title: Bone presence between the central peg's radial fins of a partially cemented pegged all poly glenoid component suggest few radiolucencies.
abstract: BACKGROUND
  Cement penetration problems and/or cement-induced bone necrosis may contribute to glenoid component failures. An all polyethylene component was developed that promotes biologic fixation between radial fins of its central peg and utilizes minimal cement fixation for its peripheral pegs, but it has little published data. We hypothesized better bone presence between the radial fins would be associated with less overall radiolucencies. This study's purpose was to utilize computed tomography (CT) and plain films to assess for bone between the central peg's radial fins and to assess overall component radiolucencies.
  
  
  METHODS
  Thirty-five of 48 consecutively performed total shoulder arthroplasties (TSA) for primary glenohumeral osteoarthritis were in patients able to participate a minimum 2 years after surgery. All had reamed humeral head bone packed between radial fins of the central peg and minimal cement for the peripheral pegs. Thin cut (0.625 mm) CT scans, standardized plain films, Simple Shoulder Tests (SST), and Constant scores were obtained. A musculoskeletal radiologist calculated Yian CT scores, bone presence between fins on CT, and Lazarus radiolucency scores.
  
  
  RESULTS
  At a mean of 43 months, by CT: 1) better Yian scores correlated with more bone between fins, and 2) bone was present in 6/6 inter-fin compartments in 23/35 shoulders, averaging 4.5/6 overall. Mean Lazarus radiolucency score was 0.45. Mean SST and Constant scores were 10.3 and 81.3, respectively.
  
  
  CONCLUSIONS
  TSA utilizing autologous bone in inter-fin compartments of the central peg and minimal peripheral peg cement maintained bone presence a minimum 2 years post-op. More bone imparted fewer overall component radiolucencies.
authors.affiliation: Department of Orthopaedic Surgery and Rehabilitation, University of Nebraska Medical Center, Omaha, NE 68198-1080, USA. ryanarnoldmd@yahoo.com
authors.forename: Ryan M
authors.initials: RM
authors.lastname: Arnold
authors.forename: Robin R
authors.initials: RR
authors.lastname: High
authors.forename: Kevin T
authors.initials: KT
authors.lastname: Grosshans
authors.forename: Craig W
authors.initials: CW
authors.lastname: Walker
authors.forename: Edward V
authors.initials: EV
authors.lastname: Fehringer
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019643:Arthroplasty, Replacement; D001843:Bone Cements; D002484:Cementation; D006801:Humans; D058430:Humeral Head / Q000000981:diagnostic imaging / Q000601:surgery*; D007595:Joint Prosthesis; D008875:Middle Aged; D016348:Osseointegration; D010003:Osteoarthritis / Q000601:surgery*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012540:Scapula / Q000000981:diagnostic imaging* / Q000601:surgery
chemical_list: D001843:Bone Cements