Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Musculoskeletal System > Pathology > Flashcards

Pathology Flashcards

1
Q

What is the most common degenerative joint disease?

A

Osteoarthritis

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

What is the pathogenesis of osteoarthritis?

A

Chronic progressive destruction of articular cartilage
- can be 1° or 2° (eg. trauma, congenital abnormality, avascular necrosis, other joint disease)

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

How does osteoarthritis present?

A

1) Pain
2) Limitation of movements
3) Swelling and osteophytes
4) Cervical spondylosis spinal nerve compression

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

What are the 3 forms of osteoarthritis?

A

1) Primary generalised OA
- most common in post-menopausal women

2) Erosive inflammatory OA
- severe destructive disease w rapid progression

3) Hypertrophic OA
- florid osteophyte formation, bone sclerosis w slow progression

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

What is the pathogenesis of hypertrophic osteoarthritis?

A

Multifactoral
eg. ↑joint load
degradation of articular cartilage
biochemical abnormalities (eg. ↓proteoglycans, protein synthesis, chondrocyte replication)
Genetic abnormalities (familial mutation of type 2 collage COL2A1)

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

Degenerative, inflammatory and reparative activity involving articular cartilage & subarticular bone, with secondary effects on synovium, muscle and nerves.

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

What is the characteristic histological findings in osteoarthritis?

A

Damage and destruction of articular cartilage:
- thinning
- erosion
- fibrillation/erosion → “cracking”

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

What are 2 bone presentations of osteoarthritis?

A

1) Eburnation
- exposed bone w polished surface due to contact friction of bone surface

2) Formation of subchondral cyst

3) Thickening of subarticular bone

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

What are 4 radiological features of osteoarthritis?

A

1) Narrowing of the joint space
2) Sclerosis (thickening of subchondral bone)
3) Subchondral cyst
4) Osteophytes (peripheral growths of bone and cartilage)

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

What are 5 pathological findings of osteoarthritis?

A

1) Destruction of articular cartilage

2) Eburnation and thickening of subarticular bone

3) Formation of subchondral cyst

4) Formation of osteophytes/bone (eg. Herberden’s nodes)

5) Reactive thickening of synovium

6) Secondary changes to surrounding tissue (eg. muscle atrophy)

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

What is the normal structure of an intervertebral disc?

A

1) Central nucleus pulposus (water, proteoglycans)

2) Surrounding annulus of obliquely oriented collagen fibres

3) Cartilaginous end plate

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

What are 4 possible aetiologies/components of intervertebral disc degeneration?

A

1) Genetics

2) Age-related “wear and tear”
- eg. nucleus pulposus becomes dehydrated, fibrotic and atrophied

3) Mechanical
- eg. occupational, bad posture, strain, trauma → crack/tears in disc annulus and nucleus pulposus

4) Others
- eg. nutrition, metabolic, infection

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

Bulging/prolapse of nucleus pulposus through a weakened annulus is most common in which direction?

A

Posterior/posterolateral
- with the outer layers of the annulus still intact

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

What is a disc herniation?

A

Nucleus pulposus of intervertebral disc spurts out through a tear in the annulus into either spinal canal or foramen.

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

What is the difference between a disc prolapse, extrusion and sequestration?

A

Bulging: outer layers of annulus intact

Extrusion: tear in annulus but nucleus pulposus intact

Sequestration: tear in annulus + portions of nucleus breaks free

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

What are 2 complications of disc bulging/herniation?

A

1) Posterior → spinal cord (myelopathy)
- cervical myelopathy
- spasticity
- unsteady gait
- clumsiness in hands

2) Postero-laterally → nerves roots (radiculopathy)
- dermatomal neurological deficits (motor or sensory)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is rheumatoid arthritis?

A

Systemic chronic inflammatory autoimmune disease affecting many tissues but principally attacking the joints

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Rheumatoid arthritis EPC:
Most common in (M/F)
Age: _____________

A

Rheumatoid arthritis EPC:
Most common in F
Age: 40-60y

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Which part of the body is most common affected by RA, and where are the typical extra-articular areas of involvement?

A

Articular:
1) PIP and MCP of hand
2) Wrist
3) Elbows
4) Knees

Extra-articular:
1) Skin
2) Heart
3) Blood vessels
4) Muscles
5) Lungs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are 2 key autoAbs used in the diagnosis of RA?

A

1) Rheumatoid factor (RF)
2) Anti-citrullinated protein Ab (ACPA)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the main genetic predisposition for RA?

A

HLA-DR4 (MHC Class 2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Describe the pathogenesis of RA.

