Table 1.

Intra- and inter-observer · reliability

		Weighted kappa	Standard error	95 % confidence interval		Weighted kappa	Standard error	95 % confidence interval
				Lower	Upper			Lower	Upper
		Intra-observer reliability				Inter-observer reliability
Cartilage area involvement (0–3)	Whole knee	0.87	0.054	0.76	0.97	0.89	0.053	0.78	0.99
	Medial TFJ	0.84	0.092	0.66	1.00	0.87	0.090	0.69	1.00
	Lateral TFJ	0.89	0.092	0.71	1.00	0.96	0.093	0.78	1.00
	PFJ	0.86	0.094	0.68	1.00	0.82	0.094	0.64	1.00
Cartilage % of subregion affected by full thickness damage (0–3)	Whole knee	0.78	0.056	0.67	0.89	0.86	0.055	0.75	0.96
	Medial TFJ	0.73	0.091	0.56	0.91	0.84	0.095	0.65	1.00
	Lateral TFJ	0.73	0.096	0.54	0.92	0.79	0.093	0.61	0.97
	PFJ	0.85	0.101	0.65	1.00	0.92	0.100	0.73	1.00
BML size (0–3)	Whole knee	0.87	0.050	0.77	0.97	0.90	0.050	0.80	1.00
	Medial TFJ	0.84	0.081	0.68	1.00	0.90	0.082	0.74	1.00
	Lateral TFJ	0.90	0.087	0.73	1.00	0.90	0.086	0.73	1.00
	PFJ	0.87	0.093	0.69	1.00	0.89	0.092	0.71	1.00
Meniscus Morphology (0–8)	Whole knee	0.97	0.085	0.81	1.00	0.99	0.085	0.82	1.00
	Medial TFJ	0.97	0.112	0.74	1.00	1.00	0.120	0.76	1.00
	Lateral TFJ	0.97	0.121	0.73	1.00	0.97	0.121	0.73	1.00
Meniscus Extrusiona(0–3)	Medial	0.83	0.226	0.38	1.00	0.58	0.208	0.17	0.99
	Lateral	0.88	0.228	0.44	1.00	0.76	0.222	0.32	1.00
Hoffa-Synovitis (0–3)		0.68	0.157	0.38	0.99	0.68	0.157	0.38	0.99
Effusion-Synovitis (0–3)		0.95	0.174	0.61	1.00	0.91	0.171	0.57	1.00

^aSimple kappa for meniscal extrusion: dichotomized into 0 and 1–3 (>2 mm)