The Queen star checked into hospital for an operation to fix a chronic problem which has plagued him for some time, and he sent a message to his Twitter followers just hours after the surgery to inform them it had been a success.
In a message posted on the social networking website, he writes: "I'm through!!! With a shiny new knee. This no walk in the park (!) but for 1st time in months I feel optimistic and free of that OLD pain."
May, 66, also thanked his loyal fans for cheering him up after the operation, adding: "Thanks so much for the great messages - it means a lot."
Thanks so much for the Get Well messages. Today was tough but they keep you busy, and I'm in really good shape, already way better. Bri— Dr. Brian May (@DrBrianMay) August 8, 2013