Hi,
The pain you are experiencing, which starts in your buttocks and radiates down the leg to your knee, is commonly known as sciatica. Sciatica is not a condition in and of itself, but a symptom of an underlying condition that is putting pressure on the
sciatic nerve.
In your case, the pain may be due to a pulled muscle, particularly if you have been engaging in physical activity that requires a lot of hip or leg movement. However, given that you also have RA, the pain may be related to your condition. RA is an autoimmune disorder that causes inflammation and damage to the joints, which can lead to
nerve irritation and compression.
Other possible causes of sciatica include a
herniated disk,
spinal stenosis (narrowing of the spinal canal), or
piriformis syndrome (compression of the sciatic nerve by the
piriformis muscle in the buttocks). Your provider may perform a physical exam, imaging tests (such as an X-ray or MRI), or nerve conduction studies to determine the cause of your symptoms. Treatment may include pain medication,
physical therapy, corticosteroid injections, or in some cases, surgery.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Priyanka, General & Family Physician