ORTHO 119 Shoulder Trauma Flashcards
What is bone?
A specialised form of connective tissue
What are the two types of bone?
Trabecullar (cancellous) and cortical (compact) bone
Describe trabecular bone
Spongy bone with high turnover axially. Site of bone remodelling and mineral homeostasis
Describe cortical bone
Compact bone with low turnover, found peripherally. Has trabecullar shell and has mainly mechanical and protective functions. Contain lacunae, haversian canals, osteons and canniliculi
Describe lacunae and where are they found?
Concentric layers of dense connective tissue in cortical bone
What type of collage comprises most of organic bone?
Type 1 from osteoblasts
What is inorganic bone?
Bone with high mineral content of calcium hydroxyapetitie crystals
What is an osteoid?
It is an area of newly formed unmineralised bone
What are the 4 types of bone cells?
Osteoprojenitor, Osteoblasts, osteocytes and osteoclasts
What are osteoprojenitor cells?
Self replicating precursor cells that differentiate into bone forming cells
What are osteoblasts?
Bone forming cells that deposit osteoid and control mineralisation
What are osteocytes?
Modified osteoblasts which have become surrounded by newly formed bone
What are osteoclasts?
Macrophage like cells that resorb bone
What is the role of canniliculi?
They permeate through the new bone and link lacunae between adjacent osteocyte processes
Act as mechanotransducting cells
What controls bone resorption and remodelling?
The RANK/OPG system