title: Reverse total shoulder arthroplasty using a trabecular metal glenoid base plate: functional and radiological outcomes at two to five years.
abstract: OBJECTIVE
  We present the medium-term clinical results of a reverse total shoulder arthroplasty with a trabecular metal glenoid base plate.
  
  
  METHODS
  We reviewed 125 consecutive primary reverse total shoulder arthroplasties (RTSA) implanted in 124 patients for rotator cuff arthropathy. There were 100 women and 24 men in the study group with a mean age of 76 years (58 to 89). The mean follow-up was 32 months (24 to 60). No patient was lost to follow-up.
  
  
  RESULTS
  There were statistically significant improvements in the mean range of movement and Oxford Shoulder Score (p < 0.001). Kaplan-Meier survivorship at five years was 96.7% (95% confidence interval 91.5 to 98.7) with aseptic glenoid failure as the end point. Radiologically, 63 shoulders (50.4%) showed no evidence of notching, 51 (40.8%) had grade 1 notching, ten (8.0%) had grade 2 notching and one (0.8%) had grade 4 notching. Radiolucency around the glenoid base plate was found in one patient (0.8%) and around the humeral stem in five (4.0%). In all, three RTSA (2.4%) underwent revision surgery for aseptic mechanical failure of the glenoid within 11 months of surgery due to malseating of the glenosphere.
  
  
  CONCLUSIONS
  The clinical results of this large independent single unit series are comparable to those from previous series of RTSA reported in the literature. A trabecular metal base plate is safe and effective in the medium-term. Cite this article: Bone Joint J 2016;98-B:969-75.
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: K
authors.initials: K
authors.lastname: Theivendran
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: M
authors.initials: M
authors.lastname: Varghese
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: R
authors.initials: R
authors.lastname: Large
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: M
authors.initials: M
authors.lastname: Bateman
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: M
authors.initials: M
authors.lastname: Morgan
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: A
authors.initials: A
authors.lastname: Tambe
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: M
authors.initials: M
authors.lastname: Espag
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: T
authors.initials: T
authors.lastname: Cresswell
authors.affiliation: Royal Derby Hospital, Derby, Derbyshire, DE22 3NE, UK.
authors.forename: D I
authors.initials: DI
authors.lastname: Clark
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000072228:Arthroplasty, Replacement, Shoulder / Q000295:instrumentation* / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D012086:Reoperation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D000070656:Rotator Cuff Tear Arthropathy / Q000601:surgery; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D000072227:Shoulder Prosthesis
keywords: Cuff tear arthropathy; Reverse shoulder arthroplasty; Trabecular metal