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Archives of Orthopaedic and Trauma Surgery

Published in:

01-09-2014 | Trauma Surgery

Uni- and bipolar hemiarthroplasty with a modern cemented femoral component provides elderly patients with displaced femoral neck fractures with equal functional outcome and survivorship at medium-term follow-up

Authors: Kari Kanto, Raine Sihvonen, Antti Eskelinen, Minna Laitinen

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 9/2014

Abstract

Introduction

The choice between unipolar and bipolar hemiarthroplasty for treatment of displaced intracapsular femoral neck fractures in elderly patients still remains controversial. Our objective was to compare series of elderly individuals with a displaced femoral neck fracture treated with either a cemented, modular unipolar or bipolar prosthesis with the same femoral component.

Materials and methods

A prospective, randomized controlled trial of 175 displaced intracapsular femoral neck fractures in patients over 65 years was randomly allocated to unipolar (88) and to bipolar (87) hemiarthroplasty group. The primary end point was implant survival. Secondary end points included difference in ambulatory ability and mortality. Follow-up evaluations were performed at 2 months, at 1, 3 and 5 years. Implant and patient survival were followed until 2/2012. Survival analyses were performed using Kaplan–Meier curves with log-rank test. Data were analyzed using Chi-square test and Student’s t test.

Results

Unipolar hemiarthroplasty group had a significantly higher dislocation rate when compared with bipolar hemiarthroplasty group. This did not translate into difference in revision rates at 8 years. Prosthetic survival ship was 0.98 (95 % Cl 0.94–1.00) in the unipolar group and 0.97 (95 % Cl 0.93–1.00) in the bipolar group. There were no statistically significant differences in ambulatory ability, possibility to return home mortality or early radiological acetabular erosion. There were significantly more one-time dislocations in the unipolar group, but there was no difference in incidence of revisions due to recurrent dislocations. The overall mortality rate was 6 % at 30 days, 9 % at 90 days, 16 % at 12 months, and 53 % at 5 years. There was no difference in mortality between the groups.

Conclusions

Unipolar hemiarthroplasty group had a significantly higher dislocation rate when compared with bipolar hemiarthroplasty group. However, both provide elderly patients with equal ambulatory ability and low revision rate at medium-term follow-up.

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Title: Uni- and bipolar hemiarthroplasty with a modern cemented femoral component provides elderly patients with displaced femoral neck fractures with equal functional outcome and survivorship at medium-term follow-up
Authors: Kari Kanto
Raine Sihvonen
Antti Eskelinen
Minna Laitinen
Publication date: 01-09-2014
Publisher: Springer Berlin Heidelberg
Published in: Archives of Orthopaedic and Trauma Surgery / Issue 9/2014
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-014-2053-1

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Uni- and bipolar hemiarthroplasty with a modern cemented femoral component provides elderly patients with displaced femoral neck fractures with equal functional outcome and survivorship at medium-term follow-up

Abstract

Introduction

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Introduction

Materials and methods

Results

Conclusions

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