title: Clinical and radiographic evaluation of total hip arthroplasties using porous tantalum modular acetabular components: 5-year follow-up of clinical trial.
abstract: OBJECTIVE
  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.
authors.affiliation: Department of Orthopaedic Surgery, Kyushu University, 1-3-3 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan. yasunaka@ortho.med.kyushu-u.ac.jp
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Naohiko
authors.initials: N
authors.lastname: Mashima
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Imai
authors.forename: Naoto
authors.initials: N
authors.lastname: Mitsugi
authors.forename: Naoya
authors.initials: N
authors.lastname: Taki
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Mochida
authors.forename: Ichiro
authors.initials: I
authors.lastname: Owan
authors.forename: Kaoru
authors.initials: K
authors.lastname: Arakaki
authors.forename: Takuaki
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Taro
authors.initials: T
authors.lastname: Mawatari
authors.forename: Goro
authors.initials: G
authors.lastname: Motomura
authors.forename: Masanobu
authors.initials: M
authors.lastname: Ohishi
authors.forename: Toshio
authors.initials: T
authors.lastname: Doi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Kanazawa
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002484:Cementation; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D015207:Osteoarthritis, Hip / Q000601:surgery; D010020:Osteonecrosis / Q000601:surgery; D016062:Porosity; D011474:Prosthesis Design; D011475:Prosthesis Failure / Q000209:etiology; D011859:Radiography; D016059:Range of Motion, Articular; D020127:Recovery of Function; D012720:Severity of Illness Index; D015996:Survival Rate; D013635:Tantalum / Q000009:adverse effects; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D013635:Tantalum