My child is seven years old and hasn’t shown any signs of losing baby teeth. This situation concerns us as parents, and we hope the doctor can provide some advice.

My daughter is almost two years old, and even when she was not yet able to sit, when held by adults in a 90-degree position, she would lift her two legs vigorously, straightening her legs and toes. When tired, she would put them down to rest and then tense them again. She would be so focused that she would even sweat, and people said it was just her growing. I didn’t pay much attention to it.

Considering your symptoms, and assuming there is no fracture in the knee joint, it is likely a joint capsule injury with fluid accumulation inside the joint. It is recommended to rest for 1-2 weeks, minimize activity as much as possible, apply a warm compress to the injured area with a towel to help absorb the fluid inside the joint. If the pain persists, it is advised to undergo an MRI to rule out damage to the meniscus and cruciate ligaments within the knee joint. Therefore, it is best to determine the cause of the condition and then treat accordingly.