Resumo O pé torto congênito é uma das deformidades mais comuns ao nascimento. A inadequação ou ausência do tratamento provoca sérias limitações aos portadores desta condição. O tratamento inicial pelo método Ponseti garante resultados funcionais superiores a outras modalidades de tratamento propostas anteriormente, porém as recidivas e os pés negligenciados ainda são um desafio na atualidade. O entendimento da fisiopatologia da doença, da anatomia e biomecânica local e uma minuciosa avaliação clínica e radiológica dos pacientes são imprescindíveis para entendermos o limite do método e escolhermos o melhor tratamento.

Abstract Congenital clubfoot is one of the most common deformities at birth. The inadequacy or absence of treatment causes serious limitations for people with this condition. The initial treatment using the Ponseti method ensures functional results superior to other treatment modalities previously proposed. However, recurrences and neglected feet are still a challenge today. An understanding of the pathophysiology of the disease, as well as of the anatomy and local biomechanics and a thorough clinical and radiological evaluation of patients are essential to understanding the limits of the method and choosing the best treatment.

RESUMO Objetivo: O objetivo deste estudo é avaliar a confiabilidade intraobservador e interobservador do sistema de classificação de Waldenström modificado para a doença de Legg-Calvé-Perthes e avaliar a influência da experiência do profissional na avaliação. Métodos: Doze avaliadores analisaram 40 pares de radiografias pélvicas de pacientes com doença de Legg-Calvé-Perthes. Após duas semanas, nova avaliação foi realizada pelos mesmos avaliadores. Os índices Kappa e Kendall’s W foram usados para analisar a confiabilidade intraobservador e interobservador e para determinar a influência da experiência e perícia dos avaliadores. Resultados: O valor médio do kappa intraobservador foi de 0,394, com razoável concordância. O valor de Kappa interobservador foi de 0,243 na primeira avaliação (IC 95%, 0,227-0,259 e p < 0,0001) e 0,245 na segunda (IC 95%, 0,229-0,260 e p < 0,0001). Os valores W de Kendall obtidos para ortopedistas pediátricos, radiologistas e médicos residentes foram 0,686, 0,630 e 0,529 (p < 0,0001), respectivamente. Conclusão: A classificação de Waldenström modificada apresentou níveis moderados e razoáveis de concordância intraobservador e razoável concordância interobservador. O grau de experiência e especialização dos avaliadores influenciou o nível de concordância encontrado. Nível de Evidência II, Estudos diagnósticos - Investigação de um exame para diagnóstico.

ABSTRACT Objective: The purpose of our study is to evaluate intraobserver and interobserver reliability of modified Waldenström classification system for Legg-Calvé-Perthes disease and assess the influence of the professional’s area of expertise in the assessment. Methods: Twelve evaluators assessed 40 pairs of pelvic radiographs of patients with Legg-Calvé-Perthes disease. After two weeks, a new evaluation was performed by the same evaluators. Kappa and Kendall’s W indexes were used to evaluate both intraobserver and interobserver reliability and determine the influence of the evaluators’ experience and area of expertise. Results: The average intraobserver kappa value was 0.394, with a reasonable agreement level. The interobserver Kappa value was 0.243 in the first evaluation (95% CI, 0.227-0.259 and p < 0.0001) and 0.245 in the second evaluation (95% CI, 0.229-0.260 and p < 0.0001). The Kendall’s W values obtained for pediatric orthopedists, radiologists and resident physicians were 0.686, 0.630 and 0.529 (p < 0.0001), respectively. Conclusion: The modified Waldenström classification presented both moderate and reasonable levels of intraobserver agreement, and reasonable level of interobserver agreement. The evaluators’ degree of experience and area of expertise influenced the concordance level found. Level of Evidence II, Diagnostic Studies - Investigating a Diagnostic Test.

Objective: This retrospective study evaluated treatment with individually contoured molded bracing at early stages of the disease. Methods: We evaluated the medical records of patients undergoing treatment of Blount's disease with molded orthoses for medial decompression between 2010 and 2014. The deformity angle (Drennan's metaphyseal-diaphyseal angle) and Langenskiöld classification were measured before and after treatment by a pediatric orthopedic surgeon with over 5 years of practice, blinded for the study and patients. Results: The mean age was 2.57 years old. Four patients were female and six male. Half of the total sample had bilateral disease. The average deformity angle showed a statistically significant reduction after treatment (p <0.001). Gender and laterality did not statistically influence the change of the deformity angle after treatment (p> 0.05). Conclusion: The nightly use of molded orthoses for medial decompression was effective in reducing the metaphyseal-diaphyseal angle in Blount's disease in children under 3 years of age, regardless of gender and bilateral disease. Patients over 3 years old did not benefit from bracing. Level of Evidence IV, Case Series.