Lecture 26 - Bone Health, Falls and Fractures Flashcards

1
Q

by what age is the skeleton completely hardened

A

25

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2
Q

how many bones are in the human body

A

206

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3
Q

bone resorption is the action of what

A

osteoclasts and parathyroid hormone

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4
Q

bone deposition is the action of what

A

osteoblasts and calcitonin

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5
Q

bone resorption and bone deposition is regulated by

A

thyroid and parathyroid glands

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6
Q

an osteoblast ….

A

forms new bone tissue

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7
Q

an osteoclast …..

A

breaks down old bone tissue

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8
Q

what plays vital roles in bone development, growth and repair

A

vitamin A, vitamin D, calcium and other hormones

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9
Q

rates of bone growth is highest when

A

infancy and pubertal growth spurt

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10
Q

velocity of bone growth doubles when

A

adolescence critical period

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11
Q

~40% of peak bone mass is laid down when

A

end of puberty

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12
Q

at age 20 what % of peak bone mass is attained

A

90-95%

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13
Q

what happens to bone mass after your mid 30s (also how does men and women bone mass change throughout their life)

A

you begin to slowly lose bone mass

women lose bone mass faster after menopause, but it happens to men too

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14
Q

what are the determinants of bone strength

A
  • bone mineral density
  • geometry
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15
Q

what is the most important effect of stress on the bone and what is this

A

strain

measurement of deformation of bone to external load

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16
Q

what is said about your ground reaction forces if you are lighter

A

the lighter you are the smaller your ground reaction forces are

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17
Q

peripheral skeleton bone strength is positively associated with what

A

total and dairy protein intake in healthy postmenopausal women

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18
Q

in elderly ……
- inadequate intake of protein
- reduced ability to use available protein
- greater need for protein

leads to what

A

loss of functionality

  • muscle
  • bone
  • immune system
19
Q

the RDA of 0.8g/kg BW is not adequate for elderly, what is recommended

A

1.1 - 1.3 g/kg BW

20
Q

what is the strategy to maximise and protect bone mass in children

A

achieve peak bone mass

21
Q

what is the strategy to maximise and protect bone mass in adults

A

maintain bone maass

22
Q

what is the strategy to maximise and protect bone mass in older adults

A

slowing bone loss

reducing falls and fractures

23
Q

osteoporosis NZ estimates how many older kiwis have broken a bone since their 50th birthday

A

> 180,000

24
Q

annually how many people sustain a hip fracture, and how many are admitted to hospital with other fractures

A

~3,700 hip fractures

~13,800 admitted to hospital with other fractures

25
Q

what are the three types of osteoporosis

A

age associated / post menopausal

idiopathic

secondary

26
Q

what are the risk factors of osteoporosis

A

family history

27
Q

what are some diseases / genetics that are considered secondary risk factors for osteoporosis

A
  • multiple myeloma
  • metastatic bone cancer
  • rheumatoid arthritis
  • pagets disease
28
Q

what % of hip fractures are due to falls

A

> 95%

29
Q

what is the 5th leading cause of death in older adults

A

falls

30
Q

what are some risks for falls in older adults

A
  • muscle weakness
  • poor balance / physical activity
  • poor eyesight
  • benzodiazepine use
31
Q

what are the risks for fractures in falls for older people

A
  • failure to break a fall
  • falling to the side
  • age : increased risk of osteoporosis
  • low bone mass
32
Q

a prior fracture at any skeletal sight does what

A

doubles future fracture risk

33
Q

what does sarcopenia and osteoporosis lead to increased likeliness of

A

fracture

34
Q

does NZ have strength and balance programs to prevent falls in elderly

A

yes

35
Q

trials show what about vitamin D supplements and bone density

A

vitamin D supplements found to increase bone density

36
Q

what is found from clinical trials about vitamin D supplements and non skeletal endpoints

A

not demonstrated benefits on muscle mass or function

37
Q

calcium supplements in healthy individuals are ……

A

not needed

nor required in most people receiving treatment for osteoporosis

38
Q

current evidence says what about the use of vitamin D or Ca+ supplements in healthy community dwelling adults

A

evidence does not support

although it may be warranted in frail older adults in nursing homes with low vitamin D

39
Q

vitamin D supplementation is / isnt found to reduce risk of fractures

A

isnt

40
Q

the findings of vitamin D supplementation not being effective may not apply to ….

A

individuals with very low 25(OH)D levels, gastrointestinal disorders causing malabsorption or those with osteoporosis

41
Q

sarcopenia increases risk of ….. and osteoporosis increases risk of ….

A

sarcopenia increases risk of falls and osteoporosis increases risk of fractures

they both link together

42
Q

sarcopenia and osteoporosis share

A

an underlying pathology

43
Q

what happens to the prevalence of osteoporosis in those with sarcopenia compared to those who dont

A

increased prevalence of osteoporosis in those with sarcopenia

44
Q

co-occurrence (osteosarcopenia) is common and associated with a

A

higher degree of malnutrition than osteoporosis or sarcopenia alone