title: Principles of physics in surgery: the laws of mechanics and vectors physics for surgeons-part 2.
abstract: In this sequel, to an earlier article, we discuss the laws of Mechanics, Thermodynamics and Vectors as they apply to soft and bony tissues. These include the Laplace's Law as applied to colonic perforation, compression therapy, parturition, variceal rupture, disc herniations etc. The Pascal's Law finds use in hernia repair and the Heimlich maneuver. Trigonometrically derived components of forces, acting after suturing, show ways to reduce cut-through; the thickness and the bite of suture determines the extent of tissue reaction. The heating effect of current explains the optimum gap between the prongs of a bipolar cautery and the use of law of transfer of heat in determining relation between healthy wound healing and ambient temperature.
authors.forename: Anurag
authors.initials: A
authors.lastname: Srivastava
authors.forename: Akshay
authors.initials: A
authors.lastname: Sood
authors.forename: Parijat S
authors.initials: PS
authors.lastname: Joy
authors.forename: Shubhyan
authors.initials: S
authors.lastname: Mandal
authors.forename: Rajesh
authors.initials: R
authors.lastname: Panwar
authors.forename: Suresh
authors.initials: S
authors.lastname: Ravichandran
authors.forename: Sasmit
authors.initials: S
authors.lastname: Sarangi
authors.forename: John
authors.initials: J
authors.lastname: Woodcock