Path - Bones Flashcards

1
Q

function of osteoblasts

A

synthesize, transport, and assemble matrix

regulate mineralization

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2
Q

compare osteocytes and osteoblasts

A

osteocytes are inactive osteoblasts with less cytoplasm

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3
Q

what bone cells have canaliculi and what do they use them for

A

osteocytes

use them as tunnels that the osteocyte dendritic processes use to network

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4
Q

describe the chemicals associated with building bone and those with breaking down bone

A

build: estrogen, testosterone, vitamin D
breakdown: PTH, IL-1, glucocorticods

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5
Q

define dysostosis and what genes it is related to

A

migration and condensation of mesenchyme and differentiation into cartilage anlage

associated with homeobox genes

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6
Q

define syndactyly/craniosynostosis

A

abnormal fusion of bone

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7
Q

is dysplasia of bone pre-malignant?

A

no

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8
Q

what are the differences between OI type 3 and 4

A

type 3:

  • fractures present at birth
  • short stature
  • blue, purple, grey sclera
  • loose joints and poor muscle development
  • more definitive spinal curvature
  • often severe bone deformity

type 4:

  • fractures mostly before puberty
  • shorter than average
  • white/near white sclera
  • tendency towards spinal curvature
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9
Q

what are the similarities between OI type 3 and 4

A
  • improperly formed collagen
  • barrel-shaped rib cage
  • triangular face
  • brittle teeth possible
  • hearing loss possible
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10
Q

mutation in CLCN7 indicates

A

osteopetrosis (marble bone dz, albers-schonerg dz)

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11
Q

CA2 deficiency indicates

A

osteopetrosis (marble bone dz, albers-schonerg dz)

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12
Q

bones that lack a medullary cavity indicate

A

osteopetrosis (marble bone dz, albers-schonerg dz)

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13
Q

erlenmeyer flask bone findings on x-ray indicate

A

osteopetrosis (marble bone dz, albers-schonerg dz)

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14
Q

optic atrophy, deafness, and facial paralysis cranial nerve deficits are indicative of what bone dz

A

osteopetrosis (marble bone dz, albers-schonerg dz)

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15
Q

defects in acid hydrolase enzymes are associated with what disease group

A

mucopolysaccharidoses

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16
Q

what happens to the bone in mucopolysaccharidoses

A

chondrocytes degrade ECM mucopolysaccharides –> mucopolysaccharides accumulate in chondrocytes in the extracellular space –> structural defects in articular cartilage

17
Q

clinical presentation of a patient with mucopolysaccharidoses

A

short stature, chest wall abnormalities, malformed bones

18
Q

atraumatic or vertebral compression fracture indicates

A

osteoporosis

19
Q

what genetic factors are associated with osteoporosis

A

LRP5 single gene defect

also RANKL, OPG, RANK, HLA, estrogen receptor gene, vitamin D receptor gene

demo: caucasian with light colored hair and eyes

20
Q

what treatment for breast cancer has been associated with osteoporosis

21
Q

what are some secondary causes for osteoporosis

A

renal or hepatic failure, hyperthyroidism

22
Q

SQSTM1 gene mutation is associated with what dz

A

sporadic paget disease

not familial

23
Q

“cotton wool” finding on x-ray indicates what dz

24
Q

what types of fractures occur in paget dz

A

chalk-stick type fx of long bones of legs

25
leontiasis ossea (lion face) and platybasia (invagination of skull base) are associated with what dz process
paget dz
26
bowing out of lower limbs with increased warmth and tenderness over the bones indicates what dz
paget dz
27
compare rickets and osteomalacia
both vitamin D deficiency or abnormal metabolism of vitamin D Rickets: children, interferes with deposition of bone in the growth plate osteomalacia: adults, bone formed during remodeling is under-mineralized --> predisposing to fractures
28
clinical sx of rickets
- bowed legs - frontal bossing (large forehead) - squared off head - rachitic rosary of ribs - anterior protrusion of chest (pigeon breast) - lumbar lordosis
29
"railroad track" bones indicate what dz
hyperparathyroidism causing dissecting osteitis
30
why is renal osteodystrophy called the "silent crippler"
the bone changes from renal osteodystrophy can begin many years before sx appear in adults with kidney dz
31
what is osteonecrosis
infarction of the bone and marrow
32
compare subchondral and medullary infarcts in osteonecrosis
subchondral: cause pain and are initially associated only with activity, then becomes constant medullary: usually small and clinically silent
33
80-90% of osteomyelitis cases are caused by what organism
s. aureus
34
osteomyelitis in a sickle cell patient is often caused by what organism
salmonella
35
what is seen on histology in mycobacterial osteomyelitis
caseous necrosis and granulomas