MSK Flashcards
Causes of primary vasculitis
Large
Medium
Small
L -> giant cell / Takayasu
M -> PAN, kawasaki
S -> HSP, Wegener’s, Churg-Strauss, microscopic poyangitis
Causes of secondary vasculitis
aortitis in RA
autoimmune, malignancy, drugs, infection
Eg of infective / drug / autoimmune causes of secondary vasculitis
Infective -> BBV, strep
Drugs -> penicillin, steroids
Autoimmune-> RA, SLE, Sjogrens
ANCA assos vasculitis?
Wegener’s
microscopic poyangitis
Churg-Strauss
What is ANCA?
how detected?
2 types?
Anti-neutrophil cytoplasmic antibodies
detected with indirect immunofluorescence microscopy
c-ANCA (cytoplasmic)
p-ANCA (peri-nuclear)
Pres of wegeners?
Nasal/sinus problems - epistaxis; saddle-nose deformity
Lungs - haemoptysis
Kidneys - rapidly progressing glomerulonephritis
+/- conductive hearing loss, arthritis, subcutaneous nodules, neuropathy
c-ANCA / PR3 = ?
Wegeners –>
now should instead be called ‘granulomatosis with polyangitis’
p-ANCA / MPO = ?
Churg-Strauss
Triad of affected areas in Wegeners?
lung
kidney
ENT
usual vasculitis with raised eosinophils?
Churg-strauss
–> often get new onset / worsening asthma
New name for Wegeners?
granulomatosis with polyangitis
Who does wegeners affect?
Men 25-60
Causes of cavitation on CXR?
wegeners, malignancy, TB, klebsiella
alternate name for churg strauss?
Eosinophilic granulomatosis with poyangitis
Pres of churg-strauss
Lungs - new/worsening asthma, pulmonary infiltrates, alveolar haemorrhage
CNS - neuropathy
ENT - polyps, conductive hearing loss, allergic rhinitis
Skin - purpura, nodules
RENAL DISEASE IS RARE
How to differentiate wegeners/churg-strauss?
wegeners affects kidneys (c-ANCA)
eosinophilia in churg (p-ANCA)
Mx of Churg-Strauss / Wegners?
Induce remission [high dose steroids + cyclophosphomide/Rituximab]
Maintain remission [MTX + pred + folic acid]
Features of HSP
children IgA purpuric rash arthritis abdo pain glomerulonephritis
Features of polyarteritis nodosa
Medium vessel
Aneurysms
Mx of GCA?
if no visual sx?
if visual sx?
Prednisolone
40mg if no visual disturbance
60mg if visual disturbance
Condition linked to GCA?
polymyalgia rheumatica
Sx of GCA
headache, severe, sharp, dull throbbing, (won’t stop without steroids)
TA -> swollen, tender, pulseless
Features of PMR
shoulder/pelvic pain
morning stiffness
weakness on exertion (due to pain)
ix in PMR?
r/o?
ESR/CRP RhF/Anti-CCP ANA CK - to r/o muscle pathology eg polymyositis TFT
Mx of PMR
Prednisolone 15mg
Bone protection
PPI
Vasculitic screen?
FBC Urinalysis ESR/CRP LFTs ANCA CXR Biopsy
How to describe fracture?
Complexity Type (FIG-TACOS) Comminution Location Displacement
what is FRAX score for?
10 year risk of fracture
Age, sex, BMI
Prev fracture, FH fracture, low femoral neck BMD
Alcohol, smoking, glucocorticoids
RA, secondary osteoporosis
2 fractures which can lead to avascular necrosis?
femoral head
scaphoid
what is a colles fracture?
distal radius with dorsal displacement of fragments
(fall onto wrist in extension)
FOOSH
Mx of wrist fracture
reduction via manipulation + anaesthesia
immobilise -> avoid full cast initially due to swelling
Sign of scaphoid fracture
tenderness in anatomical snuffbox
what runs through anatomical snuff box
Radial nerve - sensory branch
comps of Colles?
median nerve damage
Fall backwards?
what is opposite of Colles?
