Strength criteria used for return to running
| Strength criteria (n (%)) | 30 (15%) |
| Isometric test criteria (studies, n) | 13 (6%) |
| LSI>60%39 40 | 2 (1%) |
| LSI>65%30 | 1 |
| LSI>70%26 28 54 (‘isometric leg press testing’)70 | 4 (3%) |
| LSI>85%43 | 1 (0.5%) |
| Quadriceps LSI>60%40 | 1 (0.5%) |
| Quadriceps LSI>70%42 | 1 (0.5%) |
| Quadriceps LSI>75%33 | 1 (0.5%) |
| Quadriceps LSI>80%6 47 50 | 3 (2%) |
| Isotonic test criteria (studies, n) | 2 (1%) |
| LSI>50% (with ‘Push strength on the leg press’, n=1)39 | 1 |
| LSI>80% (‘1-repetition maximum on the leg press (90-0°)’, n=1)34 | 1 |
| Isokinetic test criteria (studies, n) | 13 (6%) |
| Hamstrings:quadriceps ratio between 60% and 70%71 | 1 |
| Quadriceps LSI>80%, hamstrings LSI>110%, quadriceps torque/BW ratio >55%, hamstrings:quadriceps ratio >70%46 | 1 |
| Quadriceps and hamstrings LSI>65%30 45 72 | 3 (2%) |
| Quadriceps and hamstring LSI>70%25 55 56 70 | 4 (2%) |
| Quadriceps and hamstring LSI>75%24 | 1 |
| Quadriceps torque/BW ratio at 300°/s: (>40% (men) and >30% (women)) and quadriceps torque/BW ratio at 180°/s: (>60% (men) and >50% (women))5 | 1 |
| ‘…satisfactory isokinetic test…’59 62 | 2 (1%) |
| Other subjective or unclear criteria (studies, n) | 6 (3%) |
| ‘Good manual strength test’38 49 | |
| ‘…Lift 15 lbs during short arc quadriceps exercise… ’71 | 1 |
| ‘Good muscle strength and control’ (…when muscle strength and control allow…)73 | 1 |
| ‘…Sufficient musculature…’74 | 1 |
| ‘…Good quadriceps contraction in extension…’41 | 1 |
BW, body weight; LSI, limb symmetry index.