Substantially higher prevalence of postoperative periprosthetic fractures in octo-genarians with hip fractures operated with a cemented, polished tapered stem rather than an anatomic stem: A prospective cohort study involving 979 hips(Acta O

We read with interest the paper by Mukka et al. (2016) concerning periprosthetic femoral fractures around a CPT versus SPII stem. On page 257 the authors write “the SHAR does not capture patients treated with open reduction and internal fi xation with- out exchange of the implant” referring to the annual report of SHAR (Swedish Hip Arthroplasty Register), 2014. At page 10–11 (English version) of this annual report we describe how many periprosthetic femoral fractures (PPFF) had not been registered to SHAR and analyze some characteristics of this patient category.