Abstract
The aim of the study was to develop a simple and effective method of determining acetabular component ante-version at the time of surgical implantation. A technique using a laser beam was developed, and put into practice.
Ante-version and closure of the component determine the three-dimensional position. Ante-version is particularly difficult to judge because of lack of perspective from the surgeons position. Using a standard industrial laser, a protractor and a tripod, a beam is projected across the operative field, allowing the acetabular impactor handle to be lined up, at predetermined angle. The patient needs to be positioned accurately preoperatively, and secured in a stable fashion to the operating table. The operating table needs to be parallel to the floor.
We have found this technique easy-to-use. It is less invasive than the computer navigation techniques requiring skeletal fixation, but it does not provide as much information. It is simple, inexpensive, easily transportable. As far as anteversion measurement is concerned, because of the longer distance of projection it provides a greater degree of confidence in alignment, than the standard short jigs which attach to the handle of the acetabular impactor.
The abstracts were prepared by David AF Morgan. Correspondence should be addressed to him at davidafmorgan@aoa.org.au
Declaration of interest: a
