Flashcards in Spondyloarthropathies Deck (28):
Question mark spine
Hallmarks of spondyloarthropathies
Sacro-iliac and spine involvement
Enthesitis- inflammation at innervation of tendons into bones
Inflammatory arthritis- affecting a few joints, asymmetric, predominantly lower limb
Dactylitis- sausage digits- inflammation of the whole digit
What is a spondyloarthropy
Inflammatary arthritic condition that mainly affects the spine, particularly in genetically predisposed individuals (HLA B27)
Associated with ankylosing spondylitis, psoriatic arthritis, reactive arthritis, Crohns disease and uveitis.
Genetic autosomal dominant test- doesnt offer diagnosis due to background population can carry the gene without it being pathological.
Over time- if ankylosing spondylitis is left, what can happen?
Spinal fusion meaning the patient will have a question mark shaped back. Also hip and knee arthritis can develop. Loss of lumbar lordosis (the normal curvature of the spine) and increased thoracic kyphosis (excessive curvature).
Which investigations can be done into ankylsing spondylitis?
Examination is key- tests include
Tragus/occiput to wall
Chest expansion (costovertebral joints may be affected)
Modified Schober test
Blood tests include- inflammatory parameters- ESR, CRP
HMA B27- generally not used but still
X-rays showing sacralitis, syndesmophytes (bony outgrowths in the spine due to erosion) and bamboo spine (vertebral body fusion).
Modified Schober test
This involves measuring 5cm below the posterior superior iliac crests and 10cm above, whilst the patient is upright, then asking them to bend forwards and remeasuring the distance. In normal situations it should extend beyond 20cm.
Occiput to wall test
Patient puts heels, bum and shoulders against wall and is asked to lean head back. Shows the extension of the neck. Normal people wouldn't have an issue with this.
Xray findings of ankylosing spondyitis
Early signs will not be seen on Xray
Long term disease will show sclerotic sacrum (whitening on X-ray)- may show syndesmophytes
Bone density reduces in late disease
Fusion of the spine.
MRI findings of ankylosing spondyitis
May show enthesitis and bone marrow oedema.
Treatment of AS
Main treatment is physiotherapy to stop spinal fusion.
Then use NSAIDs e.g. naproxen (in tayside), you have to offer gastroprotection with this.
Use disease modifying drugs if there is also peripheral joint involvement e.g. methotrexate.
Biologics reduce inflammation- anti TNF treatment- infliximab
Or new on the market- Secukinumab (anti IL-17)
Inflammatory arthritis associated with psoriasis. However sometimes the joint involvement comes first.
Occurs in up to 30% of psoriasis patients.
Clinical features of psoriatic arthritis
Usually an asymmetrical oligoarthritis.
May affect the hands in a similar pattern to rheumatoid arthritis.
Spondylitis- inflammation of joints of the spine.
Enthesitis- inflammation at insertion of tendon to bone. Commonly achilis tendonitis, plantar fascitis.
Dactylitis- sausage digits
Nail involvement- pitting, oncholysis
Extra articular features- eye disease.
Diagnosis of psoriatic arthritis
Exam- look for nail and skin signs.
Bloods- inflammatory markers will be raised. Also it will be negative for rheumatoid factor (this would only be tested in someone who had symmetrical arthritis)
X-rays- will show marginal erosions and whiskering
Pencil in cup deformity
Treatment of psoritic arthritis
Disease modifying drugs e.g. methotrexate. If two disease modifying drugs don't work try biologics.
Non medical treatment- physiotherapy
Infection induced systemic illness characterised primarily by an inflammatory synovitis from which viable organisms cannot be cultured.
Most common infections causing reactive arthritis
Genitourinary- e.g. chlamydia or GI infections such as campylobacter and salmonella.
Pathogenesis (brief) of reactive arthritis
Infection occurs. Then 1-3 weeks later the arthritis ensues. It tends to affect large joints such as the knee. The infection could have been anywhere else in the body, not necessarily at site of arthritic disease.
The patient will be HLA B27 positive
Who does reactive arthritis tend to affect?
20-40 year olds.
A form of reactive arthritis . They will get all three of urethritis (inflammation of the urethra), conjuntivitis/Uveitis/Iritis, arthritis
Clinical features of reactive arthritis
Fever, fatigue and malaise
Asymmetric monoarthritis or oligoarthritis
Mucocutaneous lesions- e.g. hyperkeratotic nails, onycholysis (lifting of the nail from the nail bed), painless oral ulcers, Keratodema Blenorrhagica (skin lesions commonly found on the soles of hands/feets
If the individual is still recovering from infection they are likely to also be unwell.
Diagnosing reactive arthritis
Bloods- inflammatory markers will be raised- ESR, CRP,
FBC and U&E's.
Cultures of the blood, urine and stool
Joint fluid analysis (just to check for septic arthritis)
X-ray of affected joint.
Treatment of reactive arthritis
90% resolve spontaneously within 6 months
Corticosteroids (once sepsis is ruled out)- oral, intra-articular, eye drops
Antibiotics for underlying infection.
DMARDs- if resistant/chronic
Non medical- physiotherapy and occ therapy.
Inflammatory arthritis associated with IBD (Crohn's or Ulcerative colitis)
Patients present with arthritis in several joints including the knees, ankles, elbows, wrists. Sometimes in the spine and elbows.
Symptoms of enteropathic arthritis tend to be worse...
In flare ups of the IBD.
Symptoms (multisystem) of enteropathic arthritis
GI- loose watery (blood and mucous in) stools
Eye involvement- uveitis
Skin involvement- pyoderma gangernosum
Enthesitis- archilles tendon, plantar fascitis
Oral- apthous ulcers
Investigations into enteropathic arthritis
Upper/lower GI endoscopy
Joint aspiration- showing no organisms
Raised inflammatory markers
Xray/MRI showing sacrolitis
Utrasound showing synovitis/tenosynovitis