| Criteria | Walking | Pain | Mobility | Stability |
| Very good | Normal | No pain | Full extension, flexion of 120˚ or more | Perfect, no laxity |
| Good | Normal or slight claudication | Rare and moderate pain | Flexion of more than 90˚, full extension or flessum of less than 10˚. | No laxity in extension, unilateral squatting possible but with minimal difficulty |
| Average | Limited or with a cane | At the effort | Flexion from 60˚ to 90˚, Flessum below 20 | Laxity in extension, unilateral squatting impossible |
| Bad | No walking or with 2 canes | Permanent | Flexion less than 60˚, flessum greater than 20 | Severe instability, monopodal support impossible |