Rheumatology & MSK Flashcards
what is the most common arthritis?
osteoarthritis
who gets osteoarthritis?
older females overweight excessive joint use trauma/malalignment etc
how do you end up with bony changes in osteoarthritis?
mechanical forces –> cartilege lost
cartilege loss = cytokines - TNFa, IL-1, NO
cytokines = cartilege cannot repair properly
loss of cartilege = bone rubbing on bone
reactive changes in bone, it is not designed to rub on bone
reactive changes you see in the bone in osteoarthritis?
loss of joint space osteophytes sclerosis subchondral cysts synovial hypertrophy
what is sclerosis in relation to arthritis?
thickening and widening of the bone at the joint
what is an osteophyte?
an area of bone which has been reactively laid down in the wrong place
what joints might be affected in osteoarthritis? (give 5)
those that are used a lot! knees hips sacro ileac cervical spine wrist carpmetacarpal - base of thumb DIP PIP
how is the pain different in osteooarthritis vs inflammatory arthritis?
osteo - morning stiffness only lasting up to 15 mins, generally worsens throughout day
RA - - stiff for 30+ mins, better with use
apart from pain, give 3 other clinical presentations of osteoarthritis?
effusion crepitus pt reports the joint 'gives way' tender to palpation deformity herbedens/bouchards nodes
what are herbedens and bouchards nodes?
soft tissue swellings on the fingers seen in the early stages of osteoarthritis herbedens = DIP bouchards = PIP (HD AND BP)
when would arthroscopy be indicated?
knee ‘locking’ indicates a loose body which can be removed (arthroscopy)
4 x ray changes typical of osteoarthritis?
LOSS L - loss of joint space O - osteophytes S - subchondral sclerosis S - subchondral cysts
some management options of osteoarthritis?
physio weight loss occupational therapy eg footwear, walking aid nsaid opioid amytriptiline topical capsaicin steroid injection hydroxychloroquine
what produces synovial fluid?
the synovial membrane
typical patient with RA?
post menpausal woman
smoker
past infection
what is the pathophysiology of RA?
a reaction to self antigens eg type II collagen, vimentin
= inflammation at the synovial membrane
= damage to soft tissue and cartilege
= damage to bone
what joints are affected in RA?
small joints
symmetrical
hands, wrists & feet
not DIP or spine
if you were examining the hands of someone with RA give 5 things you might expect to see?
DIP not affected hurts to squeeze the joints joints are warm ulnar deviation cannot make a fist z thumb swan neck deformity
are there any systemic features of RA?
myalgia, malaise and low grade fever, if the cytokines go around the body Rheumatoid nodules - skin eye inflammation eg scleritis ihd/pericarditis lung inflam
3 blood tests you could do if you suspect RA?
ESR/CRP
rheumatoid factor - low sensitivity and specificity
anti-CCP (anti- cyclic citrillunated peptide) - good specificity, sensitive enough to highlight the most severe disease
some bony changes you might see on x ray in RA?
you dont see bony changes on x ray immediately!
soft tissue swelling
periarticular ostoepenia (low bone density)
loss of joint space
subluxation
erosion
3 drugs you could give in RA?
Methotrexate sulphasalazine hydroxychloroquine infliximab short term NSAID
who gets gout?
men over 40 - esp diabetes, overweight, hypertension purine rich diet renal impairment IHD diuretics
what enzyme converts hypoxanthine to xanthine and xanthine to uric acid?
xanthine oxidase