REPLY TO LETTER TO THE EDITOR Reply to Letter to Editor Femoral Component Positioning in Hip Resurfacing with and Without Navigation

comments and opinions on hip resurfacing surgical tech-nique and factors that may affect clinical outcome. Even if no specific question or comment is directly related to our study [2], we will try to provide a scientific input on the points raised. The first ‘‘procedural trap’ ’ reported by Dr. Salvi is in relation to the femoral component stem (providing initial stability and alignment). In the resurfacing system used in our study (Durom1; Zimmer, Inc, Warsaw, IN), the fem-oral stem is smooth and slightly smaller than the drilled hole. The purpose of the stem is purely to allow centering the femoral component over the prepared femur to allow uniform cement mantle (0.75–1.0 mm in this system). The stem is intentionally undersized to avoid load transfer to the bone and prevent femoral head osteopenia by stres