TABLE 2.
Magnetic Resonance Imaging T1ρ Mapping of Knee Jointsa
| Cartilage ROI T1ρ Values, msb | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Medial Femoral Condyle | Medial Tibial | Lateral Femoral Condyle | Lateral Tibial | |||||||
| MFC1 | MFC2 | MFC3 | MT1 | MT2 | LFC1 | LFC2 | LFC3 | LT1 | LT2 | |
| ACL status | ||||||||||
| Control | 43.9 ± 3.3 | 44.8 ± 2.2 | 48.1 ± 2.8 | 43.4 ± 2.8 | 43.8 ± 2.2 | 42.1 ± 3.0 | 46.1 ± 2.4 | 46.9 ± 3.9 | 38.4 ± 3.2 | 41.6 ± 3.6 |
| Acute (<12 wk) | ||||||||||
| Group A | 45.3 ± 3.6 | 47.8 ± 3.3 | 49.7 ± 2.6 | 43.0 ± 2.7 | 44.3 ± 3.3 | 44.2 ± 3.1 | 49.0 ± 4.9 | 49.8 ± 3.8 | 38.7 ± 2.5 | 43.1 ± 2.8 |
| Chronic (≥12 wk) | ||||||||||
| Group B (≤2 y) | 45.2 ± 3.3 | 46.7 ± 2.6 | 47.5 ± 3.3 | 44.1 ± 5.2 | 43.4 ± 2.5 | 44.0 ± 3.2 | 47.0 ± 2.8 | 47.9 ± 5.0 | 38.2 ± 3.1 | 41.8 ± 3.0 |
| Group C (>2 y) | 50.6 ± 8.0d | 52.4 ± 7.4e | 49.8 ± 3.3 | 42.3 ± 2.0 | 44.2 ± 2.1 | 46.4 ± 6.6 | 49.1 ± 6.1 | 48.6 ± 4.5 | 37.0 ± 0.8 | 39.9 ± 2.1 |
| Meniscusc | ||||||||||
| Acute (<12 wk) | ||||||||||
| MM(+) | 44.9 ± 4.1 | 48.9 ± 3.4 | 49.6 ± 2.0 | 42.5 ± 1.7 | 44.7 ± 2.4 | — | — | — | — | — |
| MM(–) | 45.5 ± 3.4 | 47.2 ± 3.2 | 49.7 ± 2.9 | 43.3 ± 3.1 | 44.1 ± 3.7 | — | — | — | — | — |
| LM(+) | — | — | — | — | — | 44.3 ± 3.3 | 50.2 ± 6.4 | 49.4 ± 4.2 | 38.5 ± 2.8 | 44.0 ± 2.6 |
| LM(–) | — | — | — | — | — | 44.1 ± 3.0 | 48.1 ± 5.0 | 50.0 ± 3.7 | 38.9 ± 2.4 | 42.5 ± 2.9 |
| Chronic (≥12 wk) | ||||||||||
| MM(+) | 49.2 ± 7.4f | 51.5 ± 6.5g | 49.3 ± 3.2 | 42.6 ± 2.9 | 43.9 ± 2.4 | — | — | — | — | — |
| MM(–) | 45.0 ± 2.8 | 46.0 ± 1.7 | 47.4 ± 3.4 | 44.2 ± 5.6 | 43.5 ± 2.3 | — | — | — | — | — |
| LM(+) | — | — | — | — | — | 44.1 ± 4.1 | 46.9 ± 1.5 | 49.6 ± 5.8 | 37.4 ± 3.6 | 41.3 ± 2.9 |
| LM(–) | — | — | — | — | — | 45.0 ± 4.9 | 48.0 ± 4.8 | 47.6 ± 4.3 | 38.0 ± 2.2 | 41.1 ± 3.0 |
aData are reported as mean ± SD. Dashes indicate no data were available. LM, lateral meniscus; MM, medial meniscus; MRI, magnetic resonance imaging; ROI, region of interest.
bSee Figure 1 for definitions of ROIs.
c(+), with meniscal tears; (–), without meniscal tears.
dSignificant difference: P < .01 versus control, P = .02 versus group A, P = .03 versus group B.
eSignificant difference: P < .001 versus control, P = .02 versus group A, P < .01 versus group B.
fSignificant difference: P = .03 versus control.
gSignificant difference: P < .001 versus control, P = .03 versus acute MM(–), P < .01 versus chronic MM(–).