  Preoperative templating in Total Hip Replacement (THR) is a method to
estimate the optimal size and position of the implant. Today, observational
(manual) size recognition techniques are still used to find a suitable implant
for the patient. Therefore, a digital and automated technique should be
developed so that the implant size recognition process can be effectively
implemented. For this purpose, we have introduced the new technique for
acetabular implant size recognition in THR preoperative planning based on the
diameter of acetabulum size. This technique enables the surgeon to recognise a
digital acetabular implant size automatically. Ten randomly selected X-rays of
unidentified patients were used to test the accuracy and utility of an
automated implant size recognition technique. Based on the testing result, the
new technique yielded very close results to those obtained by the observational
method in nine studies (90%).
