Execution:
- Patient is in supine lying position
- The examiner places their hand on the patient’s quads of the contralateral leg, while the tested leg is bent over the examiner’s arm
- The patient is then asked to extend the knee while the examiner gives resistance
Outcome: Decreased strength rated with the MRC scale compared to the other side
| Study | Reliability | Sn | Sp | LR+ | LR- |
| Hancock et al. (2011): L3/L4 Disc Herniation | NA | 67 | 40 | 1.11 | 0.84 |
| Hancock et al. (2011): L4/L5 Disc Herniation | NA | 64 | 42 | 1.11 | 0.85 |
| Hancock et al. (2011): L5/S1 Disc Herniation | NA | 61 | 39 | 1 | 1 |
| Comment: Quadriceps weakness does not seem to be able to identify the level of disc herniation | |||||
