鹤膝风肿生于膝，上下枯细三阴虚，风寒湿邪乘虚入，痛寒挛风筋缓湿。
【注】此证一名游膝风，一名鼓捶风，痢后得者为痢风。单生者轻，双生者最重。因
循日久，膝肿粗大，上下股胫枯细。由足三阴经虚，风、寒、湿邪乘虚而入，为是病也。
膝内隐痛寒胜也，筋急而挛风胜也，筋缓无力湿胜也。初肿如绵，皮色不变，亦无 热，
疼痛日增，无论单双，俱宜服五积散汗之；次服万灵丹温散之，外敷回阳玉龙膏；常服换
骨丹或 螂丸，以驱其邪。若日久不消，势欲溃者，宜服独活寄生汤，或大防风汤补而
温之，痛甚加乳香。溃后时出白浆，浮皮虽腐，肿痛仍前，不可用蚀药，只宜芙蓉叶、菊
花叶各五钱，研末，大麦米饭拌均贴之，亦可止疼。或用豆腐渣蒸热捏作饼，贴之亦可。
此证系外证中之败证也，收功甚难。
\r鹤膝风图\p04-34a196.bmp\r
换骨丹
苍术（四两） 枸杞（二两五钱） 茄根（洗，二两） 当归 牛膝 败龟板 防风 秦艽 独活
萆 羌活 蚕沙 松节 虎骨（酥炙，各一两）
共享酒浸，晒干，研为细末，酒糊为丸，如梧桐子大，每服三钱，食前白滚水送下。
【方歌】换骨丹归膝枸苍，龟板风艽独 羌，蚕沙松节茄根虎，鹤膝风生服最良。
螂丸
螂（即全蝎生者，一个） 白芷 桂心 安息香 阿魏（以上各用童便、酒炒熟） 威灵仙 白附
子（童便、酒炒） 当归 羌活 桃仁（童便、酒炒） 牛膝 北漏芦 地骨皮 白芍（酒炒，各一两） 乳
香没药（二味用童便、酒炒，各七钱五分）
共研末，炼蜜为丸，桐子大，每服三钱，空心温酒送下。
【方歌】 螂丸治鹤膝风，芷桂安息魏威灵，白附归羌桃乳没，膝漏骨皮芍蜜成。
五积散（见内痈部肾痈）
大防风汤（见股部附骨疽）
万灵丹 回阳玉龙膏（俱见肿疡门）
独活寄主汤（见本部膝眼风）
Swelling of Crane's Knee Wind (He Xi Feng) occurs at the knee. The upper and lower limbs appear emaciated and thin due to deficiency of the Foot Three Yin meridians (Liver, Spleen, Kidney). Wind, cold, and dampness pathogens invade when the body's resistance is weak. Symptoms include: pain and aversion to cold indicate dominance of cold; tendon spasm and contraction indicate dominance of wind; flaccid tendons and weakness indicate dominance of dampness.
[Note] This condition is also known as "Wandering Knee Wind" (You Xi Feng) or "Drum-Beating Wind" (Gu Chui Feng). When contracted after dysentery, it is called "Dysentery Wind" (Li Feng). Unilateral occurrence is mild; bilateral occurrence is severe. If neglected for a long time, the knee becomes swollen and coarse, while the thighs and calves become emaciated and thin. This arises from deficiency in the Foot Three Yin meridians, allowing wind, cold, and dampness pathogens to invade, resulting in this disease. Hidden pain and cold sensation inside the knee indicate excess cold; urgent tendon contraction indicates excess wind; relaxed tendons and weakness indicate excess dampness. In the early stage, swelling feels soft like cotton, skin color remains unchanged, and there is no heat sensation, but pain increases daily. Whether unilateral or bilateral, it is appropriate to take Wuji San (Wuji San, Five Accumulations Powder) to induce sweating; subsequently take Wanling Dan (Wanling Dan, Ten Thousand Spirits Pill) to warm and disperse, and apply Huiyang Yulong Gao (Huiyang Yulong Gao, Restore Yang Jade Dragon Ointment) externally; commonly take Huangu Dan (Huangu Dan, Bone-Replacing Pill) or Lang Wan (Lang Wan, Scorpion Pill) to expel pathogens. If the condition persists for a long time without resolving and shows signs of impending ulceration, it is appropriate to take Duhuo Jisheng Tang (Duhuo Jisheng Tang, Angelicae Pubescentis Decoction with Multisepal Starflower Root) or Da Fangfeng Tang (Da Fangfeng Tang, Major Saposhnikovia Decoction) to tonify and warm. For severe pain, add Ruxiang (Frankincense). After ulceration, if white serous fluid frequently oozes, and although the superficial skin is necrotic, pain and swelling persist, corrosive medicines should not be used. Instead, use Furong Ye (Hibiscus Mutabilis Leaf) and Juhua Ye (Chrysanthemum Leaf), each 5 qian, grind into fine powder, mix evenly with barley rice paste, and apply as a poultice to relieve pain. Alternatively, steam tofu dregs until hot, shape into cakes, and apply; this is also effective. This condition belongs to the refractory category of external diseases and is difficult to cure.
