title: [Survival of the T28 femoral stem. Comparison of polished versus roughed-surface finish].
abstract: BACKGROUND
  Femoral stem loosening in total hip arthroplasty has a multifactorial etiology. T28 femoral stems have been made both roughed and polished-finish types, and differences in design are of interest in their effect on survival.
  
  
  METHODS
  One hundred and sixty-seven stems (84 polished and 83 roughed-finish) placed between 1975 and 1982 were evaluated. Gruen zones were used to determine loosening and survival was determined by the Kaplan-Meier method.
  
  
  RESULTS
  Revision was made in 24.8% of the cases. Twenty-year survival rates were of 85.2% for roughed-finish stems and of 64.2% for polished-finish stems.
  
  
  CONCLUSIONS
  We were able to confirm our hypothesis concerning the longer survival rate of the roughed-finish implant which was of 87.95% at 17 years of follow-up. The survival-time of the implant was independent of diagnosis, cementation, age and positioning. The survival-time of the T28 cemented implant does not only depend on its texture but it has a multifactorial origin.
authors.affiliation: Clínica de Rodilla, Instituto Nacional de Rehabilitación, Calzada México Xochimilco Núm. 289. Col. Arenal de Guadalupe, Delegación Tlalpan, CP 14389, DF México. pchaidez2001@yahoo.com
authors.forename: Pedro
authors.initials: P
authors.lastname: Chaidez Rosales
authors.forename: Alastair
authors.initials: A
authors.lastname: Younger
authors.forename: Saúl
authors.initials: S
authors.lastname: Renán León
authors.forename: Robert
authors.initials: R
authors.lastname: Poss
mesh_terms: D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012189:Retrospective Studies; D013997:Time Factors