Table 1.

Inter- and intrareader agreement for synovitis scoring at individual sites

Location	Intrareader 1 w-κ (95% CI)	Intrareader 2 w-κ (95% CI)	Inter-reader w-κ (95% CI)
Medial parapatellar recess	1.00 (1.00 to 1.00)	0.70 (0.48 to 0.92)	0.80 (0.62 to 0.98)
Lateral parapatellar recess	0.80 (0.60 to 0.99)	0.93 (0.81 to 1.00)	0.81 (0.63 to 0.99)
Suprapatellar	0.92 (0.81 to 1.00)	0.63 (0.41 to 0.86)	0.83 (0.69 to 0.97)
Infrapatellar	0.83 (0.69 to 0.97)	0.81 (0.60 to 1.00)	0.78 (0.62 to 0.93)
Intercondylar	0.80 (0.64 to 0.96)	1.00 (1.00 to 1.00)	0.67 (0.50 to 0.85)
Adjacent to PCL	0.83 (0.69 to 0.97)	0.60 (0.34 to 0.86)	0.70 (0.55 to 0.86)
Adjacent to ACL	0.76 (0.53 to 0.96)	0.95 (0.86 to 1.00)	0.69 (0.51 to 0.88)
Medial perimeniscal	0.94 (0.84 to 1.00)	0.74 (0.57 to 0.91)	0.91 (0.79 to 1.00)
Lateral perimeniscal	0.78 (0.61 to 0.94)	0.75 (0.53 to 0.96)	0.67 (0.49 to 0.85)
Adjacent to loose bodies	0.67 (0.10 to 1.00)	0.00 (0.00 to 0.00)*	0.73 (0.31 to 1.00)
Within Baker’s cyst	0.85 (0.56 to 1.00)	0.74 (0.26 to 1.00)	0.92 (0.77 to 1.00)

^*Only a few knees scored by reader 2.

ACL, anterior cruciate ligament; PCL, posterior cruciate ligament; w-κ, weighted κ.