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12-10-2022 | Hip Dysplasia | Original Paper

Outcome of the Wagner Cone femoral component for difficult anatomical conditions during total hip arthroplasty

Authors: Kevin Lawson, Katherine L. Hwang, Spencer Montgomery, Derek F. Amanatullah, James I. Huddleston III, William J. Maloney, Stuart B. Goodman

Published in: International Orthopaedics | Issue 1/2023

Abstract

Purpose

Total hip arthroplasty (THA) in patients with small or unusual proximal femoral anatomy is challenging due to sizing issues, control of version, and implant fixation. The Wagner Cone is a monoblock, fluted, tapered stem with successful outcomes for these patients; however, there is limited information on subsidence, a common finding with cementless stems.

Methods

We retrospectively reviewed our cases using the modified Wagner Cone (Zimmer, Warsaw, IN) implanted over a 13-year period (2006–2019) in patients with small or abnormal proximal femoral anatomy. We performed 144 primary THAs in 114 patients using this prosthesis. Mean follow-up was 4.5 ± 3.4 years (range, 1–13 years). Common reasons for implantation were hip dysplasia (52%) and osteoarthritis in patients with small femoral proportions (22%). Analysis of outcomes included assessment of stem subsidence and stability.

Results

Survival was 98.6% in aseptic cases; revision-free survival was 97.9%. Femoral subsidence occurred in 84 cases (58%). No subsidence progressed after 3 months. Of those that subsided, the mean distance was 2.8 ± 2.0 mm. There was less subsidence in stems that stabilized prior to six weeks (2.2 ± 1.4 mm) compared to those that continued until 12 weeks (3.9 ± 1.6, p = 0.02). Harris Hip, UCLA, and WOMAC scores significantly improved from pre-operative evaluation (p < 0.001*, p < 0.003*, p ≪ 0.001*); there was no difference in outcome between patients with and without subsidence (p = 0.430, p = 0.228, p = 0.147).

Conclusion

The modified Wagner Cone demonstrates excellent clinical outcomes in patients with challenging proximal femoral anatomy. Subsidence is minor, stops by 3 months, and does not compromise clinical outcome.

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Title: Outcome of the Wagner Cone femoral component for difficult anatomical conditions during total hip arthroplasty
Authors: Kevin Lawson
Katherine L. Hwang
Spencer Montgomery
Derek F. Amanatullah
James I. Huddleston III
William J. Maloney
Stuart B. Goodman
Publication date: 12-10-2022
Publisher: Springer Berlin Heidelberg
Keywords: Hip Dysplasia
Hip-TEP
Hip-TEP
Published in: International Orthopaedics / Issue 1/2023
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-022-05608-6

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Outcome of the Wagner Cone femoral component for difficult anatomical conditions during total hip arthroplasty

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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