结论：较之正常人更短的胸骨可能与脊椎骨骺骨软骨病的出现有关。

Conclusion. The smaller length of sternum than the normal has a possible correlation with the appearance of Scheuermann disease.

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关于脊椎骨骺骨软骨病的病因学术界提出了很多假说，但是其真正的原因尚不清楚。

Summary of Background Data. Many theories have been proposed for the etiology of Scheuermann disease, but the true cause remains unclear.

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目的探讨X-连锁迟发性脊椎骨骺发育不良（SEDL）基因逃避X染色体失活（XCI）及与临床表型的关系。

Objective To explore the relationship between X - linked spondyloepiphyseal dysplasia tarda (SEDL) gene escaping X chromosome inactivation( XCI) and SEDL phenotype.

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