title: A ten-year radiologic comparison of two-all polyethylene glenoid component designs: a prospective trial.
abstract: BACKGROUND
  Aseptic glenoid component loosening remains a common problem in total shoulder arthroplasty (TSA). This study presents long-term prospective follow-up of 2 cemented all-polyethylene glenoid components with different backside design geometry and the effect on the presence and progression of radiolucent lines (RLLs).
  
  
  METHODS
  Fifty-six TSAs were performed for primary osteoarthritis. Two surgeons used an identical technique to implant 32 flat-back and 24 convex-back glenoids. In particular, the glenoid components were cemented after a minimal reaming and bone compaction. Standardized postoperative radiologic and clinical follow-up was at 2 and 10 years. Three independent observers evaluated the x-ray images for RLLs around the base plate and keel. The results were analyzed for progression and influencing factors.
  
  
  RESULTS
  At 10 years, progression of RLL was seen in both components, but there was no difference between the 2 glenoid designs (P = .16). Younger patient age (P = .03), hand dominance (P = .017), and presence of early RLLs (P = .018) were significant factors for progression of RLLs. Constant scores deteriorated with progression of RLLs (P = .006). The glenoid revision rate at 10 years was 5%.
  
  
  CONCLUSIONS
  At 10 years there was no difference in the presence or progression of RRLs between a flat-back and a convex-back glenoid all-polyethylene design. Young age, hand dominance, and poor implantation technique influence glenoid RLLs and affect the clinical result of TSA.
authors.affiliation: Centre Hospitalier Privé Saint Grégoire, Saint Grégoire, Rennes, France. collin.ph@wanadoo.fr
authors.forename: Philippe
authors.initials: P
authors.lastname: Collin
authors.forename: Aaron K L
authors.initials: AK
authors.lastname: Tay
authors.forename: Barbara
authors.initials: B
authors.lastname: Melis
authors.forename: Pascal
authors.initials: P
authors.lastname: Boileau
authors.forename: Gilles
authors.initials: G
authors.lastname: Walch
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019643:Arthroplasty, Replacement / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007595:Joint Prosthesis; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000601:surgery; D020959:Polyethylene; D011446:Prospective Studies; D011474:Prosthesis Design; D011859:Radiography; D012785:Shoulder Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D020959:Polyethylene