the fracture site, what will mesynchemal cells differentiate into during healing?
Fibroblasts - produce fibrous tissue. Not good as this hampers bone union.
How long after a fracture should a bridging be present? Will it be visible on radiographs?
Approximately 2 weeks. Will only be faintly visible as it is a mixture of cartilage and bone.
Describe a simple fracture:
One fracture line, two main fragments
Describe a comminuted fracture:
More than one fracture line - communicate. Three or more fragments.
Describe a pathological fracture:
Occurs without trauma as a result of weakening of the bone by underlying disease (nutritional, metabolic, neoplastic).
Describe a chip fracture:
Small fragments of bone.
Describe a slab fracture:
From one joint surface to another.
Describe an Avulsion fracture:
At the attachment sites of tendons, ligaments and joint capsules - caused by excessive force on these structures.
Describe multiple/segmental fractures:
More than one fracture line - DO NOT communicate.
Describe compression/impacted fractures:
Trauma that crushes the bone. Most common in vertebral bodies.
Describe depression fractures:
Occur in the skull, sinuses and nose. Fracture fragments are displaced below the normal surface.
Describe a fissure fracture:
Incomplete fracture.
Describe Salter-Harris classification class I:
Fracture through the physis.
Describe Salter-Harris classification class II:
Fracture through the physis and into the metaphysis. A metaphyseal fragment remains attached to the to the epiphysis.
