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Table 1 Crawford Radiographic scoring system

From: Homing and reparative effect of intra-articular injection of autologus mesenchymal stem cells in osteoarthritic animal model

Radiographic evaluation
0 = normal
1 = no bone or cartilage change, slight joint distention and effusion.
2 = minimal bone changes, osteophytes < 1 mm, without evidence of cartilage loss
3 = moderate bone changes, osteophytes 1- 2 mm, bone lysis or cartilage loss
4 = severe bone changes, osteophytes > 2 mm, with/without evidence of cartilage loss and/or bone lysis