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FRACTURES ((Greenstick (common in soft bones of infancy), Comminuted,…
FRACTURES
Greenstick
common in soft bones of infancy
Comminuted
displaced
Complete of incomplete
simple or compound
Pathologic
fracture
Stress fracture
OSTEONECROSIS (Avascular Necrosis)
Infarction of bone & Marrow
trabecular bone & Marrow
involve both medulla & cortex
Pain-w/ activity then 2ndary supervene
Cortex & Cartilage
Not affected usually
Subchondral infarcts triangular, wedge shaped
Creeping substitution for deposition of new bone
Dead bone=empty lacuane
Healing of fractures
1)formation of soft-tissue callus or procallus
end of 1st week
2) formation of bony callus
through enchondral ossification (2wks)
Pseudoarthrosis
due to cystic degeneration of malformed callus
Infections