X-rays are useful for identifying certain structural issues within the knee joint, such as fractures, dislocations, bone spurs, and signs of osteoarthritis. However, X-rays typically do not show soft tissue problems, such as ligament or cartilage injuries, which are common causes of knee pain. Therefore, while an X-ray can provide valuable information about the bones in the knee joint and any obvious abnormalities, it may not always directly reveal the cause of knee pain.

If a person is experiencing knee pain, and soft tissue problems are suspected, additional imaging tests such as MRI (Magnetic Resonance Imaging) or ultrasound may be necessary to provide a more detailed evaluation of the soft tissues, including ligaments, tendons, and cartilage. The diagnosis of knee pain often involves a comprehensive assessment by a healthcare professional, including a physical examination and possibly other diagnostic tests or procedures, depending on the individual case.