Knee Pain Evaluation:

• Since your knee pain has persisted for two months and worsens with bending, a medical evaluation is recommended to determine the cause.

Vitamin D3 and Calcium Testing:

• Testing for vitamin D3 and calcium can be useful if there's suspicion of bone health issues like osteoporosis. However, knee pain alone may not always indicate a deficiency.

Possible Causes:

• Consider other causes such as ligament or meniscus injury, arthritis, or overuse. A physical exam and possibly imaging (e.g., X-rays) might be necessary.

Next Steps:

• Consult an orthopedic specialist or your primary care doctor. They can assess your symptoms and decide if vitamin D3 and calcium tests or other investigations are needed.