Radiological sign in case of Pehe's disease ?

Ans. is 'b' i.e., PA factor positive Seronegative spondvloahropathies The seronegative spondyloahropathies are a group of disorders that share ceain clinical features and genetic associations. The word seronegative referes to the absence of rheumatoid factor in this group of disorders. The seronegative spondyloahropathies include ? Ankylosing spondylitis Reactive ahritis --> Reiter syndrome and enteritis associated ahritis Psoriatic ahritis Ahritis associated with inflammatory bowel disease, i.e. enteropathic ahritis Features of seronegative spondyloahropathies o Onset usually before 40 years Absence of RA factor HLA - B27 positive Presence of uveitis