Last month, the palace said the queen had strained a ligament in her right knee and was using a cane to walk. The palace said the monarch had hurt herself during a visit to Newmarket, in Suffolk, eastern England, before Christmas.
The palace said the queen was admitted to the private hospital on Sunday night. The minor operation took 45 minutes and was conducted by a team led by the queen's orthopedic surgeon, Roger Vickers.
"It went very well," and the queen is expected to leave the hospital Tuesday morning, the palace said. She will rest at the royal Sandringham estate over the next two weeks, then resume a limited program of engagements until she has made a full recovery, the statement said.
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