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

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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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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Stanford University, 450 Broadway Street, M/C 6342, Redwood City, CA, 94063-6342, USA

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

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  1. Kevin Lawson
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  2. Katherine L. Hwang
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  3. Spencer Montgomery
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  4. Derek F. Amanatullah
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  6. William J. Maloney
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  7. Stuart B. Goodman
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Contributions

K. L., K. W., and S. B. G. conceived and planned the study. K. L. and K. W. gathered all the data. All authors reviewed the data and participated in writing and reviewing the manuscript.

Corresponding author

Correspondence to Stuart B. Goodman.

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Ethics approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Human Subjects Institutional Review Board of Stanford University (August 24, 2021, eProtocol 10669).

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

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No patient radiographs or other specific identifying data are included in this study.

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The authors declare no competing interests.

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Lawson, K., Hwang, K.L., Montgomery, S. et al. Outcome of the Wagner Cone femoral component for difficult anatomical conditions during total hip arthroplasty. International Orthopaedics (SICOT) 47, 117–124 (2023). https://doi.org/10.1007/s00264-022-05608-6

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