Smiths fracture (fall onto flexed wrist) distal fracture of radius with ventral displacement
Garden spade deformity
Seen on lateral X-Ray of colles?
dinner fork sign
How does NOF fracture present
affected leg shortened, adducted and externally rotated
main types of NOF fracture?
which is worse?
intracapsular
extra-capsular
intra = worse -> avascular necrosis more likely
Ix in fractured NOF
AP + lateral X-Ray
FBC, cross match, U+Es, glucose, ECG
Mx of intracapsular fracture
analgesia (NOT NSAIDs)
surgery in 1d
when to X-Ray an ankle?
ottawa ankle rules
> 55
Inability to wt bear
Bony tenderness
Mx of ankle fracture if dislocated
reduce immediately under sedation
Signs of compartment syndrome?
pain out of proportion
+ signs of compartment syndrome
-> pain, paraesthesia, pallor, paralysis, pulseless, perishingly cold
mx of compartment syndrome
fasciotomy
stages of fracture healing
- haematoma
- soft callus
- bony callus
- bone remodelling
what is frozen shoulder?
thickening and contraction of glenohumeral joint capsule +/- adhesions
pres of frozen shoulder
pain + loss of function
-> external rotation lost
osteoporosis?
low bone mass + micro-architectural deterioration leading to fragility and fracture risk
DEXA for osteoporosis?
osteopenia?
Osteoporosis < - 2.5SDs
-2.5
Pathogenesis of osteoporosis?
increased osteoclast
decreased osteoblast
osteoporotic fractures
spine
distal radius
NOF
pelvis
secondary RFs for osteorporosis
SHATTERED Steroids Hyper -thyroid; -PTH Alcohol/tobacco Thin Testosterone decreased Early menopause Renal/liver function Erosive/inflam disease Dietary
Why do steroids increase risk of osteoporosis?
Decreased Ca absorption from gut
increased osteoclast
decreased muscle mass
DDx in osteoporosis
myeloma
ix in osteoporosis
FBC, ESR, CRP
Bone profile (NAD in osteoporosis)
U+Es, LFT, TFT, Ca
Serum Ig
Mx for osteoporosis
lifestyle (exercise, stop smoking+alcohol)
Calcium+Vit D
Bisphosphonates
Fall prevention?
avoid polypharmacy
alternative medication if intolerant of bisphosphonates
Denosumab
monoclonal antibody to RANKL
how do bisphosphonates work
inhibit osteoclasts
SEs of bisphosphonates
oesophagitis
gastric ulcers
osteonecrosis of the jaw
osteomalacia?
disorder of mineralisation due to Vit D deficiency
In kids = Rickets
Functions of Vit D?
Bone - increase Ca mobilisation, increase osteoclast
Intestine - increase Ca absorp, PO4 absorp
Decreases PTH
PTH mech?
Bone - increase osteoclasts
Kidney - increase 1,25vD3 + decrease Ca excretion + increase PO4 excretion
What stimulates PTH
low Ca
Pres of Rickets
leg bowing, knock knees, softening of skull, frontal bossing, waddling gait
widespread bone pain + tenderness
Paget’s disease of bone?
increased bone turnover
Lytic - osteoclasts
Sclerotic - rapid bone formation by osteoblasts -> deformed
Where affected by Paget’s?
axial skeleton
sx in pagets
bone pain
deformity
comps of pagets
pathological fractures + lots of bleeding (vascular)
deafness/tinnitus
ix in pagets
ALP - high
(Ca, PO4, PTH normal)
isotope bone scans
XR of pagets?
osteolysis and osteosclerosis
‘blade of grass lesion’
‘cotton wool pattern’ in skull
mx pagets
NSAIDs
bisphosphonates
inflam vs degenerative arthritis?
