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. 2020 Sep-Oct;28(5):229-232.
doi: 10.1590/1413-785220202805231351.

RELATIONSHIP BETWEEN THE KNEE AND HINDFOOT AXES IN PATIENTS WITH SEVERE KNEE OSTEOARTHRITIS

Henrique Mansur  1   2 , Felipe Almeida Rocha  1 , Pedro Guilme Teixeira DE Sousa  1 , Isnar Moreira DE Castro  1
Affiliations

RELATIONSHIP BETWEEN THE KNEE AND HINDFOOT AXES IN PATIENTS WITH SEVERE KNEE OSTEOARTHRITIS

Henrique Mansur et al. Acta Ortop Bras. 2020 Sep-Oct.

Abstract
in English, Portuguese

Objective: To evaluate the correlation between knee axis and hindfoot axis in patients with advanced gonarthrosis, and the association between ankle function and angular deformities.

Methods: 72 patients were enrolled in the study: 66% were women, and mean age was 58.7 years. The anatomical axis of the knee and hindfoot were measured by short knee radiographs and long axial view of the hindfoot.

Results: Among the study group, 79.2% presented varus knee (mean 15º ± 7.69º) and 20.8% valgus (mean 15.9º ± 7.7º). 63.9% had hindfoot varus (mean 8.5º ± 6.07º) and 36.1% valgus (mean 3.9º ± 3.92º) (p < 0.05). The mean value for the American Orthopaedic Foot and Ankle Society (AOFAS) score was 74.26 points, and values were significantly higher among patients with hindfoot varus (p < 0.05). We found no correlation between gender or AOFAS score and knee and hindfoot axes, nor between deformities in the knee and hindfoot axes (p > 0.05). The subgroup genu valgum - hindfoot varus presented a moderate correlation (r = 0.564; p < 0.05).

Conclusion: We found no association between the anatomical axes of the knee and hindfoot. Patients with gonarthrosis and hindfoot varus presented a better ankle function. Level of Evidence II, Prognostic Studies - Investigating the Effect of a Patient Characteristic on the Outcome of Disease.

Objetivo: Avaliar a correlação entre o eixo do joelho e o eixo do retropé em pacientes com gonartrose avançada, e a relação da função do tornozelo com as deformidades angulares.

Métodos: 72 pacientes, sendo 66% mulheres, idade média 58,7 anos participaram do estudo. Mediu-se o eixo anatômico do joelho e do retropé por meio de radiografias curtas dos joelhos e a incidência axial longa do retropé.

Resultados: da amostra, 79,2% apresentavam eixo do joelho em varo (média 15º ± 7,69º) e 20,8% valgo (média 15,9º ± 7,7º). 63,9% retropé varo (média 8,5º ± 6,07º) e 36,1% valgo (média 3,9º ± 3,92º) (p < 0,05). O valor médio do escore AOFAS foi 74,26 pontos, com valores significativamente maiores nos pacientes com retropé varo (p < 0,05). Não houve correlação entre o sexo ou o escore AOFAS e os eixos do retropé e do joelho, ou entre desvios no eixo do joelho e os desvios no eixo do retropé (p > 0,05). Observou-se uma associação moderada no subgrupo genuvalgo - retropé varo (r = 0,564; p < 0,05).

Conclusão: Não houve associação entre os eixos anatômicos do joelho e do retropé. Pacientes com gonartrose e retropé varo apresentaram melhor função do tornozelo. Nível de Evidência II, Estudos prognósticos - Investigação do efeito de característica de um paciente sobre o desfecho da doença.

Keywords: Ankle Joint. Arthroplasty; Knee; Knee. Radiography. Osteoarthritis; Replacement.

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Conflict of interest statement

All authors declare no potential conflict of interest related to this article.

Figures

Figure 1
Figure 1. Illustration of patient positioning for long axial view of the hindfoot. (
Figure 2
Figure 2. A: long axial view of the hindfoot, with hindfoot axis measure; B: illustration of hindfoot axis measurement in the long axial view of the hindfoot. (
See this image and copyright information in PMC

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