Congenital and metabolic bone disorders Flashcards

1
Q

Inheritance of achondroplasia

A

Autosomal dominant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Mutation in achondroplasia

A

FGFR3 on chromosome 4, inhibits endochondral growth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Narrow and disorganizes zones of proliferation and hypertrophy of bone

A

Achondroplasia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Laron dwarfism

A

Pituitary dysfunction or secondary to a mutation in growth hormone receptor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Inheritance of osteogenesis imperfecta

A

Autosomal dominant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Deficiencies in type I collagen synthesis related to defects in EC structural proteins

A

Osteogenesis imperfecta

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Mutation in osteogenesis imperfecta

A

COL1A1 and COL1A2 genes encoding alpha-1 and -2 chains of type 1 collagen due to replacement of glycine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Group of rare genetic disorders characterized by reduced bone resorption due to deficient osteoclast development or function

A

Osteopetrosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Mutations and inheritance associated with osteopetrosis

A

TCIRG1 –> AR
CLCN7 –> AD
CA-II –> AR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Normal function of TCIRG1

A

Makes an osteoclast proton pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Normal function of CLCN7

A

Osteoclast chloride channel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Albers-Schonberg disease

A

Osteopetrosis caused by CLCN7 mutation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Normal function of CA-II

A

Generates protons and facilitates the resorption pit acidification by osteoclasts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Deposited bone tends to woven instead of lamellar

A

Osteopetrosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Inheritance of infantile osteopetrosis

A

Autosomal recessive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Inheritance of adult osteopetrosis

A

Autosomal dominant

17
Q

Treatment for osteopetrosis

A

Hematopoietic stem cell transplantation –> osteoclasts are derived from

18
Q

Radiologic features of osteopetrosis

A

Lack of medullary canal with misshapen ends of long bones

19
Q

Histologically normal bone that is decreased in quantity

A

Osteoporosis

20
Q

Three phases of Paget disease

A

Initial osteolytic stage
Mixed osteoclastic-osteoblastic stage
Burned-out quiescent osteosclerotic stage

21
Q

Marked by increased, but disordered and structurally unsound bone mass

A

Paget disease or osteitis deformans

22
Q

Haphazardly oriented lamellae are joined by a prominent cement line

A

Paget disease

23
Q

Mutation in Paget disease

A

SQSTM1 resulting in increased NFkB activity

24
Q

Platybasia

A

Flattening of base of skull causing impingement in Paget disease

25
Q

Increased alkaline phosphatase and urinary excretion of hydroxyproline with normal Ca, phosphorous, and PTH

A

Paget disease

26
Q

Complications of Paget disease

A

Osteosarcoma or fibrosarcoma
High output heart failure

27
Q

3 skeletal abnormalities associated with hyperparathyroidism

A

Osteoporosis
Brown tumors
Osteitis fibrosa cystica

28
Q

Secondary hemorrhage, macrophage recruitment, and ingrowth of reparative fibrous tissue that creates a mass lesion

A

Brown tumor

29
Q

Combination of increased bone cell activity, peritrabecular fibrosis, and cystic brown tumors

A

Generalized osteitis fibrosa cystic or von Recklinghausen disease of bone

30
Q

Clinical features of hyperparathyroidism

A

Stones - kidney stones
Bones - skeletal changes
Moans - depression
Groans - GI irregularities

31
Q

Manifestations of renal osteodystorphy

A

Osteopenia/porosis
Osteomalacia
Secondary hyperparathyroidism
Growth retardation

32
Q

3 mechanisms through which kidney disease causes skeletal abnormalities

A

Tubular dysfunction
Secondary hyperparathyroidism
Decreased biosynthetic function (vit D)

33
Q

Normal Ca, phosphate, alkaline phosphatase and PTH

A

Osteoporosis

34
Q

Normal or decreased CA, normal PTH and phosphate, increased alkaline phosphatase

A

Paget disease

35
Q

Decreased Ca and phosphate, increased alkaline phosphatase and PTH

A

Osteomalacia or Rickets

36
Q

Increased Ca, alkaline phosphatase, and PTH. Decreased phosphate

A

Osteitis fibrosa cystica in primary hyperparathyroidism

37
Q

Decreased Ca. Increased phosphate, alkaline phosphatase, and PTH.

A

Secondary hyperparathyroidism in CKD

38
Q
A