Table 2.

Inter- and intraobserver correlation coefficients of the Kellgren and Lawrence classification in various joints [19]

Joint examined	Interobserver correlation coefficient (r)	Intraobserver correlation coefficient (r)
First carpometacarpal joint	0.78	0.81
Wrist	0.10	0.62
Cervical spine	0.57	0.66
Dorsolumbar spine	0.52	0.42
Hips	0.40	0.75
Knees	0.83	0.83
Metacarpophalangeal	Not done	0.88

Modified with permission from Kellgren JH, Lawrence JS. Radiological assessment of osteo-arthrosis. Ann Rheum Dis. 1957;16:494–502.