Exact re-orientation of the acetabulum is very important as under-correction or over-correction result in inferior outcome. One way to control the degree of correction is to perform x-rays of the pelvis, perioperatively. This, however, is time-consuming as the surgeon and the whole team has to wait for the development of the X-rays, and maybe has to perform several trials before the orientation of the acetabulum is acceptable.

The problem using fluoroscopy is that only one hip can be seen at the time which results in a high degree of error measuring the CE angle. Therefore most surgeons use conventional X-rays of the whole pelvis taken perioperatively.

Consequently, we developed a measuring device to be used under fluoroscopy:

1) CE – angle measurement device.
2) Acetabular index angle measurement device.
3) Drill guide.

This measuring device – called “The Søballe Instrument”, after its inventor Prof. Kjeld Søballe, M.D., Ph.D. – is now commercially available to the surgical community – through this web-site.