Table 3.
Association between the severity of degenerative changes in various compartments of the knee and the length of follow-up (total no. of knees = 58)
| Radiographic Changes | No. of Knees | |||
|---|---|---|---|---|
| 0–5 Yearsa | 6–10 Yearsa | 11–15 Yearsa | 16–20 Yearsa | |
| Medial compartment | ||||
| Grade 0 | 16 | 26 | 6 | 0 |
| Grade I | 1 | 4 | 1 | 1 |
| Grade II | 1 | 0 | 1 | 1 |
| Grade III | 0 | 0 | 0 | 0 |
| P–F joint | ||||
| Grade 0 | 17 | 28 | 7 | 2 |
| Grade I | 1 | 2 | 1 | 0 |
| Grade II | 0 | 0 | 0 | 0 |
| Grade III | 0 | 0 | 0 | 0 |
| Lateral compartment | ||||
| Grade 0 | 17 | 29 | 7 | 2 |
| Grade I | 1 | 1 | 1 | 0 |
| Grade II | 0 | 0 | 0 | 0 |
| Grade III | 0 | 0 | 0 | 0 |
Grade 0 = normal, grade I = mild degenerative changes (less than 2 mm of narrowing of the apparent joint space and the presence of small intercondylar or pericondylar osteophytes), grade II = moderate degenerative changes (2 to 3 mm of narrowing of the apparent joint space, periarticular sclerosis, and the presence of intercondylar or pericondylar osteophytes), grade III = severe degenerative changes (more than 3 mm of narrowing of the apparent joint space, and presence of extensive osteophytes)
aLength of follow-up