Knee joint pain related to the bones is often caused by conditions such as Osteoarthritis, vitamin deficiencies, or strain on the joint. Treatment usually includes rest, gentle knee-strengthening exercises, weight management, and using hot or cold compresses to reduce pain and swelling. Doctors may also recommend calcium and vitamin D supplements, pain-relief medicines, or physiotherapy to improve joint strength and mobility. Avoid excessive climbing of stairs, squatting, or heavy lifting. If the pain persists or worsens, it is best to consult an orthopedic doctor for proper evaluation and treatment.