What is the reason for the sound when a newborn's knee is straightened?

Patient's question:

A friend of mine recently encountered this issue and stayed in the hospital for a period of time. When I visited him, he said he was a bit in pain and couldn't sleep at night, which greatly affected his condition.
Why do newborn babies make a popping sound when their knees are straightened?

Doctor's answer:

Hello, the consideration you described is likely rheumatoid arthritis. It can be treated with topical application of Zheng Hong oil, or acupuncture can also be used to strengthen physical exercise and enhance physical fitness.
Hello, facial paralysis is caused by facial neuritis. The main cause of onset is due to cold wind blowing on the face, leading to spasm of the microvessels nourishing the facial nerve, resulting in local tissue ischemia and hypoxia. Some also believe it may be related to viral infection, while others suggest it could be an immune response.

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