Animated knots creator discusses use of constrictor knot in surgery

Published at 11:45 a.m. on March 21, 2014 | Modified at 11:45 a.m. on March 21, 2014

Hilton Head Island resident and retired anesthesiologist Alan Grogono uses a machine to test the strength and durability and speaks about the knots he ties, like the constrictor knot, while sitting at his workbench in the garage.

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