| Grade 0 | Joint surface is smooth, or has a 1mm depression |
| Grade I | Joint surface has a 1-2mm depression |
| Grade II | Joint surface has a 2-3mm depression |
| Grade III | Joint surface has a 3mm depression |
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| Grade 0 | Joint surface is smooth, or has a 1mm depression |
| Grade I | Joint surface has a 1-2mm depression |
| Grade II | Joint surface has a 2-3mm depression |
| Grade III | Joint surface has a 3mm depression |