Buller LT, et al. - Given the common prevalence of the off-label practice of mixing femoral heads with dual mobility (DM) polyethylene liners from different manufacturers in order to prevent the morbidity of removing well-fixed implants during revision surgery, researchers investigated the resistance to intraprosthetic dislocation, when the inner prosthetic head disengages from the polyethylene bearing, between mixed and same manufacturer constructs. They examined 97 same and 32 mixed manufacturer DM constructs. Findings revealed that the force needed to lever-out same and mixed manufacturer inner heads from DM liners was not different, this indicates that the risk of intraprosthetic instability should not be increased as a result of mixing manufacturers when placing DM articulations on well-fixed femoral stems.