Sudden pain in the knee like pins and needles to consider synovitis, gout, meniscus injury and other causes. 1. Synovitis: synovial hyperplasia and hypertrophy occur due to joint strain or joint degeneration, secretion of fluid, if the thickened synovial membrane is stuck in the joint space causing joint pain, joint activity is limited. 2. Gout: sudden pain in the joints, accompanied by redness and swelling, limited movement, and uric acid test can be a clear diagnosis. 3. Meniscus injury: joint pain after knee sprain, joint popping, joint activity limitation, through the knee MRI film can be clearly diagnosed. Therefore, the knee joint suddenly hurts like a pinprick, if the rest does not alleviate the need to go to the hospital for examination to clarify the cause of the disease and targeted treatment.