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The knee becomes swollen and large with severe pain, while the calf gradually thins, hence the name. This leads to tendon spasms preventing flexion and extension, caused by the flow and accumulation of Wind-Cold-Dampness pathogens. It is advisable to urgently select a prescription from the section on Wind-Damp Bi Syndrome for treatment. If the condition persists for a long time without recovery, it may spread to the buttocks and thighs, causing swelling and suppuration, leading to emaciation and death.

Main Prescription: Qiang Huo (Notopterygii Rhizoma et Radix), Fang Feng (Saposhnikoviae Radix), Bai Zhi (Angelicae Dahuricae Radix), Dang Gui (Angelicae Sinensis Radix), Niu Xi (Achyranthis Bidentatae Radix), Yi Yi Ren (Coicis Semen), Chuan Xiong (Ligustici Chuanxiong Rhizoma), Chuan Wu (Aconiti Kusnezoffii Radix), Du Zhong (Eucommiae Cortex), Bai Zhu (Atractylodis Macrocephalae Rhizoma), Mu Gua (Chaenomelis Fructus). Decoct in water and take orally.

If there is blood stasis, add Tao Ren (Persicae Semen) and Lou Lu (Lehmannia Cernua Root); if there are tendon spasms, add Mu Gua, Qin Jiao (Gentianae Macrophyllae Radix), and Wei Ling Xian (Clematidis Radix); if pain is severe, add Ru Xiang (Olibanum) and Mo Yao (Myrrha), grind into fine powder, and mix for oral administration. Alternatively, use Xiao Xu Ming Tang (Minor Xu Ming Decoction), adding Chuan Bi Xie (Dioscoreae Hypoglaucae Rhizoma), Chuan Lian Zi (Meliae Fructus), Qiang Huo, Du Huo (Angelicae Pubescentis Radix), and Mu Gua. When taking, mix in a small amount of She Xiang (Moschus). Subsequently, use Wu Ji San (Five Accumulations Powder) removing Ma Huang (Ephedrae Herba), decocted in wine.

For swollen and painful knees: Take a handful of Han Lian Cao (Ecliptae Herba) that turns black when broken, crush it, add a ball of glutinous rice and a piece of fermented rice cake (Jiu Zao), mix evenly, warm it, and apply to the knee. Wrap with oil-paper made from bamboo leaves and cloth, and apply heat熨 (ironing/warming). When the aroma of wine is detected, it will heal in a few days; if not fully healed, re-wrap and apply heat. Alternatively, stir-fry old fermented rice cake until hot and wrap for warmth.

Another Prescription: Wu Ming Yi (Hematitum, 5 qian), Di Gu Pi (Lycii Cortex, 3 qian), Ru Xiang, Mo Yao (each ground to 1.5 qian), She Xiang (She Xiang, 1 fen, ground evenly). Mix with Che Qian Cao (Plantaginis Herba) juice and wine for external application.

The *Classic* states: "Yang deficiency generates external cold." This is because Yang Qi cannot defend the exterior, thus causing aversion to cold. Specifically, there is severe aversion to cold in the back, and the pulse is floating and weak, indicating Yang deficiency. It is suitable to use drugs like Ren Shen (Ginseng Radix et Rhizoma). In severe cases, add Fu Zi (Aconiti Lateralis Radix Praeparata), 3 fen. For those who have been ill for a long time and suffer from aversion to cold, it is also appropriate to resolve stagnation. Aversion to cold is not true cold; it is clearly a heat syndrome. Extreme fire resembles water; when heat is extreme, one feels cold internally, but it is actually not cold. Some find slight relief with hot medicines because pungent flavors can disperse and temporarily open up stagnation. It is also said: "When fire-heat blazes within, cold must be swept away externally." Therefore, if it is not a cold syndrome, one must analyze the pathology and consult external symptoms to determine the use of cold or hot medications.

Main Prescription (for latent Cold Pathogens within): Ren Shen, Bai Zhu, Gan Jiang (Zingiberis Rhizoma), Zhi Gan Cao (Prepared Glycyrrhizae Radix et Rhizoma), Bai Fu Ling (Poria), Ban Xia (Pinelliae Rhizoma), Rou Gui (Cinnamomi Cortex), Wu Wei Zi (Schisandrae Fructus), Chen Pi (Citri Reticulatae Pericarpium). Decoct with Sheng Jiang (Zingiberis Rhizoma Recens) and Da Zao (Jujubae Fructus). Even in hot months, wear thick cotton clothes and add Fu Zi.

Qing Liang Yin (Cooling Drink): Aversion to cold with a flooding and rapid pulse, accompanied by eye pain, thirst, restlessness, and constipation, belongs to Heat. Huang Lian (Coptidis Rhizoma), Huang Qin (Scutellariae Radix), Zhi Zi (Gardeniae Fructus), Lian Qiao (Forsythiae Fructus), Bo He (Menthae Haplocalycis Herba), Gan Cao (Glycyrrhizae Radix et Rhizoma). Add Deng Xin Cao (Junci Medullia), decoct in water and take orally. If in summer, wearing thin cotton clothes, with a flooding and rapid pulse, short and red urine, and severe constipation, add Da Huang (Rhei Radix et Rhizoma) and Mang Xiao (Natrii Sulfas), which will lead to recovery. For drinkers suffering from aversion to cold, use Huang Qi (Astragali Radix, 2 liang) and Ge Gen (Puerariae Lobatae Radix, 1 liang), decoct and take orally. Once sweating occurs, the condition stabilizes.