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Xu Keyu treated the wife of Shen Zhonggang from Wuxing. The patient suffered from swelling and pain in the knees, with the right side being more severe initially. When hot compresses were applied to one knee, the pain shifted to the other; applying them to the left caused the pain to shift to the right. If both were compressed simultaneously, rumbling noises occurred in the chest. Subsequently, the entire back felt as if beaten by ten thousand sticks, except for the head. During attacks, the face turned dark blue/black, and the pulse was indistinguishable. The condition started in the morning and ceased at dusk, leaving the body extremely weak daily. Physicians, upon observing the complexion, retreated, deeming it incurable. After examining the pulse, Xu said, "This is caused by the invasion of dampness (Shi), followed by injury to the Gallbladder due to fright (Jing). Although the disease is severe, it is treatable." He then instructed that the chest be bound tightly with a cloth for a moment, after which the throat was stimulated to induce vomiting, expelling several dou of greenish-white phlegm and saliva. Once the vomiting subsided, Xu stated, "Now, when this disease attacks, if the qi rises to the abdomen, it will not reach the face, and the face will not turn cyanotic; if it leads to dizziness and knee pain, continuing the hot compression will stop the rumbling from reaching the chest. By the third watch (midnight), symptoms stabilized completely, exactly as Xu predicted. After three dusk periods, the disease did not recur, and she recovered."

Yu Zhen commented: Dampness generates phlegm, and fright obstructs phlegm. The ancients spoke of "fright-phlegm flooding the Gallbladder," which explains the cyanotic complexion. Phlegm moves with the qi, causing pain through ascending and descending movements. Recovery after a single emesis indicates mastery of Dai Yuanli's therapeutic methods.

Zhang Tianze, Prefect, suffered from swelling and pain in the left knee, fullness and stagnation in the chest and diaphragm, reduced appetite, occasional vomiting, dizziness, and copious phlegm obstruction. He felt particularly fatigued in the late afternoon. Treatment with scallion hot compression (Cong Yun Fa) and Liu Jun Zi Tang (Six Gentlemen Decoction) added with Pao Jiang (Roasted Ginger) caused all symptoms to recede immediately, and food intake slightly increased. Subsequently, Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction) added with Man Jing Zi (Vitex Fruit) cleared the head and eyes, restoring health to the limbs. Intermittently, Da Fang Feng Tang (Great Saposhnikovia Decoction) was administered for over ten doses, and Bu Zhong Yi Qi Tang for over thirty doses, leading to complete resolution.

A woman suffered from fever and dry mouth, along with irregular menstruation. Half a year later, she experienced limb fatigue and swelling and pain in both knees. She was treated for deficiency of blood and dryness of fire in the Three Yin Meridians of the Foot using Liu Wei Di Huang Wan (Six-Ingredient Pill with Rehmannia). After more than two months, her physique gradually strengthened, food intake increased, and knee swelling subsided. She recovered after half a year.

Yu Zhen commented: This is a medical case record by Xue Ji (Li Zhai). Although only two cases are recorded, the therapeutic methods are comprehensive. Generally, Crane's Knee Wind (He Xi Feng) results from deficiency of the Three Yin Meridians of the Foot, allowing cold-dampness to enter due to deficiency. Therefore, the four formulas used are essential. If suppuration occurs or after ulceration, Shi Quan Da Bu Tang (Ten Complete Great Tonifying Decoction) is appropriate. If accompanied by dizziness, expectoration, and frequent urination, Ba Wei Wan (Eight-Ingredient Pill) should be added. These are key methods. Only in the initial stage is it excellent to use scallion hot compression or Lei Huo Zhen (Thunder Fire Needle) to resolve it internally. Additionally, for prevention, mugwort wool can be sewn into knee guards, lined with red silk against the skin, worn day and night without removal, to prevent this disease.