inflam -> ease on use, stiff in morning (>60mins), hot and red, responds to NSAIDs, swelling
Degenerative -> worse with use, morning (<30mins), no swelling, not inflamed, ‘gelling’
joints affected in OA
knees, hips, thumb base, spine
signs of OA
reduced ROM
crepitus
pain on movement
heberdens, bouchards
XR of OA
Loss of jt space
Ostophytes
Subchondral cysts
Subchondral sclerosis
Mx of OA
lifestyle
analgesia
+/- intra-articular steroids (methyl prednisolone)
+/- replacement [arthroplasty], fusion [arthrodesis]
RA XR?
Loss of jt space
Erosions
Soft bones
Soft tissue swelling
What is formed in proliferation of RA
pannus
extra-articular pres of RA
rheumatoid nodules vasculitis pleuritic chest pain eye problems neuro anaemia of chronic disease
Ix in RA
RhF
Anti-CCP
Xray hands + feet
Mx of RA?
physio
- DMARD
- biologics
how often give MTX
weekly
SEs of MTX
bone marrow suppression
mouth ulcers
pulmonary fibrosis
monitoring in MTX
CXR, FBC, LFT, U+Es
biologics used in RA
Anti-TNFa
infliximab, adalimumab, enteracept
when can you give biologics in RA
failure to respond to 2xDMARDs after trials of 6months
RFs for gout
alcohol, purine rich foods, fructose, diuretics, DM, CKD, CHD, HTN,
ix in gout
serum urate (can be N) joint aspiration XR
seen on joint aspiration in gout
negatively birefringent needles of mono sodium urate
mx of acute gout
NSAID - naproxen
+/- colchicine
prophylaxis in gout
lifestyle
allopurinol / febuxostat
crystal in pseudogout?
where common?
calcium pyrophosphate
knee/wrist
mx pseudogout
RICE
NSAIDs
IA steroid injection
antibodies in SLE?
ANA
genetics in SLE?
HLA DR2/DR3
common pres of SLE
raynauds
Drug mx of SLE
hydroxychloroquine
signs of SLE
Oral ulcers Photosensitive rash arthritis malar rash seizures/psychosis ESR raised (CRP normal) renal disorder pleuritis/pericarditis
ix in SLE
autoantibodies [ANA, anti-dsDNA, antiSmith] Complement [low C3+C4] ESR raised, CRP normal FBC Urinalysis U+Es CXR ECG
mx of joints in SLE?
NSAID, hydroxychloroquine, steroids
mx of kidney/neuro sx in SLE?
cyclophosphamide
antibody in antiphospholipid syndrome
anti-cardiolipin
pres of antiphospholipid
thrombosis, DVT, recurrent miscarriages, pre-eclampsia, thrombocytopenia, stroke
mx of antiphospholipid
warfarin (aim 2-3)
lifestlye -> avoid smoking, COCP, poor diet, alcohol
clotting studies of antiphospholipid?
paradoxically low platelets
prolonged APTT
gene in Sjogrens
HLA DR3
complex in Sjogrens
sicca complex diminished lacrimal and salivary glands
pres of sjogrens
dry eyes
dry mouth
enlarged parotid
ix in sjogrens
schirmer tear test
autoantibodies
sialography
biopsy salivary gland
mx of sjogrens
artificial tears
oral pilocarpine
joint involvement -> NSAID + hydroxychloroquine + steroid
sx of limited sclerosis
CREST Calcium deposits in skin Raynauds Esophageal dysfunction Scleordactyly Telangiectasia
+ fatigue, wt loss
Features of systemic sclerosis
pulm HTN
GI bleed
Renal crisis
ix in systemic sclerosis?
spirometry CXR autoantibodies - ANA ECG FBC U+E Barium swallow if oesophageal disorder
drug for raynauds
nifedipine
mx of pulm HTN/fibrosis in systemic sclerosis
sildenafil
cyclophosphamide
monitoring in systemic sclerosis
BP (weekly)
spirometry (annually)
pres of polymyositis?
not painful, progressive symmetrical proximal muslce weakness (chair, stairs, hair) pharyngeal weakness (dysphagia)
ix of polymyositis?
