Table 1 Participant characteristics by strength quartile
| Â | Quartile 1 (weakest) | Quartile 2 | Quartile 3 | Quartile 4 (strongest) | P value |
|---|---|---|---|---|---|
| Â | Quadriceps Strength | ||||
Age | 56 (6) | 56 (7) | 61 (7) | 60 (8) | 0.889 |
Sex | Â | Â | Â | Â | 0.021 |
 Male | 20% | 40% | 45% | 64% |  |
 Female | 80% | 60% | 55% | 36% |  |
BMI | 33 (7) | 31 (6) | 28 (4) | 27 (4) | 0.061 |
MOAKS Cartilage Damage Depth Score | Â | Â | Â | Â | 0.169 |
 0 | 27% | 41% | 20% | 36% |  |
 1 | 22% | 22% | 24% | 25% |  |
 2 | 44% | 29% | 41% | 34% |  |
 3 | 7% | 8% | 15% | 5% |  |
MOAKS Cartilage Damage Size Score | Â | Â | Â | Â | 0.011 |
 0 | 2% | 2% | 0% | 6% |  |
 1 | 0% | 6% | 5% | 9% |  |
 2 | 59% | 63% | 41% | 52% |  |
 3 | 39% | 29% | 54% | 33% |  |
K-L Grade | Â | Â | Â | Â | 0.002 |
 0 | 12% | 13% | 9% | 5% |  |
 1 | 12% | 27% | 12% | 33% |  |
 2 | 39% | 49% | 39% | 39% |  |
 3 | 37% | 11% | 39% | 23% |  |
Quadriceps Strength (N/kg) | 0.86 (0.28) | 1.47 (0.13) | 2.02 (0.20) | 3.11 (0.57) | < 0.001 |
KOOS Pain | 44 (16) | 53 (14) | 55 (13) | 62 (15) | < 0.001 |
KOOS Symptoms | 43 (15) | 47 (15) | 43 (15) | 47 (13) | 0.226 |
KOOS ADL | 53 (19) | 60 (17) | 67 (14) | 72 (16) | < 0.001 |
TUG Test (s) | 12 (5) | 10 (4) | 9 (3) | 9 (2) | 0.008 |
| Â | Hamstrings Strength | ||||
Age | 57 (7) | 58 (7) | 59 (8) | 60 (7) | 0.627 |
Sex | Â | Â | Â | Â | 0.007 |
 Male | 26% | 33% | 51% | 63% |  |
 Female | 74% | 67% | 49% | 37% |  |
BMI | 32 (7) | 31 (6) | 28 (5) | 27 (4) | 0.081 |
MOAKS Cartilage Damage Depth Score | Â | Â | Â | Â | 0.840 |
 0 | 35% | 30% | 30% | 28% |  |
 1 | 21% | 16% | 29% | 28% |  |
 2 | 36% | 43% | 33% | 35% |  |
 3 | 8% | 11% | 8% | 8% |  |
MOAKS Cartilage Damage Size Score | Â | Â | Â | Â | 0.544 |
 0 | 2% | 2% | 2% | 5% |  |
 1 | 2% | 8% | 6% | 5% |  |
 2 | 62% | 54% | 46% | 52% |  |
 3 | 35% | 36% | 46% | 38% |  |
K-L Grade | Â | Â | Â | Â | 0.358 |
 0 | 11% | 14% | 9% | 3% |  |
 1 | 15% | 16% | 29% | 25% |  |
 2 | 47% | 44% | 33% | 42% |  |
 3 | 27% | 25% | 29% | 30% |  |
Hamstrings Strength (N/kg) | 0.64 (0.17) | 1.10 (0.12) | 1.57 (0.15) | 2.30(0.41) | < 0.001 |
KOOS Pain | 46 (16) | 51 (14) | 55 (14) | 63 (14) | < 0.001 |
KOOS Symptoms | 44 (15) | 45 (16) | 44 (15) | 47 (14) | 0.925 |
KOOS ADL | 55 (18) | 60 (18) | 66 (16) | 74 (14) | < 0.001 |
TUG Test (s) | 12 (5) | 10 (3) | 9 (3) | 9 (2) | 0.005 |