My date is May 4th for rthr and July 1 for lthr. Chose local experienced OS for anterior instead of hour drive to center city Philadelphia for world renowned surgeon and blhr...I'm reasonable young, 55, and athletic, but have knee issue and fear can't rehab two at a time. A bit of fear now, but much encouragement has come my way from others and this forum...just somewhat unsure two would be better...can't wait to get this over with.