Reply to the Letter to the editor from Grappiolo G et al. to the article 'The History of the development of the regular straight stem in hip arthroplasty'.

Thank you very much for having made the effort to critique (1) our publication. It is a great pleasure and an honour to see our work being read so attentively. As mentioned in the Introduction section, our publication is a narrative review (2) focussing on the major developments of the stem in total hip arthroplasty and discussing the most common designs. The chosen format would never have allowed for providing a systematic review of all data available for each stem and each of its modifications. We fully acknowledge this, as well as the limitations of the method, and thank our colleagues for the additional information they have provided.