Table 4. Mean (±standard deviation) thigh muscle and adipose tissue CSAs, isometric muscle strength, and specific strength and percent differences (mean with 95% confidence interval) between painless and chronically painful knees at the year 2 follow-up.
| Chronically Painful | Painless | % Difference (95% CI) | Between group p* | |
|---|---|---|---|---|
| Quadriceps (cm2) | 50.4 ± 12.8 | 52.1 ± 11.7 | -2.4 (- 8.2, 3.4) | 0.24 |
| Quadriceps %TTC | 27.0 ± 6.5 | 28.7 ± 6.5 | -3.9 (-10.3, 2.4) | 0.04 |
| V. medialis (cm2) | 18.7 ± 4.9 | 20.2 ± 5.3 | -5.2 (-12.0, 1.7) | 0.04 |
| V. lateralis (cm2) | 12.2 ± 4.1 | 12.9 ± 3.6 | -0.4 (-11.5, 10.6) | 0.32 |
| V. intermedius (cm2) | 14.4 ± 3.8 | 14.3 ± 3.4 | +1.8 (-5.0, 8.5) | 0.84 |
| Rectus fem. (cm2) | 2.4 ± 1.2 | 2.1 ± 0.8 | +40 (69.5, 11.0) | 0.09 |
| Extensors (N) | 338 ± 121 | 364 ± 133 | -1.5 (-12.8, 9.7) | 0.22 |
| Extensors/Quadriceps (N/cm2) | 6.8 ± 2.1 | 7.0 ± 1.8 | +3.2 (-9.1, 15.6) | 0.66 |
| Hamstrings (cm2) | 35.3 ± 8.6 | 33.6 ± 7.7 | +6.5 (0.3, 12.7) | 0.09 |
| Flexors (N) | 124 ± 57.1 | 140 ± 59.8 | +10 (-22.9, 43.3) | 0.21 |
| Flexors/Hamstrings (N/cm2) | 3.6 ± 1.5 | 4.2 ± 1.4 | +4.8 (25.7, 35.2) | 0.07 |
| Adductors (cm2) | 12.3 ± 5.3 | 11.0 ± 5.2 | +31 (5.9, 56.4) | 0.14 |
|
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| SCF (cm2) | 65.5 ± 29.4 | 64.3 ± 36.1 | +20 (0.2, 39.7) | 0.80 |
| SCF %TTC | 34.4 ± 13.2 | 33.3 ± 14.0 | +12 (-1.2, 24.4) | 0.51 |
| IMF (cm2) | 11.0 ± 3.5 | 10.6 ± 2.7 | +6.5 (-4.1, 17.1) | 0.44 |
| IMF%TTC | 5.9 ± 1.7 | 5.8 ± 1.2 | +5.4 (-6.1, 16.9) | 0.72 |
| IMT (cm2) | 14.1 ± 3.7 | 14.1 ± 3.0 | +2.0 (-5.5, 9.5) | 0.90 |
| Total thigh (cm2) | 188 ± 30.1 | 185 ± 35.8 | +3.7 (-2.2, 9.6) | 0.60 |
95% CI=95% confidence interval; Quadriceps%TTC=percentage of quadriceps of total thigh cross-sectional area (CSA); Extensors=Extensor strength; N=Newton; Flexors=Flexor strength; SCF=subcutaneous fat; SCF%TTC=percentage of SCF of the total thigh CSA; IMF=intermuscular fat; IMF%TTC=percentage of IMF of the total thigh CSA; IMT=intermuscular tissue;
*
paired t-test: chronically painful vs. painless at year 2 follow-up