I Was In A Motorcycle Accident Over A Month Ago
Possibly injury of soft tissues of knee.
Detailed Answer:
Hello dear, welcome to Ask a doctor's service.
I read your query and here is my advice.
You possibly didn't have a fracture the day of accident but possibly damaged soft tissues of knee such tendons or ligaments which may still cause pain and swelling after a month. I think you may need to do an MRI to evaluate the knee conditions and what is causing it.
Possibly you started your physical activity now or overused the knee.
The physical activity after a knee injury may need to start gradually, doing physical therapy first.
You can use ice compresses on knee ,put a towel then ice over it, use anti-inflammatory drugs such ibuprofen for swelling and pain , have rest and avoid strenuous activities.
Visit an orthopedist and do an MRI.
Hope I have answered the question.
Let me know if I can assist you further.