1. 1) Hoberman M, Basmajian JV: Crutch and cane exercises and use, Basmajian JV (Ed.), Therapeutic exercise, 4th ed. Baltimore: Williams and Wilkins, 1984, pp 267-284.
2. 2) Hashimoto T: Tsue•hokouhozyogu no syurui to dousasyougai ni oujita mochiikata no youtenn. Rigaku Ryoho, 2010, 27: 192–207 (in Japanese).
3. 3) Sasaki S, Nose Y, Shimada S, et al.: The biomechanics of crutches and canes. Rigaku Ryoho, 2000, 17: 814–823 (in Japanese).
4. 4) Sasaki S, Shimada S, Nakayama Y, et al.: Denkikakudokei niyoru syukansetu no undoukaiseki: tokuni hozyogu wo mochiita idoudousa nituite. Jpn Phys Ther Assoc, 1987, 14: 178 (in Japanese).
5. 5) Lowman EW, Rusk HA: Self-help devices, crutch prescription: measurement. Postgrad Med, 1962, 31: 303–305.