A

Cytokine-mediated CD4+ T cell inflammation

1) Susceptibility
a) genes (eg. HLA) → loss of self-tolerance and lymphocyte regulation
b) environmental (eg. infection, smoking) → enzymatic modification of self proteins

2) CD4+ T cell activation
a) Th1 → M1 macrophage
b) Th17 → cytokines

3) Cell responses:
a) B cell → RF → immune complex deposition → joint injury

b) Cytokines + M1 → joint cell proliferation + enzymes and PGE2

c) Endothelial activation → expression of adhesion molecules → accumulation of inflammatory cells

4) Pannus formation
- destruction of bones, cartilage, fibrosis, ankylosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are the 4 pathological features of RA?

A

1) Synovial inflammation
- chronic inflammatory infiltrate, lymphoid aggregates, exudate, fibrin → swelling and villous formation of the synovium

2) Pannus formation
- granulation tissue → fibrosis → ankylosis

3) Destruction of adjacent bone → joint deformity

4) Formation of rheumatoid nodules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the characteristic histological feature of systemic rheumatoid arthritis?

A

Rheumatoid nodules
- granuloma w central zone of fibrinoid necrosis
- found in many organs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What are 3 systemic effects of rheumatoid arthritis?

A

1) Rheumatoid nodules
2) Necrotising vasculitis
3) Amyloidosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What are 2 causes of autoimmune arthritis?

A

1) SLE
2) Rheumatic fever
3) Systemic sclerosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What are 4 characteristics of seronegative spondyloarthropathies?

A

1) Sero-negative (lack of rheumatoid factor)

2) High incidence of HLA B27 Ag

3) Axial location (eg. vertebral/sacro-iliac joint) or asymmetric involvement of peripheral joints in the digits

4) Pathology often in ligamentous attachments rather than synovium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What are 3 forms of seronegative spondyloarthropathies?

A

1) Ankylosing spondylitis

2) Psoriatic arthropathy

3) Reactive arthrtitis

29
Q

Where does ankylosing spondylitis usually occur?

A

Destruction and fibrotic fusion (ankylosis) of vertebral column and sacroiliac joints

30
Q

Where does psoriatic arthropathy usually occur?

A

Distal interphalangeal joint

31
Q

Where does reactive arthritis usually occur?

A

1) Conjuctivitis
2) Polyarthritis
3) Urethritis

32
Q

True or false: Disc degeneration is a complex disorder with often multi-factorial etiologies.

A

True

33
Q

What is septic arthritis?

A

Suppurative inflammation of the synovium and joint structures due to infection

34
Q

How does septic arthritis usually present?

A

1) Acute onset joint pain
2) Warm, swollen joint
3) Fever
4) Other systemic symptoms

35
Q

True or false: Septic arthritis is an unconcerning diagnosis as it is usually self-resolving.

A

False.
Serious condition as it can cause rapid, permanent joint destruction

36
Q

What are 3 sources of infection in septic arthritis?

A

1) Hematogenous spread
2) Direct inoculation through skin
3) Contiguous infective spread from adjacent soft tissue abscess or osteomyelitis

37
Q

What are 4 typical infective agents for septic arthritis?

A

Bacterial
1) Staph aureus
2) Streptococci
3) Pseudomonas
4) Gram negative bacilli

38
Q

What is crystal arthropathy?

A

Deposition of crystal in joints and soft tissues causing arthritis

39
Q

What are the 2 main forms of crystal arthropathy?

A

Gout and pseudogout

40
Q

How do crystal arthropathies usually present?

A

Acute pain, swelling and redness in joints especially foot and big toe

41
Q

True or false: Crystal arthropathy can always be distinguished from septic arthritis on physical examination and history.

A

False. They may be clinically indistinguishable and require joint fluid analysis (gram-stain, culture, crystal analysis)

42
Q

Gout is characterised by ____________________.

A

↑serum uric acid and urate crystal deposition

43
Q

What is the difference between primary and secondary gout?

A

1°:
- idiopathic
- a/w obesity, alcohol, HTN, fatty diet

2°:
- Due to known conditions that cause hyperuricemia
- eg. drugs, renal failure, familial juvenile nephropathy & congenital enzyme defects

44
Q

Describe the pathogenesis of gout.

A

1) Excess uric acid → urate crystals

2) Macrophages phagocytose urate crystals → activate inflammatory mediators that release IL-1

3) IL-1 recruit neutrophils → more cytokines, ROS, proteases

4) Neutrophils + Macrophages phagocytose crystals → damage the membranes of lysosomes → release of enzymes

45
Q

What are 3 ways that hyperuricemia may occur?

A

1) Overproduction of purines
- eg. high purine diet (meat), de novo synthesis, rare enzymatic defects

2) ↑catabolism of nucleic acids due to high cell turnover (eg. infection, cancer)

3) Decrease uric acid excretion by kidneys

46
Q

What are the long term complications of gout?

