title: Long-term survivorship and complication rate comparison of a cementless modular stem and cementless fixed neck stems for primary total hip replacement.
abstract: OBJECTIVE
  Modular necks used in total hip replacement (THR) have become an increasingly discussed topic with the recent recall of multiple modular systems, but it is anticipated that outcomes for these devices are highly design-specific. The objectives of this study were to determine if the survivorship and complication rates of a specific modular femoral stem (PROFEMUR® Z, MicroPort Orthopedics Inc., Arlington, TN, USA) were significantly lower than those of all cementless fixed neck stems in an arthroplasty registry.
  
  
  METHODS
  The database of an arthroplasty registry was searched for all patients implanted with a specific modular stem and all those implanted with cementless fixed neck stems. Kaplan-Meier survivorship and complication rates were compared between the two groups.
  
  
  RESULTS
  The 12-year survivorship of the modular stem (95.8%) was not significantly less than that of all cementless fixed neck stems (96.1%). There was also no difference in revision rates for dislocation, periprosthetic fractures, aseptic loosening or septic loosening between the two groups.
  
  
  CONCLUSIONS
  The use of the specific modular stem did not adversely affect long-term component survivorship or complication rates when compared to all cementless fixed neck THRs in an arthroplasty registry.
authors.affiliation: MicroPort Orthopedics Inc, 5677 Airline Rd., Arlington, TN, 38002, USA, david.fitch@ortho.microport.com.
authors.forename: David A
authors.initials: DA
authors.lastname: Fitch
authors.forename: Cristina
authors.initials: C
authors.lastname: Ancarani
authors.forename: Barbara
authors.initials: B
authors.lastname: Bordini
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation* / Q000401:mortality; D005260:Female; D005269:Femur / Q000601:surgery*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011474:Prosthesis Design; D012042:Registries; D012086:Reoperation; D015996:Survival Rate; D016896:Treatment Outcome; D055815:Young Adult