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

Yasuharu Nakashima, Naohiko Mashima, Hiroshi Imai, Naoto Mitsugi, Naoya Taki, Yuichi Mochida, Ichiro Owan, Kaoru Arakaki, Takuaki Yamamoto, Taro Mawatari, Goro Motomura, Masanobu Ohishi, Toshio Doi, Masayuki Kanazawa, Yukihide Iwamoto

Research output: Contribution to journalArticle

23 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalModern Rheumatology
Issue number1
Publication statusPublished - Jan 1 2013


All Science Journal Classification (ASJC) codes

  • Rheumatology

Cite this