Vigdorchik JM, Sharma AK, Madurawe CS, et al. - This study was attempted to test, applying a virtual simulation, if bony or prosthetic impingement presents first in well-positioned total hip arthroplasty (THA). Researchers included a total of 23 patients requiring THA for a ceramic-on-poly cementless construct applying dynamic planning software. When standing, cups were orientated at 45° inclination and 25° anteversion. They recorded type and location of impingement with recreation of anterior and posterior impingement during standard and extreme ranges of motion (ROM). This study's findings demonstrate that in standard ROM, both bony and prosthetic impingement occurred in flexion, while prosthetic impingement occurred in extension in models with lipped liners. In hyperextension, compared with bony impingement, prosthetic impingement was more common, and was exclusively the cause of impingement when a lip was applied. It was noted that impingement was primarily bony with the use of a 36-mm head in flexion. The data reveal that the risk of posterior prosthetic impingement was greatest with dual mobility cups.