Primary stability of a cementless modular revision hip stem in relation with the femoral defect size: A biomechanical study

Abstract

Purpose: Cementless modular fluted hip stems are commonly used in revision arthroplasty. Nevertheless, there is a wide spectrum of recommendations concerning the minimum bone stock required to enable osseous ingrowth and implant–bone micromotions 100 µm), rotational instability emerged as a mechanism of fixation failure when the implant–bone contact zone was only 5 cm or less. Hence, future studies investigating the implant fixation in the case of femoral bone defects should consider both axial and torsional loading. With regard to the clinical application, our data suggest maintaining 7 cm of diaphyseal implant–bone contact for a safe anchorage of cementless fluted hip revision stems.