OBJETIVO: Os autores discutem a correlação existente entre a cifose torácica aumentada, em pacientes portadores de Dorso Curvo Postural (DCP) ou Doença de Scheuermann (DS), e a contratura dos músculos isquiotibiais. Esta relação é pouco estudada na literatura. MÉTODOS: No período de junho a dezembro de 2003, foram analisados 38 pacientes. Dentre os pacientes, 26 (68,4 %) eram do sexo masculino e 12 (31,6%) do sexo feminino. A idade mínima foi de 10 anos e a máxima de 20 anos, com média de 15,36. Encontramos 20 (52,6%) pacientes portadores de Doença de Scheuermann e 18 (47,4%) com Dorso Curvo Postural. RESULTADOS: De todos os 38 pacientes estudados, 32 (84,2%) apresentaram contratura dos isquiotibiais, o que foi estatisticamente significante (pOBJECTIVE: The authors discuss the existent correlation between augmented thoracic kyphosis in patients with juvenile Kyphosis or Scheuermann`s disease and hamstrings contraction. This correlation is marginally addressed by existing studies. METHODS: Between June and December 2003, 38 patients belonging to the Spine Group at the Department of Orthopaedics from Santa Casa de São Paulo, Brazil, were analyzed. Among them, 26 (68.4%) were males and 12 (81.6%) were females. The youngest age was 10 and the oldest one was 20 years, with an average of 15.36. Twenty (52.6%) patients presented with Scheuermann´s disease and 18 (47.4%) with juvenile Kyphosis. RESULTS: From all 38 patients under study, 32 (84.2%) presented hamstring contracture, which was statistically significant (p<0.001). 85% of patients presenting only Scheuermann`s disease and 83.3% of patients with only juvenile Kyphosis had contracture. Conclusion: There was no statistically significant difference between contraction percentage in Scheuermann`s disease patients versus juvenile Kyphosis patients (p=0.61).