Abstract
Introduction
The deltamotion bearing system provides a large bearing even with small acetabular components. With optimally placed components the risk of dislocation is extremely low. However the acetabular component is a monobloc system and has significant technical considerations. This is an early series of patients to determine whether a monobloc system can be reliable placed in an acceptable position
Method
66 consecutive deltamotion cases were performed between 1/09/2010 and 31/12/2011. 52 cases were in primary operations and 14 were in revisions. In each case the surgical technique was modified and a trial reduction was performed using the pinnacle trial shell and liner. This enabled the surgeon to determine the optimum combined anteversion before insertion of the definitive component. In no case was a component sacrificed due to failure to achieve adequate press fit fixation. In each case the acetabular component was assessed to determine the angle of inclination and version. 32 cases had follow up of greater than 1 year and these patients were contacted telephonically and interviewed concerning adventitious noises.
Results
No patients have been revised. There have been no dislocations and no sepsis. No patients report any adventitious noises at 1 year follow up. The average angle of inclination was 40° (32–55°) and the average version was 12° (0–28°).
Discussion
The deltamotion system provides large ceramic bearings from a shell size of 44mm upwards. No other system can offer this advantage. With a small modification to the surgical technique the monobloc system can be reliably placed in an acceptable position.
ONE DISCLOSURE
