Abstract
Introduction
The current strategy for modular neck failures in total hip arthroplasty (THA) is calibrated on CrCo neck failures. Stem revision is usually required, but the procedure is challenging and achieves modest outcomes (up to 20% of re-revisions at short-term). No study reports revision strategies and outcomes after Ti neck failures. Aims of the study were to evaluate: (1) demographic and implant features of the cohort to be revised, (2) intra-operative findings and surgical revision strategies and (3) clinical and radiological post-revision outcomes.
Materials and methods
Hospital database was enquired about revisions due to Ti neck failures in primary THAs. Sixty-five revisions were enrolled (all with the same modular system). Neck exchange was attempted as the first-line treatment. Patients were clinically and radiographically evaluated after revision.
Results
The revision cohort encompassed fatigue neck fractures occurred 4.4 ± 2.6 years after THA: patients < 65 years and/or > 80 kg (98.5%) were predominant. Fifty-three neck exchanges were performed (81.5%). Eleven failures required stem revisions (16.9%), generally due to demanding neck extraction. Six complications occurred after neck exchange (11.3%), among them 2 acute infections requiring surgery (3.8%). Among stem revisions, one aseptic loosening and one neck re-fracture (18.5%) required re-revisions. At a mean follow-up of 7.1 ± 4 years, the neck exchange cohort achieved a mean HHS of 89.1 ± 6.3 (stem revisions: 84.1 ± 10.9).
Conclusions
Revisions for Ti neck failures were predominantly performed due to fatigue fractures. In case of failures, neck exchange is a feasible procedure in most of the cases, with good outcomes at 7 years.
Level of evidence
Level IV, retrospective case series.
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Data availability
The data that support the findings of this study are available from the corresponding author, upon reasonable request.
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Modula system, Adler Ortho, Milan. http://www.adlerortho.com/wp-content/uploads/2019/07/modula.pdf. Last access: 27 Mar 2021
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FC and FT concepted the design of the study. BB, SL and MC provided the data, analyzed the data and conducted the statistical analysis. FC, SL and ET wrote the manuscript. ET and FT supervised the article production and corrected the final paper. All the Authors read and approved the final version.
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Castagnini, F., Bordini, B., Lucchini, S. et al. Mid-term outcomes of revision hip arthroplasty due to titanium modular neck failure. Arch Orthop Trauma Surg 143, 5909–5918 (2023). https://doi.org/10.1007/s00402-023-04805-1
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DOI: https://doi.org/10.1007/s00402-023-04805-1