Large diameter heads: Is bigger always better?

Larger femoral heads are increasingly being used in total hip arthroplasty (THA). They offer the clinical advantage of increased range of movement and stability. A reduction in dislocation rate is reported with these implants. This article reviews the laboratory and clinical evidence in support of the use of larger femoral heads and also the potential complications of wear and corrosion. The conclusion is that there is a place for larger femoral heads; however, their use does not provide an escape for poor surgical technique, and adverse effects of wear and corrosion must be considered when selecting implants.