Huangu Dan (Bone-Replacing Pill)
Ingredients: Cangzhu (Rhizoma Atractylodis Macrocephalae, 4 liang), Gouqi (Fructus Lycii, 2.5 liang), Qiegen (Radix Solani Melonganae, washed, 2 liang), Danggui (Radix Angelicae Sinensis), Niuxi (Radix Achyranthis Bidentatae), Baiguiban (Carapax et Plastrum Testudinis), Fangfeng (Radix Saposhnikoviae), Qinjiao (Radix Gentianae Macrophyllae), Duhuo (Radix Angelicae Pubescentis), Bixie (Rhizoma Dioscoreae Hypoglaucae), Qianghuo (Rhizoma et Radix Notopterygii), Canasha (Faeces Bombyx Batryticatae), Songjie (Ramulus Pinus), Hubone (Os Tigris, prepared with butter, each 1 liang).
Preparation and Administration: Soak together in wine, dry, grind into fine powder, make pills with wine paste, size of Sophora japonica seeds. Take 3 qian per dose, administered with plain boiled water before meals.
[Pill Formula Song] Huangu Dan contains Danggui, Niuxi, Gouqi, Cangzhu, plus Baiguiban, Fangfeng, Qinjiao, Duhuo, Qianghuo, Canasha, Songjie, Qiegen, and Hubone; it is most effective for treating Crane's Knee Wind.
Lang Wan (Scorpion Pill)
Ingredients: Quanxie (Scorpio, i.e., fresh whole scorpion, 1 piece), Baizhi (Radix Angelicae Dahuricae), Guixin (Cortex Cinnamomi), Anshixiang (Resina Benzoinis), Awei (Resina Ferulae) — all these are stir-fried with child's urine and wine; Weilingxian (Radix et Rhizoma Clematidis), Baifuzi (Rhizoma Typhonii, stir-fried with child's urine and wine), Danggui (Radix Angelicae Sinensis), Qianghuo (Rhizoma et Radix Notopterygii), Taoren (Semen Persicae, stir-fried with child's urine and wine), Niuxi (Radix Achyranthis Bidentatae), Beiloulu (Radix Euphorbiae Humifusae), Digupi (Cortex Lycii), Baishao (Radix Paeoniae Alba, stir-fried with wine, each 1 liang), Ruxiang (Resina Olibani), Moyao (Resina Myrrhae) — these two are stir-fried with child's urine and wine, each 7.5 qian.
Preparation and Administration: Grind together into powder, make pills with refined honey, size of Sophora japonica seeds. Take 3 qian per dose, administered with warm wine on an empty stomach.
[Pill Formula Song] Lang Wan treats Crane's Knee Wind, containing Baizhi, Guixin, Anshixiang, Awei, Weilingxian, Baifuzi, Danggui, Qianghuo, Taoren, Ruxiang, Moyao, combined with Beiloulu, Digupi, Baishao, formed with honey.
Wuji San (See Internal Abscess Section, Kidney Abscess)
Da Fangfeng Tang (See Thigh Section, Deep-Seated Bone Carbuncle)
Wanling Dan, Huiyang Yulong Gao (Both See Ulcerative Disease Section)
Duhuo Jisheng Tang (See This Section, Knee Eye Wind)