Execution:
- Patient is in supine lying position with the hip flexed to 45° and knee flexed to 90°
- The examiner uses one hand to apply internal tibial rotation and places the other hand over the proximal tibial plateau and fibula
- Then the examiner applies a valgus force to the knee and slowly extends the knee
Positive Outcome: A sudden acceleration or jerk during the movement, usually at around 30° of flexion characterised by the anterior subluxation of the lateral tibial plateau. The tibia will suddenly reduce again when the knee reaches full extension
| Study | Reliability | Sn | Sp | LR+ | LR- |
| Hughston et al. (1976) | NA | NA | NA | NA | NA |
| Jensen (1990) | NA | NA | NA | NA | NA |
