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The Bone & Joint Journal
Vol. 101-B, Issue 7 | Pages 779 - 786
1 Jul 2019
A calcar collar is protective against early periprosthetic femoral fracture around cementless femoral components in primary total hip arthroplasty
Lamb JN Baetz J Messer-Hannemann P Adekanmbi I van Duren BH Redmond A West RM Morlock MM Pandit HG
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Aims

The aim of this study was to estimate the 90-day risk of revision for periprosthetic femoral fracture associated with design features of cementless femoral stems, and to investigate the effect of a collar on this risk using a biomechanical in vitro model.

Materials and Methods

A total of 337 647 primary total hip arthroplasties (THAs) from the United Kingdom National Joint Registry (NJR) were included in a multivariable survival and regression analysis to identify the adjusted hazard of revision for periprosthetic fracture following primary THA using a cementless stem. The effect of a collar in cementless THA on this risk was evaluated in an in vitro model using paired fresh frozen cadaveric femora.

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