As of today, active knee bolsters called knee airbags are available in some vehicles. However no assessment of the risk in Out-of-Position (OOP) conducted on Post Mortem Human Subject could be found in the literature. In total, 3 tests were performed in OOP on the Hybrid III 50th percentile dummy and 2 on two 50th percentile PMHS using a rigid subsystem based on the geometry of a commercially available mid-size European vehicle equipped with a knee airbag. The distance between the tibia and the airbag module ranged between 55 and 67 mm on the Hybrid III and was equal to 53 and 54 mm on the PMHS. The tests conducted on Hybrid III resulted in tibial drawer measurements in good agreement with the injury assessments since no injury was observed except bruises and abrasions (AIS 1). The results from the tests were compared to 36 real world frontal accident cases reported in France where drivers sustained only AIS 1 injuries (abrasion, contusion and bruise) during knee airbag deployment. The conclusions of this study are limited by the size of the sample (only 2 PMHS). However, the consistency between the outcome of the dummy and PMHS tests and the information from real world accidents provides a good confidence in the very low risk of injury associated with the knee airbag tested in OOP. Furthermore, the use of the Hybrid III dummy and the knee injury criteria based on the tibial drawer was appropriate in the tests conducted.