Spondyloarthropathy: Sero negative spondyloarthropathy is a possibity. Shares many features symptomatically with as, but without hla-b27 positive. If your back pain is associated with sacroiliac pain (buttock pain to back of thigh, maybe groin, but not past knee) then it would be suspect. This is one if those cases where specialist eval would help. Rheumatology is best suited for diagnosis and treatment.
Answered 12/12/2014
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