It's been half a month since the bone bruise—why is my knee still swollen and has joint effusion?

Under normal circumstances, if the knee remains swollen and there is joint effusion two weeks after a bone contusion, it may be due to improper treatment, wound infection, fracture, or other factors. Specific analyses are as follows:

1. Improper Treatment

If joint effusion occurs after a bone contusion, improper management may lead to persistent knee swelling and ongoing fluid accumulation. For example, failure to promptly apply ice, rest adequately, or use pain-relieving medications can delay recovery. If pain is severe, patients may take loxoprofen sodium tablets, acetaminophen and tramadol tablets, or similar medications under medical guidance to relieve symptoms.

2. Wound Infection

After a bone contusion, if the wound is not cleaned promptly or properly managed, infection may occur. An infection can cause increasing joint fluid and persistent knee swelling. In cases of severe infection, topical ointments such as compound polymyxin B ointment or mupirocin ointment may be used as directed by a physician.

3. Fracture

If a bone contusion is not treated promptly and effectively, it may progress to a fracture. A fracture can result in persistent joint effusion and knee swelling. If a fracture has occurred, immediate hospitalization for surgical reduction is necessary.

In addition, conditions such as osteoarthritis, meniscus injury, or rheumatoid arthritis may also contribute. It is recommended that patients seek timely evaluation at a reputable medical facility when experiencing the above symptoms, and receive appropriate treatment to prevent worsening of the condition.