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Total Hip Arthroplasty Digital Templating: Size Predicting Ability and Interobserver Variability

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Abstract

Background

During the last century, total hip arthroplasties have become more popular. They have had a huge impact on the quality of life, pain, range of motion, social interaction, and psychological well-being. A number of studies have emphasized the importance of using templates to choose the appropriate implant size when planning the surgery. Our aim is to use MediCad® software to analyze the ability of the digital template system MediCad® to predict the size of the implant needed in total hip arthroplasties.

Materials and Methods

An arthroplasty preoperative plan was created according to the MediCad® software guidelines, on anteroposterior hip X-ray by one junior resident, one senior resident, and three experienced hip surgeons.

Results

The median size accuracy was 0.7 (range: 0.27–0.87) for the cup, 0.73 (range: 0.36–0.83) for the stem, and 0.28 (range: −0.14–0.69) for the neck. Interobserver reliability was good (kappa > 0.4) and stronger when measuring the stem than when doing so with the cup. Conclusion: Digital preoperative total hip arthroplasty planning is a good method for predicting component size, restoring hip anatomy (vertical offset and horizontal offset), with good interobserver reliability.

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Authors and Affiliations

  1. Department of Orthopedic Surgery and Traumatology, Clínica Universidad de Navarra, Av. Pio XII, 36, 31008, Pamplona, Navarra, Spain

    Veronica Montiel, Santiago Troncoso, Andrés Valentí-Azcárate, Juan Ramón Valentí-Nin & Jose María Lamo-Espinosa

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  1. Veronica Montiel
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  2. Santiago Troncoso
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Correspondence to Veronica Montiel.

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Montiel, V., Troncoso, S., Valentí-Azcárate, A. et al. Total Hip Arthroplasty Digital Templating: Size Predicting Ability and Interobserver Variability. JOIO 54, 840–847 (2020). https://doi.org/10.1007/s43465-020-00217-0

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