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Preliminary outcomes of the cementless UNITED hip system for primary total hip arthroplasty at a minimum 2-year follow-up

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European Journal of Orthopaedic Surgery & Traumatology Aims and scope Submit manuscript

Abstract

Introduction

This study aimed to report the initial results of the cementless UNITED hip system in primary total hip arthroplasty (THA) with a minimum follow-up of 2 years.

Methods

We retrospectively studied a consecutive series of 203 cementless THAs in 180 patients operated between 2015–2017. We included 89 female and 91 male patients with a mean age of 67 (28 to 89) years. The mean follow-up was 40 (29 to 62) months. Clinical outcome scores and radiographs were measured. Survival was calculated defining failure as the need for any further femoral or acetabular revision, irrespective of the reason.

Results

No femoral component loosening was detected. One patient had a Vancouver-B1 intraoperative periprosthetic femoral fracture treated with implant retention and cerclage wires. Two acetabular components were revised for aseptic loosening. Three patients suffered an acute infection treated with debridement, antibiotics, and implant retention. The mean Merle d'Aubigné et Postel scores improved from 13 (4 to 16) points preoperatively to 17 (12 to 18) points at the latest follow-up (p < 0.001). At a mean time of 40 months of follow-up, the survival was 99% and 100% for the acetabular and the femoral components, respectively.

Conclusion

This cementless design showed excellent preliminary outcomes in terms of fixation and patient satisfaction, comparable to that of other well-known similar systems.

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Availability of data and materials

Not applicable.

Code availability

All analyses were performed using Stata 13™ statistical software (StataCorp, College Station, TX).

Abbreviations

THA:

Total hip arthroplasty

HA:

Hydroxyapatite

ASA:

The American Society of Anaesthesiologists

MDA:

Merle D'Aubigné score

VAS:

Visual analogue scale

AP:

Anteroposterior

L:

Lateral

OR:

Odds ratios

CI:

Confidence intervals

EBRA-FCA:

Ein Bild Roentgen Analyse-femoral component analysis

PFF:

Periprosthetic femoral fractures

PTC:

Porous titanium-coated

PS:

Plasma-sprayed

IPI:

Iliopsoas impingement

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Acknowledgements

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design, and read and approved the final manuscript. Conceptualization: Martin Buttaro. Data curation: Fernando Diaz Dilernia, Agustin Garcia-Mansilla, Agustin Albani-Forneris. Methodology: Fernando Diaz Dilernia. Formal analysis and investigation: Fernando Diaz Dilernia, Pablo Slullitel. Writing—original draft preparation: Fernando Diaz Dilernia, Agustin Garcia-Mansilla, Agustin Albani-Forneris. Writing—review and editing: Fernando Diaz Dilernia, Pablo Slullitel. Resources: Gerardo Zanotti, Fernando Comba, Francisco Piccaluga. Project administration: Gerardo Zanotti, Fernando Comba, Francisco Piccaluga. Supervision: Martin Buttaro.

Corresponding author

Correspondence to Fernando Díaz-Dilernia.

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The authors declare that they have no conflict of interest.

Ethics approval

All procedures performed involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the institution's Research Ethics Board (November 25th 2019/No. 5179).

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Informed consent was obtained from all individual participants included in the study.

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Patients signed informed consent regarding publishing their data and images.

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Díaz-Dilernia, F., García-Mansilla, A.M., Albani-Forneris, A. et al. Preliminary outcomes of the cementless UNITED hip system for primary total hip arthroplasty at a minimum 2-year follow-up. Eur J Orthop Surg Traumatol 32, 745–752 (2022). https://doi.org/10.1007/s00590-021-03038-5

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