Device for accurately siting the acetabular component during total hip replacement

Introduction. In this paper we describe a device which allows consistent acetabular cup placement to reduce post-arthroplasty dislocation.

Patients and methods. The development of this surgical appliance is traced from the initial concept to the construction of a device suitable for clinical trials. The system of use is explained. The constraints imposed by the working environment and the methods employed to meet the demands imposed by surgical practice are elucidated. A clinical trial is described in which the device was used to assist in siting acetabular cup placement in ten patients.

Results. The accuracy of the ten cup placements done using the device was then compared by radiography with the accuracy of placement of 17 acetabular cups performed in the standard manner. Comparison of the results show a positive benefit arising from using the device.

Conclusions. Our initial good results on cup positioning in laboratory studies are maintained in a clinical setting, but further modifications could lend to even better results.