Natural Progress of a Bone Scan After Cementless Hydroxyapatite-Coated Total Hip Arthroplasty

Visual Pattern and Serial Quantitation of 18F-Sodium Fluoride PET/CT in Asymptomatic Patients After Hip and Knee Arthroplasty

“…However, after 6 months, there was no difference in the uptake ratio between the areas. These findings correlate well with previous results from a 99m Tc-MDP bone scan study [5]. The uptake in the hydroxyapatitecoated zone was significantly higher than in the noncoated zones (p < 0.05) in the first 3 months.…”

“…The acetabulum also showed a higher uptake ratio than the proximal femur. In the patient group, the uptake ratio in the femoral stem and the acetabular cup decreased between 1 and 3 months after surgery and stabilized after that time [5]. In another study using 99m Tc-HEDP, the uptake ratios showed a changing pattern during the postoperative period from 3 to 12 months in asymptomatic patients [11].…”

“…Several studies have addressed the changing pattern in uptake intensity during the natural postoperative course. 99m Tc-MDP bone scintigraphy was performed in 62 asymptomatic patients (80 joints) after cementless hydroxyapatite-coated total hip arthroplasty, and ten healthy controls who had not undergone surgery, from 1 to 48 months [5]. In the control group, the metaphyseal area in the proximal femur showed a physiologically higher uptake ratio than the diaphyseal area.…”

“…1). The Gruen zones were divided into hydroxyapatite-coated areas (zones 4 and 10) and noncoated areas (zones 5-9) [5]. Six regions of interest were demarcated on the knee prostheses: three femoral zones (zones 1-3) on the sagittal view and three tibial zones (zones 4-6) on the coronal view.…”

“…The manuscript has not been published previously, is not under consideration for publication elsewhere, and has been approved by all of the authors. bone scans [3][4][5][6]. Kim et al evaluated the degree of uptake within the five periprosthetic zones of a hip joint on sequential bone scans using a visual grading system.…”