Vigdorchik JM, Sharma AK, Madurawe C, et al. - Researchers aimed at examining whether bony or prosthetic impingement presents first in well-positioned total hip arthroplasties (THAs) via utilizing a virtual simulation. They planned 23 patients requiring THA for a ceramic-on-poly cementless construct using dynamic planning software. When standing, cups were orientated at 45° inclination and 25° anteversion. To reproduce native anteversion and match contralateral leg length and offset, positioning of femoral components and neck lengths was done. Then, recording of the type and location of impingement was done with recreation of anterior and posterior impingement during standard and extreme ranges of motion (ROM). Per findings, in standard ROM, occurrence of both bony and prosthetic impingement was observed in flexion, while occurrence of prosthetic impingement was noted in extension in models with lipped liners. In hyperextension, they more frequently observed occurrence of prosthetic impingement vs bony impingement; this was noted to be the exclusive cause of impingement when a lip was used. In flexion, primarily bony impingement was noted with the use of a 36-mm head. They observed greatest risk of posterior prosthetic impingement with dual mobility cups.