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Clinical assessment of seronegative spondyloarthritis
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Seronegative:
- Rheumatoid factor and other autoantibodies usually negative
- ± ↑ ESR/CRP
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Axial disease physical exam:
- Lumbar flexion deformity assessed by modified Schober’s test:
- ⊕ if <5 cm ↑ in distance between a point 5 cm below the lumbosacral junction and another point 10 cm above when going from standing to maximum forward flexion
- T-spine mobility (extension) and kyphosis severity measured by occiput-to-wall distance (although occiput-to-wall distance can also be increased in osteoporotic kyphosis)
- Lumbar flexion deformity assessed by modified Schober’s test: