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BMC Musculoskeletal Disorders

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Open Access 01-12-2019 | Hip-TEP | Research article

Migration analysis of a metaphyseal-anchored short femoral stem in cementless THA and factors affecting the stem subsidence

Authors: Michael O. Schaer, Michael Finsterwald, Iris Holweg, Dimitris Dimitriou, Alexander Antoniadis, Naeder Helmy

Published in: BMC Musculoskeletal Disorders | Issue 1/2019

Abstract

Background

Early femoral stem subsidence following a cementless THA is correlated with aseptic loosening of the femoral component. The short femoral stems allow bone sparing and implantation through a minimally invasive approach; however, due to their metaphyseal anchoring, they might demonstrate different subsidence pattern than the conventional stems.

Methods

In this prospective single-center study, a total of 68 consecutive patients with an average age of 63 years, and a minimum follow-up of 5 years following a cementless THA with a metaphyseal-anchored short femoral stem were included. The femoral stem subsidence was evaluated using “Ein Bild Roentgen Analyse” (EBRA).

Results

Average stem migration was 0.96 +/− 0.76 mm at 3 months, 1.71 +/− 1.26 mm at 24 months, and 2.04+/− 1.42 mm at last follow-up 60 months postoperative. The only factor that affected migration was a stem size of 6 or more (r² = 5.74; p = 0.039). Subdivision analysis revealed, that only in females migration appeared to be affected by stem size irrespective of weight but not in men (female stem size of 6 or more vs. less (Difference = − 1.48 mm, R² = 37.5; p = 0.001). Migration did not have an impact on clinical outcome measures.

Conclusions

The examined metaphyseal-anchored short femoral stem showed the highest subsidence within the first 3 months postoperative, the implant began to stabilize at about 24 months but continued to slowly migrate with average total subsidence of 2.04 mm at 5 years following the THA. The amount of stem subsidence was not associated with worse clinical outcomes such as HHS, patient satisfaction, or pain.

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Title: Migration analysis of a metaphyseal-anchored short femoral stem in cementless THA and factors affecting the stem subsidence
Authors: Michael O. Schaer
Michael Finsterwald
Iris Holweg
Dimitris Dimitriou
Alexander Antoniadis
Naeder Helmy
Publication date: 01-12-2019
Publisher: BioMed Central
Keywords: Hip-TEP
Hip-TEP
Published in: BMC Musculoskeletal Disorders / Issue 1/2019
Electronic ISSN: 1471-2474
DOI: https://doi.org/10.1186/s12891-019-2980-7

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Migration analysis of a metaphyseal-anchored short femoral stem in cementless THA and factors affecting the stem subsidence

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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