ABSTRACT
Verificar a prevalência dos tipos de fórmula metatarsal (FM) em pacientes com metatarsalgia primária (MP); comparar a variável "encurtamento do primeiro metatarso em relação ao segundo" (I/II) entre os grupos metatarsalgia (GM) e controle (GC); analisar a concordância intra e interobservadores pelos métodos das linhas transversais (MLT) de Morton e dos arcos (MA) de Hardy e Clapham. MÉTODOS: Estudo observacional transversal em 56 pacientes por meio de radiografias dos 112 pés, 56 do GM e 56 do GC avaliados entre dezembro de 2012 e junho de 2013. As mensurações foram feitas por três residentes do terceiro ano em ortopedia, com treinamento prévio dos métodos e uso de template. RESULTADOS: Não houve concordância em nenhum dos dois métodos verificados pelos gráficos de Bland-Altman, apesar de o coeficiente de correlação intraclasses apresentar uma alta reprodutibilidade intra e interobservadores pelo MLT (0,78 e 0,85) e moderada pelo MA (0,73 e 0,60). Na comparação entre os grupos, observou-se diferença estatística (p ≤ 0,05) com um encurtamento do primeiro metatarso (3,39 mm) maior no GC em relação ao GM (2,14 mm). Nos pacientes com MP, a FM tipo index minusfoi mais prevalente pelo MLT (62,5%) e o tipo zero pluspelo MA (71,4%). CONCLUSÃO: Foi observado que a prevalência da FM depende do método de mensuração. Em ambos os grupos houve predomínio do encurtamento do primeiro metatarso. Não houve concordância intra e interobservadores em nenhum dos métodos propostos.
The aims of this study were (i) to ascertain the prevalence of different types of metatarsal formula among patients with primary metatarsalgia; (ii) to compare the variable of "shortening of the first metatarsal in relation to the second" (I/II) between the metatarsalgia and control groups; and (iii) to analyze the intra and interobserver concordance by means of Morton's transverse line method and Hardy and Clapham's arc method. METHODS: A cross-sectional observational study was conducted on 56 patients by means of radiographs on their 112 ft, of which 56 were in the metatarsalgia group and 56 in the control group. The evaluations were done between December 2012 and June 2013. The measurements were made by three third-year orthopedics residents with prior training in the methods used, and a template was used. RESULTS: There was no concordance between the two methods, as shown by Bland-Altman plots, although the intraclass correlation coefficients showed that the intra and interobserver reproducibility was high using the transverse line method (0.78 and 0.85) and moderate using the arc method (0.73 and 0.60). Comparison between the groups showed that there was a statistical difference ( p≤ 0.05) such that there was greater shortening of the first metatarsal (3.39 mm) in the control group than in the metatarsalgia group (2.14 mm). In the patients with primary metatarsalgia, the index minusmetatarsal formula was more prevalent according to the transverse line method (62.5%) and the zero plustype according to the arc method (71.4%). CONCLUSION: In the present study, it was observed that the metatarsal formula prevalences depended on the measurement method. In both groups, shortening of the first metatarsal predominated. There was no intra or interobserver concordance in either of the two proposed methods.