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Research

OBJECTIVE OUTCOME USING GAIT ANALYSIS OF CEMENTLESS TOTAL HIP ARTHROPLASTY WITH A CEMENTLESS DUAL MOBILITY CUP: A RETROSPECTIVE STUDY AT A MEAN FOLLOW-UP OF FIVE YEARS

8th Combined Meeting Of Orthopaedic Research Societies (CORS)



Abstract

Summary Statment

The dual-mobility cup seems to bring more stability without changing the gait pattern.

Introduction

Dislocations and instability are among the worst complications after THA in elderly patient. Dual mobility cups seem to lower these risks. To our knowledge no study performed a gait analysis of dual cup in this group.

Methods

Our team implanted 52 dual mobility cups (Gyros, de Puy J&J Corporation) before 2007. 7 hip revisions and 15 primary hips were reviewed in 20 patients. The mean age at the review was 79.8 years old. 15 died or were mentally too disabled to perform a gait analysis. 5 didn't give consent for a clinical study and 8 were not localizable. We performed a gait analysis using a non-invasive miniature sensors device (PhysilogTM) when patients walked freely on a flat ground. We compared our results to a control group of frail eldery patients of the same age who didn't sufferd of orthopedic condition and to a group of patient with a conventional THA from our institution and to the literature. The WOMAC and Harris Hip scores were also computed.

Results

None of the 22 hips faced dislocation. The gait analysis showed good results that were superior to those of the control group of frail elderly and comparable to those of conventional THA. The cadence was of 100,3 steps/min, the double stance of 23,3%, the stance of 61,6%, the stride of 1,13 meters and the walking speed of 0,96 m/s. The mean HHS and WOMAC were 87,6 (51–100) and 11,3 (0–34).

Conclusion

Our results at 5 years compared favorably with the current litterature. The increase of stability didn't impared the walking performances.