Corrections - MSK Flashcards
What are the different patterns of psoriatic arthropathy?
1) symmetric polyarthritis (30-40%) - most common type
2) asymmetrical oligoarthritis: typically affects hands and feet (20-30%)
3) sacroiliitis
4) DIP joint disease (10%)
5) arthritis mutilans (severe deformity fingers/hand, ‘telescoping fingers’)
Signs seen in psoriatic arthritis?
1) joint disease
2) psoriatic skin lesions
3) periarticular disease
4) nail changes: pitting, onycholysis
Mechanism of injury of posterior dislocation of hip?
Direct longitudinal impact onto a flexed hip (i.e. sitting in a car)
How will leg appear in posterior dislocation of hip?
- Leg will appear shortened
- Leg will be flexed, internally rotated, and adducted
Features of optic neuritis?
- pain on movement
- reduced visual acuity
- an RAPD due to reduced response to light of the afferent pathway in the affected eye
What is reactive arthritis?
Is typically a consequence of an infection elsewhere in the body such as the genitourinary or GI tract.
Its onset is usually acute with asymmetric lower limb oligoarthritis being common.
What is pseudogout?
A form of microcrystal synovitis caused by the deposition of calcium pyrophosphate dihydrate crystals in the synovium.
Cause of gout vs pseudogout?
Gout: caused by monosodium urate monohydrate crystals
Pseudogout: caused by calcium pyrophosphate (CPP) crystals
What is pseudogout strongly associated with?
Increasing age
Patients who develop pseudogout at a younger age (e.g. < 60 years) usually have some underlying risk factor.
What are some risk factors?
- haemochromatosis
- hyperparathyroidism
- low magnesium, low phosphate
- acromegaly, Wilson’s disease
What joints are most commonly affected in pseudogout?
- wrist
- knee
- shoulders
Characteristic xray finding in pseudogout?
Chondrocalcinosis: in the knee this can be seen as linear calcifications of the meniscus and articular cartilage
What is chondrocalcinosis?
the finding of calcification of the articular cartilage
What 4 conditions are associated with HLA-B27?
1) ankylosing spondylitis
2) IBD
3) psoriatic arthritis
4) reactive arthritis
Management of acute RA flare?
IM steroids e.g. methylprednisolone
What is reactive arthritis?
An arthritis that develops following an infection where the organism cannot be recovered from the joint.
E.g. following an STI
What triad is seen in reactive arthritis?
1) urethritis
2) conjunctivitis
3) arthritis
‘can’t pee, can’t see, can’t climb a tree’
What STI can cause reactive arthritis?
Chlamydia trachomatis
Give some risk factors for osteoporosis
- history of glucocorticoid use
- rheumatoid arthritis
- alcohol excess
- history of parental hip fracture
- low body mass index
- current smoking
These are risk factors that are used by major risk assessment tools such as FRAX.
What medications can worsen osteoporosis?
- glucocorticoids
- SSRIs
- antiepileptics
- proton pump inhibitors
- glitazones
- long term heparin therapy
- aromatase inhibitors e.g. anastrozole
What is typically the 1st sign of systemic sclerosis?
Raynaud’s
What is systemic sclerosis?
Systemic sclerosis is a condition of unknown aetiology characterised by hardened, sclerotic skin and other connective tissues.
What joint disease is squaring of the thumb seen in?
OA
Classic patient with ankylosing spondylitis?
A young male with lower back pain and stiffness of insidious onset, which is worse in the morning and moves with exercise.
Characteristic changes in psoriatic arthritis?
- Dactylitis
- DIP swelling
- spinal stiffness
- reduced cervical spine mobility
Note a patient can have psoriatic arthritis without having psoriatic skin changes.
What scoring system is a measure of disease activity in rheumatoid arthritis?
The DAS28 score
What is spinal stenosis often relieved by?
Spinal stenosis is often relieved by sitting down or leaning forward
Patients will often find walking uphill easier.
How does spinal stenosis present?
Spinal stenosis typically presents with back pain that might radiate to the thigh and/ or calves.
Risk factors for spinal stenosis?
previous back surgery and manual labour.
What are 4 key risk factors for avascular necrosis of the hip?
1) long term steroid use
2) chemo
3) alcohol excess
4) trauma
What is CREST syndrome?
CREST syndrome is a subtype of limited systemic sclerosis and includes:
- calcinosis
- Raynaud’s phenomenon
- oesophageal dysmotility
- sclerodactyly
- telangiectasia
What medications can cause thrombocytopenia?
- quinine
- abciximab
- NSAIDs
- diuretics: furosemide
- antibiotics: penicillins, sulphonamides, rifampicin
- anticonvulsants: carbamazepine, valproate
- heparin
What is polymyositis?
An inflammatory disease commonly caused by Anti-Jo-1.
Who does polymyositis typically present in?
typically presents in male patients >40 years
How does polymyositis typically present?
- symmetrical proximal muscle weakness
- raised creatine kinase as a result of muscle breakdown
- absence of a rash
How is polymyositis typically treated?
corticosteroids and/or immunosuppressants such as methotrexate.
Pain in scleritis vs episcleritis?
Scleritis: can be very painful
Episcleritis: episclera becomes inflamed and red but NO pain (gritty sensation)