Table 1

Intraobserver reproducibility for individual radiographic features among the three observers for the Osteoarthritis Research Society (OARS) and line drawing atlases. The mean of the three intraobserver κ coefficients is shown, with the range for the individual observer κ coefficients in parentheses

Radiographic features OARS atlas Line drawing atlas
Lateral tibiofemoral JSN1-150 0.76 (0.66–0.80)0.76 (0.55–0.83)
Medial tibiofemoral JSN0.75 (0.70–0.79)0.78 (0.72–0.86)
Lateral patellofemoral JSN0.68 (0.55–0.80)0.82 (0.77–0.89)
Medial patellofemoral JSN0.68 (0.50–0.82)0.82 (0.73–0.89)
Average JSN of four compartments0.72 (0.65–0.78)0.82 (0.78–0.89)
Lateral femoral osteophyte0.57 (0.49–0.63)0.60 (0.43–0.87)
Lateral tibial osteophyte0.68 (0.65–0.73)0.72 (0.70–0.76)
Medial femoral osteophyte0.71 (0.70–0.71)0.66 (0.55–0.76)
Medial tibial osteophyte0.63 (0.58–0.67)0.63 (0.59–0.66)
Lateral patellar osteophyte0.69 (0.63–0.76)0.70 (0.65–0.73)
Lateral trochlear osteophyte0.76 (0.72–0.79)
Medial patellar osteophyte0.58 (0.51–0.57)0.59 (0.52–0.59)
Medial trochlear osteophyte0.69 (0.61–0.73)
Average osteophyte of all sites0.65 (0.62–0.68)0.68 (0.63–0.71)
  • 1-150 JSN = joint space narrowing.