CC BY-NC-ND 4.0 · Rev Bras Ortop (Sao Paulo) 2020; 55(03): 353-359
DOI: 10.1055/s-0039-1693052
Artigo Original
Quadril
Sociedade Brasileira de Ortopedia e Traumatologia. Published by Thieme Revinter Publicações Ltda Rio de Janeiro, Brazil

Is it Important to Know Where to Place the Spherical Marker for Hip Replacement Digital Planning?[*]

Article in several languages: português | English
1  Grupo de Quadril, Departamento de Ortopedia e Traumatologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), Irmandade Santa Casa de Misericórdia, São Paulo, SP, Brasil
,
Thiago Tronco Salerno
1  Grupo de Quadril, Departamento de Ortopedia e Traumatologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), Irmandade Santa Casa de Misericórdia, São Paulo, SP, Brasil
,
João Hélio Zucarelli Rezende
1  Grupo de Quadril, Departamento de Ortopedia e Traumatologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), Irmandade Santa Casa de Misericórdia, São Paulo, SP, Brasil
,
Walter Ricioli Junior
1  Grupo de Quadril, Departamento de Ortopedia e Traumatologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), Irmandade Santa Casa de Misericórdia, São Paulo, SP, Brasil
,
Nayra Deise Rabelo
1  Grupo de Quadril, Departamento de Ortopedia e Traumatologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), Irmandade Santa Casa de Misericórdia, São Paulo, SP, Brasil
2  Laboratório de Análise do Movimento Humano, Departamento de Ciências da Reabilitação, Universidade Nove de Julho - UNINOVE, São Paulo, SP, Brasil
,
Marcelo Cavalheiro de Queiroz
1  Grupo de Quadril, Departamento de Ortopedia e Traumatologia, Faculdade de Ciências Médicas da Santa Casa de São Paulo (FCMSCSP), Irmandade Santa Casa de Misericórdia, São Paulo, SP, Brasil
› Author Affiliations
Further Information

Publication History

07 March 2018

22 January 2019

Publication Date:
07 November 2019 (online)

Abstract

Objective The present paper aims to evaluate the influences of individual characteristics in radiographic magnification and to identify the most accurate method for radiographic calibration.

Methods During radiographical exam of 50 patients with hip prosthesis, anthropometric data was collected and 4 spherical metal markers with 25 mm diameters were positioned: at the greater trochanter level and lateral to it, over the pubic symphysis, between the thighs at the greater trochanter level, and over the exam table. Since the prosthesis head is the best internal radiographic marker for hip arthroplasty, it was our calibration parameter. Two examiners measured the markers' image for further analysis.

Results The sample consisted of 50 participants, 19 of whom were male. A difference in pubic symphysis magnification was found. Other individual characteristics (weight, height and body mass index) had weak correlation. The higher accuracy of the markers was at the greater trochanter, between 68.4 and 78.9%, visualized in only19 radiographs. The marker positioned between the thighs was visualized in all radiographs, with an accuracy ranging from 30 to 46%.

Conclusions Of all individual characteristics, only gender influences magnification at the pubic symphysis. We suggest the use of two spherical markers: at the greater trochanter, due the best accuracy, and between the thighs, considered the best positioning for better visibility.

* Work performed at the Grupo de Quadril do Departamento de Ortopedia e Traumatologia da Faculdade de Ciências Médicas Santa Casa de Misericórdia de São Paulo (FCMSCSP), São Paulo, SP, Brasil