A mathematical analysis of alternative sternal wound closures – An aid to reducing cardiac surgical mortality

Article type: Research Article

Authors: John, Lindsay C.H.

Affiliations: Department of Cardiothoracic Surgery, Kings College Hospital, Denmark Hill, London SE5 9RS, UK Tel.: + 44 20 3299 4365; Fax: +44 20 3299 3433; E-mail: lindsay.john@kch.nhs.uk

Abstract: Sternal dehiscence is an important complication of cardiac surgery. A simple mathematical analysis is described for determining the relative strength (S) of different types of sternal closure. This is based upon resolving the tensions within the segments of a sternal wire to derive a dehiscence force. The strength of the closure (S) is the ratio of the volume of sternum which the dehiscence force acts upon to the dehiscence force itself. The derived S values varied from 4.3 for a closure using 6 transverse wires to 11.4 for a closure using the Modified Technique. The analysis suggested that closures which redistribute the transverse force to act obliquely upon a greater volume of sternum, such as the Modified Technique, are less likely to fail.

Keywords: Sternum, cardiac surgery, surgical wound dehiscence

Journal: Bio-Medical Materials and Engineering, vol. 18, no. 1, pp. 35-44, 2008