Prince Xuan of Jin Sima Yi could turn and see his own back.
Li Rong 李冗, Du yi zhi 獨異志 (Outstanding Fantastic Stories), 上1.2 (Tale 11):
Li Rong 李冗, Du yi zhi, 獨異志 (Outstanding Fantastic Stories) in Du yi zhi, Xuanshi Zhi 獨異志，宣室志 (Outstanding Fantastic Stories, Stories from the Chamber of Dissemination), edited by Zhang Yongqin 张永钦 and Hou Zhiming 侯志明 (Beijing: Zhonghua shuju, 1983)
Monk Li of Xichuan had a disciple whose back was so bent that they could not look upwards, and because the medicine market had closed, saw a Daoist, who said: “If the scholar has money, I beg two or three hundred cash for wine.” The scholar said: “I am poor and lack money, but there is some weak wine in my residence; will you have a drink with me?” The Daoist accepted happily and accompanied him. When the wine was half finished, the Daoist said: “Why is your back curved?” The scholar said: “Unfortunately I happened to suffer this illness; there is nothing to be done about it.” The Daoist therefore took out thirty grains of medicine, saying: “In the coming days, at the fifth watch (3-5am) face east, take these with freshly drawn water, and do not become alarmed if you feel a slight pain.” The scholar did as instructed and, having taken the medicine, felt an extreme and unbearable dryness, turning and thrashing on his bed and regretting it bitterly. Nevertheless, every time he stretched himself he felt slightly more comfortable, and by the next day his back was quite straight.
Anon., Huhai xinwen yijian xuzhi, 後1.143 (Tale 251):
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.), Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986).