• Yohei Takahashi, Ikuyo Kou, Yoji Ogura, Atsushi Miyake, Kazuki Takeda, Masahiro Nakajima, Shohei Minami, Noriaki Kawakami, Koki Uno, Manabu Ito, Ikuho Yonezawa, Takashi Kaito, Haruhisa Yanagida, Kei Watanabe, Hiroshi Taneichi, Katsumi Harimaya, Yuki Taniguchi, Toshiaki Kotani, Taichi Tsuji, Teppei Suzuki, Hideki Sudo, Nobuyuki Fujita, Mitsuru Yagi, Kazuhiro Chiba, Katsuki Kono, Tsuyoshi Sakuma, Tsutomu Akazawa, Kotaro Nishida, Kenichiro Kakutani, Hideki Shigematsu, Takahiro Iida, Satoru Demura, Naobumi Hosogane, Eijiro Okada, Masaya Nakamura, Morio Matsumoto, Kota Watanabe, and Shiro Ikegawa.
• Laboratory of Bone and Joint Diseases, RIKEN Center for Integrative Sciences, Tokyo, Japan.
• Spine. 2018 May 15; 43 (10): 688-692.

Study DesignCase-only study.ObjectiveThe aim of this study was to confirm the association of rs11190870 with adolescent idiopathic scoliosis (AIS) severity in Japanese patients with AIS.Summary Of Background DataAlthough the association of rs11190870 with AIS susceptibility is replicated in multiple ethnics, the association of rs11190870 with curve severity is controversial. Since the previous studies are of small, we performed a replication study using far larger number of patients than previous studies.MethodsA total of 1860 Japanese patients with AIS who had reached skeletal maturity or undergone surgical fusion were included in the study. We evaluated the association between rs11190870 and AIS progression for the entire group, and then for patients grouped according to a severe curve (a Cobb angle of ≥40°) or mild curve (a Cobb angle <30°). Because braces could affect the results of the present study, patients in the mild-curve group were divided according to whether or not they had worn a brace. We then evaluated associations between rs11190870 genotype and curve severity in these groups.ResultsThe mean Cobb angles were 54.8° ± 12.1° in the severe-curve group and 24.4° ± 4.0° in the mild-curve group. The difference in rs11190870 risk-allele frequency between the severe- and mild-curve groups was evaluated. No significant differences were observed. We then examined the association of rs11190870 risk-allele frequency between patients in the mild- and severe-curve groups using the χ test for three models, and found a marginal association between rs11190870 and curve severity in the dominant model (P = 0.035, odds ratio = 1.51).ConclusionWe found no association between rs11190870 and curve severity using the criteria of previous study. However, we found a marginal association between rs11190870 and curve severity. Large-scale replication studies that consider skeletal maturity and brace history, including replication studies in other ethnic groups, would be helpful for clarifying the association.Level Of Evidence4.

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