A

1) Deformities
2) Erosions of the joints
3) Gouty tophi
4) Interstitial nephritis
5) Nephrolithiasis
6) Renal failure

47
Q

What is the appearance of synovial fluid of a gout-affected joint under polarised microscopy?

A

Strongly birefringent needle shaped crystals

48
Q

What is pseudogout?

A

Chondrocalcinosis
- deposition of calcium pyrophosphate dihydrate

49
Q

What is the cause of pseudogout?

A

Idiopathic
- a/w trauma, hyperparathyroidism, haemochromatosis

50
Q

How does pseudogout typically present?

A

Frequently asymptomatic
- may present as acute/subacute/chronic arthritis
- DDx: OA and RA

51
Q

What is the appearance of synovial fluid of a pseudogout-affected joint under polarised microscopy?

A

Rhomboid shaped and positively birefringent crystals

52
Q

Which parts of bone are commonly affected by osteomyelitis?

A

1) Cortex
2) Medulla
3) Periosteum

53
Q

What is the main causative agent of osteomyelitis?

A

Staph aureus (~90% in all age grps)
- E. coli, GBS in neonates, H. influenzae
- Salmonella in Sickle cell disease
- mixed infection w anaerobes in trauma
- mycobacterial tuberculosis

54
Q

How does osteomyelitits usually present?

A

1) Suppurative (acute/chronic OM)
2) Non-suppurative chronic OM/tuberculous OM
3) Pain
4) Fever
5) Swelling
6) Constitutional symptoms

55
Q

True or false: Upon negative culture of joint aspiration, a suspected case of osteomyelitis should be treated conservatively.

A

False.
Up to 50% of cases may not grow bacteria on culture, therefore treat aggressively and empirically

56
Q

What are 3 ways infective agents may enter bone in osteomyelitis?

A

1) Direct implantation
- eg. trauma w open fracture, wound, surgery

2) Bloodborne spread (eg. lung TB to bone)

3) Extension from contiguous site (eg. middle ear infection → mastoiditis, infection of adjacent soft tissue)

57
Q

How is osteomyelitis classified?

A

Suppurative (pyogenic)
Non-suppurative (mainly chronic, fibrotic)

58
Q

Where does osteomyelitis usually affect children?

A

1) Long bones (trauma)
2) Jaw (poor dental health)

59
Q

Where does osteomyelitis usually affect adults?

A

1) Small bones of foot
2) Femur
3) Vertebral spine

60
Q

What other joint issue can arise from suppurative osteomyelitis?

A

Septic arthritis

61
Q

Describe the progression of osteomyelitis.

A

1) Suppurative injury

2) Elevation of periosteum
- abscess in subperiosteal space lifts periosteum → impair blood supply → further bone necrosis (sequestrum)

3) Rupture of periosteum
- inflammation of surrounding skin and tissue (cellulitis)

62
Q

What are 6 sequelae of osteomyelitis?

A

Healed OM:
1) Resolution (no or minimal scarring)
2) Healing w fibrosis

Complications:
3) Pathological fracture w deformities
4) Spread
5) Progression
6) Bone abscess (Brodie’s abscess)
7) Necrosis of bone (sequestrum)
8) Proliferative periostitis and involucrum
9) Sinus (skin and soft tissue)
10) Secondary amyloidosis
11) Rarely, malignant transformation (bone → osteosarcoma, skin → SCC)

63
Q

What is Garre’s osteomyelitis?

A

Garre’s sclerosing osteomyelitis:
- chronic osteomyelitis w proliferative periostitis
- mainly affects childrens and adolescents
- typically involves the jaw → new bone formation obscures underlying native bone structure
- a/w mild irritation, dental infection, trauma

64
Q

What is a common differential for Garre’s osteomyelitis?

A

Malignancies (esp clinically and radiologically)
- eg. osteosarcoma, chondrosarcoma

65
Q

What are 4 possible complications of chronic osteomyelitis?

A

1) Pathological fracture and deformity
2) Secondary amyloidosis
3) Sepsis or distant spread
4) Malignant transformation

66
Q

What are the risk populations for tuberculous osteomyelitis?

A

1) Very young
2) Old
3) Immunosuprressed
4) Developing nations
5) Lower socioeconomic groups

67
Q
A
67
Q

What are 3 complications of tuberculous osteomyelitis in the vertebral spine?

A

(Most common in thoracic and lumbar)
1) Compression fracture
2) Severe deformities (scoliosis, kyphosis)
3) Neurological deficits due to cord and nerve compression

Musculoskeletal System (15 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions