Fig. 2
From: Femoral-head vascularity after hip surface arthroplasty
Preoperative bone scintigraphy image and radiograph of a patient with ankylosing spondylitis (a); postoperative images 8 months after surgery (b). Surface arthroplasty was planned on the right side but could not be carried because the left hip could not be dislocated. The resurfaced head showed 38% of the preoperative uptake (after correction for attenuation) and was categorized as showing reduced vascularity