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Survivorship of Monoblock Trabecular Metal Cups in Primary THA

Midterm Results

  • Original Article
  • Published:
Clinical Orthopaedics and Related Research

Abstract

Monoblock trabecular metal cups are made of a novel porous material intended to enhance ingrowth and improve fixation. We prospectively followed 223 consecutive patients with 245 trabecular metal acetabular cups implanted during primary total hip arthroplasties to determine the overall survivorship of the implant, and any association of survivorship to primary diagnosis and age, and to determine the fate of polar gaps and cysts. Minimum followup was 36 months (mean, 60 months; range, 36–112 months). Patients were assessed with the Harris Hip score and the Oxford questionnaire and radiographically with standardized serial radiographs. At last followup, all cups were radiographically stable with no evidence of migration or progressive radiolucencies. The survivorship with reoperation as the end point was estimated at 98.75% with a 95% confidence interval. Three reoperations occurred during the first 36 months. The Harris hip score increased from 48 to 94 and the Oxford score was 16.4 at the last examination. We observed no difference in terms of survivorship among patients with osteoarthritis, osteonecrosis, or hip dysplasia. Seven of 14 (50%) osteoarthritis cysts and 10 of 33 (33.3%) polar gaps detected on postoperative radiographs decreased or filled, whereas none of the remainder deteriorated with time. Our midterm results suggest this implant may enhance fixation, but long-term followup is needed to confirm our findings.

Level of Evidence: Level IV Therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

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Acknowledgments

We thank Sokratis Varitimidis, MD, for radiographic evaluation in this series and Dr V. Bagiatis for statistical analysis of our data.

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Authors and Affiliations

  1. Orthopaedic Department, University of Thessalia, Larissa, Greece

    Konstantinos N. Malizos MD, Konstantinos Bargiotas MD, Loukia Papatheodorou MD, Michael Hantes MD & Theofilos Karachalios MD

  2. Orthopaedic Department, University Hospital of Larissa, Larissa, Greece

    Konstantinos Bargiotas MD

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  1. Konstantinos N. Malizos MD
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  2. Konstantinos Bargiotas MD
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  3. Loukia Papatheodorou MD
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  4. Michael Hantes MD
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  5. Theofilos Karachalios MD
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Correspondence to Konstantinos Bargiotas MD.

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Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.

Each author certifies that his or her institution has approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent was obtained.

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Malizos, K.N., Bargiotas, K., Papatheodorou, L. et al. Survivorship of Monoblock Trabecular Metal Cups in Primary THA. Clin Orthop Relat Res 466, 159–166 (2008). https://doi.org/10.1007/s11999-007-0008-3

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  • DOI: https://doi.org/10.1007/s11999-007-0008-3

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