Table 9.
The Extrusion width (EW), Inner width (IW), and Total width (EW + IW) of the medial and lateral menisci were compared between the PAONK group and the matched control group at the 2 periods, before meniscectomy and at the time of diagnosis of PAONK, respectively. The comparisons were made using Mann-Whitney U test. Concerning the time of the MRI examination, “After meniscectomya” means “At the time of diagnosis of PAONK” in the PAONK group and “At the time of the second-look MRI taken 6 – 12 months after the meniscectomy” in the Control group
| Meniscus | Measures | Time of the MRI examination | PAONK Group | Control Group | Comparison |
|---|---|---|---|---|---|
| Medial | Extrusion width (EW) | Before meniscectomy | 4.7 (1.4) | 3.0 (1.3) | P = 0.0195 |
| After meniscectomya | 5.9 (1.1) | 3.4 (1.4) | P = 0.0009 | ||
| Inner width (IW) | Before meniscectomy | 4.4 (2.4) | 6.3 (1.7) | N.S. | |
| After meniscectomya | 0.6 (1.7) | 3.9 (1.0) | P = 0.0001 | ||
| Total width (EW + IW) | Before meniscectomy | 9.1 (1.5) | 9.3 (1.5) | N.S. | |
| After meniscectomya | 6.4 (1.2) | 7.2 (1.3) | N.S. | ||
| Lateral | Extrusion width (EW) | Before meniscectomy | −0.2 (0.8) | 0.1 (1.2) | N.S. |
| After meniscectomya | −0.2 (0.9) | 0.2 (1.3) | N.S. | ||
| Inner width (IW) | Before meniscectomy | 9.1 (1.7) | 10.8 (3.0) | N.S. | |
| After meniscectomya | 8.9 (1.8) | 10.4 (3.3) | N.S. | ||
| Total width (EW + IW) | Before meniscectomy | 8.9 (1.3) | 10.9 (2.6) | N.S. | |
| After meniscectomya | 8.7 (1.6) | 10.6 (2.9) | N.S. |
Mean (standard deviation)