Table 2.
Pearson Product Moment Correlations
| Variable |
Score at Return to Activity (P Value) |
||
| International Knee Documentation Committee |
Anterior Cruciate Ligament Return to Sport After Injury |
Psychological Response to Sport Injury Inventory |
|
| Table 2.1: Presurgery Pain and Quadriceps Function | |||
| Maximal voluntary isometric contractions | |||
| Injured limb | 0.36 (.16)a | 0.32 (.15) | −0.09 (.68) |
| Uninjured limb | 0.33 (.15) | 0.37 (.10) | −0.08 (.72) |
| Quadriceps index | 0.07 (.75) | 0.08 (.72) | −0.11 (.63) |
| Central activation ratio | |||
| Injured limb | 0.26 (.34) | 0.24 (.29) | −0.35 (.12) |
| Uninjured limb | 0.04 (.84) | 0.35 (.13) | −0.16 (.50) |
| Quadriceps index | 0.25 (.28) | 0.06 (.78) | −0.22 (.35) |
| Knee Injury and Osteoarthritis Outcome Score, pain | 0.25 (.28) | 0.56 (.01)b | −0.54 (.01)b |
| Table 2.2: Return-to-Activity Pain and Quadriceps Function | |||
| Maximal voluntary isometric contractions | |||
| Injured limb | 0.72 (<.001)b | 0.60 (.005)b | −0.59 (.01)b |
| Uninjured limb | 0.51 (.02)b | 0.51 (.02)b | −0.50 (.02)b |
| Quadriceps index | 0.14 (.54) | 0.08 (.73) | −0.02 (.92) |
| Central activation ratio | |||
| Injured limb | 0.11 (.64) | 0.02 (.92) | −0.09 (.67) |
| Uninjured limb | 0.09 (.70) | 0.02 (.92) | −0.05 (.83) |
| Quadriceps index | 0.02 (.93) | 0.01 (.97) | −0.12 (.60) |
| Knee Injury and Osteoarthritis Outcome Score, pain | 0.79 (<.001)b | 0.52 (.01)b | −0.51 (.02)b |
a
Correlation coefficients (r) classified as weak (0–0.4), moderate (0.4–0.7), or strong (0.7–1.0).
b
Significant at P ≤ .05.