CK elevated x 50
autoantibodies - anti-Jo1
muscle enzymes - LDH
muscle biopsy
what is the worry with polymyositis?
what ix?
can be paraneoplastic (lung, ovarian, bowel)
Ca125, Ca19-9, CEA
CXR
Pres of dermatomyositis?
rash, purple scaly patches on extensors -> Gottron’s papules
nailfold erythema
fever, weight loss,
ix in dermatomyositis
CK, LDH, aldolase
autoantibodies -> Anti-Mi2, ANA
EMG + muscle biopsy
mx of polymyositis and dermatomyositis?
if lungs involved?
steroids
if fail -> immunosuppresants
lungs -> cyclophosphamide
features of Ehler-Danos
increased elasticity + fragility of skin
hypermobile joints
mitral valve prolapse, aortic root dilatation
mx of Ehler-Danos
physio, regular gentle exercise, genetic counselling
echo screening for heart comps (MV prolapse, aortic root dilatation)
gene in Marfans
AD fibrillin gene
usual cause of death in Marfans
aortic root dilatation and aortic dissection
features of Marfans
hypermobility
arachnodactyly
pectus excavatum
high arched palate
pneumothorax
aortic dilatation/dissection
mitral regurgitatoin
closed angle glaucoma
monitoring in marfans
annual echo
CV MRI every 5years
prophylactic medication in marfans
propanolol
sero-negative arthropathies?
where do they effect?
RhF -ve
axial skeleton, peripeheral joint, enthesitis and dactylitis
Anterior uveitis, IBD
gene in seronegative arthropathies
HLA B27
egs of seronegative arthropathies
ankylosing spondylitis Reiter's syndrome enteropathic arthritis psoriatic arthritis Behcet's disease JIA OA
features of ankylosing spondylitis?
<40 onset
inflammatory back pain + enthesitis
tender sacroiliac region, limited spinal RoM
peripheral enthesitis -> achilles, plantar fascia
peripheral arthritis -> asymmetrical
extra articular sx of ankylosing spondylitis
eyes -> ant uveitis
CV -> aortitis, AR
Lung -> apical fibrosis
o/e ankylosing spondylitis
reduced chest expansion
schober’s test -> reduced forward flexion + loss of lumbar lordosis
reduced lateral flexion
ix in ankylosing spondylitis
HLA-B27
XR whole spine
Spirometry
Pelvic XR -> sacroiliitis
associations with ankylosing spondylitis
A's Apical fibrosis Anterior uveitis Aortic regurg Achilles tendonitis AV node block Amyloidosis
Mx for ankylosing spondylitis
physio + rehab + exercise
NSAIDs
steroids/sulfasalazine for tendon/joint involvement
mx of enthesitis in ankylosing spondylitis?
intra-articular corticosteroid injection
mx of peripheral arthritis in ankylosing spondylitis
DMARD - sulfasalazine
Most common joint in psoriatic arthritis
DIPJ
(+nail changes)
remember that closest to the nail..
XR of feet/hands in psoriatic arthritis?
erosion in DIP
‘pencil in cup’ deformity
periarticular new bone formation
ix in psoriatic arthritis?
RhF -ve
Anti-CCP -ve
ESR/CRP
Mx of psoriatic arthritis?
if limited -> NSAID + physio +/- joint injection
if severe -> DMARD (methotrexate)
When does reactive arthritis occur?
egs
1-4 weeks post GI/GU infection
eg. chlamydia, campylobacter, salmonella, shigella
sx of reactive arthritis
conjunctivitis
urethritis
post-infectious arthritis
“cant see, cant wee, cant bend your knee”
ix in reactive arthritis?
