Faculty Advisor

Billiar, Kristen


The use of screw-plate fixation after sternotomy is becoming more prevalent but no current device is capable of supplying both the compressive and locking forces needed to fixate the plate to the bone. The goal of project is to create an anti-wobble screw-plate fixation device capable of reducing sternal displacement on a clinically relevant scale by the use of a modified one piece, two-part screw that allows for delayed locking. The device was designed and manufactured to clinical specifications and cyclically tested from 0 to 25N for 15,000 cycles on human sterna. The displacements for standard and anti-wobble systems were respectively 1.45mm and 0.65mm. The results show the anti-wobble system minimized displacement and with minor improvements a clinically relevant product was developed.


Worcester Polytechnic Institute

Date Accepted

April 2011


Biomedical Engineering

Project Type

Major Qualifying Project



Advisor Department

Biomedical Engineering