Table 3.

Interobserver agreement, 2-grade- and 4-grade analysis***

	2D			3D
	All	t1	t2	All	t1	t2
4-grade (Dejour)	0.48	0.44	0.48	0.53	0.58	0.47
2-grade (High/Low)	0.46	0.43	0.40	0.59	0.63	0.57

^***Fleiss-Kappa values of Interrater agreement; 4-grade, Dejour classification; 2-grade, high/low grade trochlear dysplasia; 2D, 2D axial MRI scan; 3D, MRI-based 3D model; t1, time point 1; t2, time point 2