ESR, CRP, FBC
joint aspiration -> r/o septic/crystal arthropathies
serology
cultures
mx of reactive arthritis?
NSAID + rest +/- intra-articular steroids
+/- abx -> azithromycin for chlamydia
enteropathic arthritis?
arthritis assos with IBD or coeliac
mx of enteropathic arthritis?
sulfasalazine
Behcet’s disease?
Genetics?
recurrent oral ulcers
joints -> non-erosive arthritis (lower limb)
HLA B51
mx of Behcet’s disease?
topical corticosteroids
systemic steroids
pres of Takayasu’s vasculitis?
aka pulseless disease
young women 20-40
chronic, progressive, inflammatory, occlusive disease of aorta and branches
stages of Takayasus?
systemic: fever, fatigue, wt loss, arthralgia, tender arteries
occlusive: limb claudication, TIA, HTN, angina
o/e takayasus?
SBP differs between arms
impalpable peripheral pulse
arterial bruits + AR
ix in takayasus
ESR>50
aortic angiography
mx takayasus?
glucocorticoids + aspirin + bone protection
2nd line = TNFa
Polyareteritis nodosa (PAN) association?
HBV
what is PAN?
necrotising inflammation of M / S arteries
pres of PAN?
nerves - mononeuritis
skin - purpura, nodules, ulcers
GI - post prandial pain (from ischaemia)
renal - HTN
ix in PAN?
Look for Hep B (HBsAg)
p-ANCA (negative)
arteriography
biopsy
mx of PAN?
prednisolone +/- cyclophosphamide
Causes of septic arthritis?
S. aureus
GBS
gonorrhoea
RFs for septic arthritis
prosthetic joint IVDU DM skin infection immunocomp
ix in septic arthritis
joint aspiration for MC+S, gram stain
blood cultures
mx of septic arthritis
surgical drainage + lavage
IV abx
which abx in septic arthritis?
Gonorrhoeal
Staph
MRSA
Gon -> vancomycin/ceftriaxone
Staph -> fluclox
MRSA -> vancomycin
what is Pott’s disease?
vertebral osteomyelitis from haematogenous spread of TB -> abscess
ix osteomyelitis
X-ray
FBC
Blood cultures
bone culture
seen on XR of osteomyelitis
dark, soft tissue swelling, periosteal thickening, patchy osteopenia
mx of ostemoyelitis
bone/soft tissue debridement
stabilise + immobilise
IV abx
mx of fibromyalgia
amitryptiline + CBT
Red flags of back pain
TUNA FISH Trauma Unexplained wt loss Neuro sx Age >50 / <20 Fever+night sweats Immunocomp Steroids Hx of cancer
Main worries in back pain
Cauda equina
multiple myeloma
metastatic cancer
psoas abscess
usual cause of cervical back pain
cervical spondylosis
pres of cervical spondylosis
neck pain
+ radiculopathy
+myelopathy
ix cervical spondylosis
XR
MRI
pres of disk prolapse
pain localised to spine + radiculopathy, sensory disturbance in dermatomal distribution
Differentiate pain between spinal fracture and Ca/infection?
spinal fracture: sudden onset pain relieved by lying down
Cancer/infection -> pain REMAINS on lying down, night pain
mx of herniation disk?
active!
analgesia
discectomy if severe nerve compression
What is osteoid sarcoma?
dense osteoid, cancer in young adults (15-19yo)
Ewings sarcoma?
primitive neuroectodermal tumour
who gets ewings sarcoma?
15yo boy
pres of ewings sarcoma?
mass or swelling on long bones
ewings on XR?
bone destruction with onion skin layers of periosteal bone formation
mets to bone?
lytic lesions?
sclerotic lesions?
both?
lytic - myeloma [pepperpot skull]
sclerotic - prostate
both - breast
Mx of NOF fracture
ABCDE
analgesia + nerve block
VTE prophylaxis
early surgery -> mobilise on day 1, physio