Dumont GD, et al. - Researchers examined how the portal used for drilling, the position of the drill guide on the acetabular rim, and the use of straight vs curved drill guides influence drill perforation of the acetabular subchondral bone and the outer cortex of the acetabulum. They marked 60 acetabular models at the 3-, 2-, 1-, 12-, and 11-o'clock positions and created simulated anterior, anterolateral, and distal anterolateral accessory (DALA) portals. At each clock-face position, they drilled 12 groups of 5 acetabula using all combinations of variables. Outcomes revealed the lowest rate of acetabular subchondral perforation with using the DALA portal and a drill starting point slightly off the acetabular rim and hence it is recommended to diminish the risk of iatrogenic chondral injury.