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Journal of Orthopaedics and Traumatology

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Open Access 01-09-2015 | Original Article

A prospective randomized radiographic and dual-energy X-ray absorptiometric study of migration and bone remodeling after implantation of two modern short-stemmed femoral prostheses

Authors: Volker Brinkmann, Florian Radetzki, Karl Stefan Delank, David Wohlrab, Alexander Zeh

Published in: Journal of Orthopaedics and Traumatology | Issue 3/2015

Abstract

Background

The aim of this prospective randomized study was to analyze migration and strain transmission of the Metha™ and Nanos™ femoral prostheses.

Materials and methods

Between 1 January 2011 and 2 April 2013, 50 patients were randomized to receive short-stemmed femoral prostheses. Metha™ stems were implanted in 24 patients (12 female, 12 male; mean age 58.7 years; mean body mass index [BMI] 27.4) and Nanos™ stems in 26 patients (10 female, 16 male; mean age 59.7 years; mean BMI 27.1). Longitudinal stem migration, varus−valgus alignment, changes of center of rotation (COR), femoral offset and caput-collum-diaphyseal angle, leg length discrepancy, periprosthetic radiolucent lines incidence, and dual-energy X-ray absorptiometry (DEXA) scans were analysed after an average of 98 and 381 days.

Results

There was no significant change of varus−valgus alignment or clinically relevant migration of the Metha™ or Nanos™ prostheses during postoperative follow-up. After 12.3 months, the DEXA scans showed small but significant differences of bone mineral density in Gruen zones 1 (minus ~8 %) and 6 (plus ~9 %) for the Metha™ and in Gruen zone 1 (minus ~14 %) for the Nanos™ (paired t test). Visual analog scale (VAS) and Harris Hip Score (HHS) improved significantly for both implants (Nanos™/Metha™ 12.3 months postoperatively HSS 96.5/96.2; VAS 0.7/0.8, respectively). COR or offset did not change significantly after surgery.

Conclusions

Neither implant showed signs of impaired osseointegration. DEXA demonstrated proximally located load transfer with only moderate proximal stress shielding.

Level of evidence

II.

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Title: A prospective randomized radiographic and dual-energy X-ray absorptiometric study of migration and bone remodeling after implantation of two modern short-stemmed femoral prostheses
Authors: Volker Brinkmann
Florian Radetzki
Karl Stefan Delank
David Wohlrab
Alexander Zeh
Publication date: 01-09-2015
Publisher: Springer International Publishing
Published in: Journal of Orthopaedics and Traumatology / Issue 3/2015
Print ISSN: 1590-9921
Electronic ISSN: 1590-9999
DOI: https://doi.org/10.1007/s10195-015-0335-1

Keynote webinar | Spotlight on medication adherence

Springer Medicine

A prospective randomized radiographic and dual-energy X-ray absorptiometric study of migration and bone remodeling after implantation of two modern short-stemmed femoral prostheses

Abstract

Background

Materials and methods

Results

Conclusions

Level of evidence

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Materials and methods

Results

Conclusions

Level of evidence

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