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. 2017 May-Jun;50(3):170-175.
doi: 10.1590/0100-3984.2016.0007.

Anthropometric study of the knee in patients with osteoarthritis: intraoperative measurement versus magnetic resonance imaging

Fabrício Bolpato Loures  1 , Renato Janetti Carrara  2 , Rogério Franco de Araújo Góes  3 , Rodrigo Sattamini Pires E Albuquerque  4 , João Maurício Barretto  5 , André Kinder  6 , Vinicius Schott Gameiro  7 , Edson Marchiori  8
Affiliations

Anthropometric study of the knee in patients with osteoarthritis: intraoperative measurement versus magnetic resonance imaging

Fabrício Bolpato Loures et al. Radiol Bras. 2017 May-Jun.

Abstract
in English, Portuguese

Objective: To compare intraoperative measurements of the knee with those obtained by magnetic resonance imaging, in order to validate the latter method for use in anthropometric studies.

Materials and methods: We studied 20 knees in 20 patients with osteoarthritis, all of whom underwent total arthroplasty between August and December of 2013. We took six measurements in the distal femur and two in the proximal tibia. Using the information system of the institution, we made the measurements on magnetic resonance imaging scans that had been obtained in the axial plane. Intraoperative measurements were obtained using a caliper, after the initial cuts made during the arthroplasty. The anatomical parameters determined by magnetic resonance imaging were the same as those determined by intraoperative measurement. The intraclass correlation coefficient was used in order to assess the level of agreement in anthropometric measurements of the knee performed by magnetic resonance imaging and by intraoperative measurement.

Results: Statistical analysis revealed a highly significant correlation between the knee anthropometric parameters of the knee determined by intraoperative measurement and those determined by magnetic resonance imaging.

Conclusion: The dimensions of osteoarthritic knees measured by magnetic resonance imaging were similar to those measured intraoperatively. Therefore, magnetic resonance imaging can be considered a reliable method for use in large-scale anthropometric studies that will allow the available implants to be adapted and improved.

Objetivo: Comparar a mensuração do joelho realizada por meio de ressonância magnética com a medida obtida intraoperatoriamente, a fim de validar o método para estudos antropométricos.

Materiais e métodos: Foram estudados 20 joelhos em 20 pacientes portadores de osteoartrite submetidos a artroplastia total, entre agosto e dezembro de 2013. Realizaram-se seis medidas no fêmur distal e duas na tíbia proximal. As mensurações nas imagens foram feitas no plano axial, por meio do sistema informatizado da instituição. As mensurações intraoperatórias foram obtidas utilizando-se um paquímetro, após os cortes iniciais da artroplastia. Os parâmetros anatômicos foram os mesmos. O coeficiente de correlação intraclasses foi utilizado para avaliar a concordância nas medidas antropométricas de joelho realizadas pela ressonância magnética e pelo paquímetro de forma intraoperatória.

Resultados: A análise estatística revelou que existe concordância altamente significativa entre as medidas antropométricas do joelho conseguidas por meio do uso do paquímetro intraoperatoriamente e pela ressonância magnética.

Conclusão: A mensuração das dimensões dos joelhos osteoartríticos por meio de ressonância magnética apresentou-se como método semelhante à mensuração intraoperatória, sendo confiável para a realização de estudos antropométricos amplos que permitam a adequação e melhoria de implantes disponíveis.

Keywords: Anthropometry; Diagnostic imaging; Knee; Magnetic resonance imaging; Osteoarthritis; Prostheses.

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Figures

Figure 1
Figure 1
Schematic of the measurements. A: Distal right femur: 1, lateral condyle height; 2, medial condyle height; 3, total femur width; 4, lateral condyle width, 5, medial condyle width; 6, intercondylar width. B: Right proximal tibia: 1, anteroposterior width; 2, mediolateral width. Source: Loures et al.(8).
Figure 2
Figure 2
Intraoperative measurement. A: Right distal femur: measurement of the total width. B: Right proximal tibia: measurement of the mediolateral width.
Figure 3
Figure 3
MRI measurement. A: Right distal femur: measurement of the total width. B: Left proximal tibia: measurement of the anteroposterior width.
Figure 4
Figure 4
Comparison of measurements performed intraoperatively and by MRI.
See this image and copyright information in PMC

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