Bones - Part 2 Flashcards
Fracture with overlying skin intact
Simple
Fracture where bone communicates with skin surface
Compound
Fracture where bone is fragmented
Comminuted
Fracture where ends of bone at fracture site are NOT aligned
Displaced
Slowly developing fracture from increased loads due to physical activity
Stress
Fracture that only extends partially through bone
Greenstick
Osteonecrosis (Avascular Necrosis)
Infarction of bone and marrow
Infarction of bone and marrow
Osteonecrosis
What part of bone is usually NOT affected and why with Osteonecrosis
Cortex
– collateral blood flow
What usually causes Osteonecrosis?
Fractures
Corticosteroid treatment
What usually causes Osteonecrosis?
Fractures
Corticosteroid treatment
What shape is a Subchondral Osteonecrosis?
Wedge shaped
Will there be pain with Subchondral Osteonecrosis and what may develop?
Yes
– secondary osteoarthritis may develop
Will there be pain with Medullary Osteonecrosis?
No – usually silent
“Creeping Substitution” with Osteonecrosis
Trabeculae is a scaffold for new bone deposition
Osteomyelitis
Inflammation of bone and marrow following an infection
What pyogenic bacteria can cause Osteomyelitis?
Staph Aureus
Acute Osteomyelitis
Bacteria and neutrophils
What can be seen with Acute Osteomyelitis
Sequestrum = dead bone following subperiosteal abscess
Chronic Osteomyelitis
Osteoclastic reabsorption
What can be seen with Chronic Osteomyelitis?
Involucrum = new bone forms shell of living tissue around devitalized bone
Involucrum is seen with?
Chronic Osteomyelitis
– new bone forms shell around devitalized bone
Mycobacterial Osteomyelitis is usually blood borne. What will be seen histologically?
Caseous necrosis
Granulomas
Mycobacterial Osteomyelitis is more resistant and destructive. What is an example?
Pott Disease (TB) of the spine = compression fractures
Congenital skeletal Syphilis
Saber shin – bone deposited on anterior tibia
Acquired skeletal Syphilis
Saddle nose
