Table 3.
Results of studies investigating the effectiveness of anterior cruciate ligament injury prevention programs on knee flexion angle.
| Study | Taska | Outcome | Change (%)b,c | Effect Sizec |
|---|---|---|---|---|
| Chappell, Limpisvasti5 | DJ | Increased knee flexion at initial contactd | 17.4 | 0.58 |
| Increased peak knee flexiond | 6.9 | 0.53 | ||
| SJ | No significant change in knee flexion at initial contact | 4.4 | 0.17 | |
| No significant change in peak knee flexion | −2.7 | 0.19 | ||
| Lephart et al17 | VJ | No significant change in knee flexion at initial contact for plyometric group | −16.1 | 0.36 |
| No significant change in knee flexion at initial contact for basic resistance group | 4.8 | 0.07 | ||
| Increased knee flexion at initial contact for plyometric groupd | 38.8 | 0.68 | ||
| Increased knee flexion at initial contact for basic resistance groupd | 12.5 | 0.4 | ||
| Pollard et al31 | DJ | No significant change in peak knee flexion | −5.2 | 0.26 |
| Herman et al12 | SJ | No significant change in peak knee flexion | −9.9 | 0.46 |
| Hewett et al14 | VJ | No significant change in peak knee flexion | −1.2 | 0.17 |
| Myer et al25 | DJ | Increased knee flexion at initial contact for plyometric groupd | NA | NA |
| No significant change in knee flexion at initial contact for balance group | NA | NA | ||
| Increased peak knee flexion for plyometric groupd | NA | NA | ||
| No significant change in peak knee flexion for balance group | NA | NA | ||
| 1-LMDL | No significant changes in knee flexion at initial contact for plyometric group | NA | NA | |
| No significant change in knee flexion at initial contact for balance group | NA | NA | ||
| No significant change in peak knee flexion for plyometric group | NA | NA | ||
| Increased peak knee flexion for balance groupd | NA | NA | ||
| Myer et al26 | DJ | Increased knee flexion range of motiond | 8.4 | NA |
a
DJ, drop jump; SJ, stop-jump; VJ, vertical jump; 1-LMDL, 1-leg medial drop land.
b
Positive percentage change indicates increased knee flexion angle; negative percentage change indicates decreased knee flexion angle.
c
NA, not available (ie, means and measures of variability were not provided in the study).
d
Indicates significant change following completion of injury prevention program.