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Anteflexion of the spine is essential for many physical activities of daily living. However, this motion places the lumbar disks because it generats heavy load due to changes in the shape of the lumbar spine and can lead to low back pain. In older to reduce low back pain, here we proposed a wearable sensor system configuration that can estimate lumbosacral alignment and lumbar load by measuring the shape of the lumbar skin when the lumbosacral alignment changes. The shape of the lumbar skin and posture angle are measured by using curvature sensors and accelerometers. In addition, the system must be constructed in consideration of the physique, in order to absorb in a variety of human. We proposed this system by measuring the body parameters of anteflexion and studied the change in dimensions of the lumbar spine from changes in posture. By extracting the dimensions of the lumbosacral spine in X-ray images, the attitude angle, body surface area and the dimensions of the lumbosacral spine have relevance. The lumbosacral dimensions calibration method was developed by using that relation. Lumbosacral alignment estimation considering the difference in physiques is developed, and lumbosacral spine alignment was to improve the estimation accuracy. The proposed method could improve accuracy lumbosacral alignment estimation. 1. 緒 言 現在,腰痛に起因する問題は業種を問わず多くの作業を行う上で問題となっている.日本国内において,腰痛患 者に起因する医療費として約 820億円 (Itoh et al.,2013)が必要となっている.腰痛問題は国民生活に大きく関係 していることが,上記の数字より分かる.また,そのような腰痛は,国内以外問わず大きな問題となっている.日 1 X 線画像に基づく腰部負荷ウェアラブルセンサの提案と 腰仙椎アライメント推定 土谷 圭央*1,日下 聖*1,田中 孝之*2,松尾 祥和*3 小田 まこと*4,笹木 工*4,神島 保*5,山中 正紀*5 A proposal of lumbosacral load wearable sensor and lumbosacral alignment estimation based on X-ray image Yoshio TSUCHIYA*1, Takasi KUSAKA*1, Takayuki TANAKA*2, Yoshikazu MATSUO*3, Makoto ODA*4, Tsukasa SASAKI*4, Tamotsu KAMISIMA*5 and Masanori YAMANAKA*5 *1, *2 Hokkaidou University, Information Science and Technology, North-14, West-9, Kita-ku, Sapporo-shi, Hokkaido 060-0814, Japan *3 National Instiure of Technology, Hakodate College, 14-1 Tokura-cho, Hakodate-shi, Hokkaido 042-0953, Japan *4 Hokkaido University Hospital, North-14, West-5, Kita-ku, Sapporo-shi, Hokkaido 060-8648, Japan *5 Hokkaido University, Faculty of Health Sciences, North-12, West-5, Kita-ku, Sapporo-shi, Hokkaido 060-0812, Japan Received 2 March 2016