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Clinical and radiographic evaluation of total hip arthroplasties using porous tantalum modular acetabular components: 5-year follow-up of clinical trial

  • Original Article
  • Published:
Modern Rheumatology

Abstract

Objectives

Porous tantalum is a biomaterial newly applied for artificial joints. We present here 5-years follow-up report of a multicenter clinical trial of total hip arthroplasties (THA) with porous tantalum modular acetabular component (modular PTC).

Methods

Study participants received 82 hips in 79 cases, with 61.2 months follow-up on average. Age at operation was 60.9 years. Clinical results were evaluated using Merle d’Aubigne Postel score. Presence of implant loosening, periacetabular radiolucency, osteolysis, and gap filling were examined for radiographic results.

Results

Merle d’Aubigne Postel score improved from 10.0 to 16.4 points. All PTC were radiographically stable, with no evidence of progressive radiolucencies. Average polyethylene wear rate was 0.004 mm/year, with no periacetabular osteolysis. Fifteen hips (18.3%) showed a gap >1 mm; however, all showed bone filling within 12 months. PTC with oversized reaming was significantly less likely to have a gap. No implant failure was noted related to modularity. Resulting survival rate of modular PTC was 100% at 5 years.

Conclusions

Modular PTC showed excellent results at 5-years of follow-up. Some hips showed periacetabular gaps, which were filled with bone within 1 year. Further follow-up was needed to determine long-term efficacy.

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Conflict of interest

Y. N. received lecture fees from Zimmer. All other authors have declared no conflicts of interest.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Kyushu University, 1-3-3 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan

    Yasuharu Nakashima, Takuaki Yamamoto, Taro Mawatari, Goro Motomura, Masanobu Ohishi, Toshio Doi, Masayuki Kanazawa & Yukihide Iwamoto

  2. Department of Bone and Joint Surgery, Ehime University, Shizugawa, Toon, 791-0295, Japan

    Naohiko Mashima & Hiroshi Imai

  3. Department of Orthopaedic Surgery, Yokohama City University Medical Center, 4-57 Urafune, Minamiku, Yokohama, 232-0024, Japan

    Naoto Mitsugi, Naoya Taki & Yuichi Mochida

  4. Department of Orthopedic Surgery, University of the Ryukyu, 207 Uehara, Nishihara, 903-0215, Japan

    Ichiro Owan & Kaoru Arakaki

Authors
  1. Yasuharu Nakashima
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  2. Naohiko Mashima
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  3. Hiroshi Imai
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  4. Naoto Mitsugi
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  14. Masayuki Kanazawa
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  15. Yukihide Iwamoto
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Correspondence to Yasuharu Nakashima.

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Nakashima, Y., Mashima, N., Imai, H. et al. Clinical and radiographic evaluation of total hip arthroplasties using porous tantalum modular acetabular components: 5-year follow-up of clinical trial. Mod Rheumatol 23, 112–118 (2013). https://doi.org/10.1007/s10165-012-0618-9

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  • DOI: https://doi.org/10.1007/s10165-012-0618-9

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