It's early on a Tuesday morning in Ambulatory Surgery Room No. 1 at the Hospital for Special Surgery in New York City. The Talking Heads pulse througha pair of portable speakers, nurses buzz to and fro, andDr. John MacGillivray dives knee-deep into his latestsurgery. MacGillivray, a U.S. Ski Team doctor, makesa two-and-a-half-inch incision across patient Julie Bevad'sleft knee, opening it just enough to isolate Bevad's rubberypatellar tendon, which runs down the front of the joint.Using a surgical saw, MacGillivray and his assistant, Dr.Ross Henshaw, remove the middle third of the tendon,along with chips of bone on each end, and place it on ameasuring board. The graft, about four inches long, willbe Bevad's new anterior cruciate ligament. "Perfect, saysMacGillivray. "That's the best cut I've seen.