Normal CBC, CMP, CRP.
ESR 37 (normal < 20)
HLA B27 positive (normal negative)
Radiographs age 12 showed normal pelvis and hip joints without avascular necrosis or slipped capital femoral epiphysis.
Repeat radiographs age 15 showed subtle changes within the femoral heads and necks that may be associated with hip impingment.
MRI showed bilateral acute on chronic sacroiliitis and diffuse asymmetic enthesopathy with edema at the muscle attachments involving the bilateral ischial tuberositis, left anterior superior iliac spine, greater and lesser trochanters, and no evidence of femoral-acetabular impingment.
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