title: The Neviaser portal for superior glenoid anchor insertion: an anatomic study.
abstract: OBJECTIVE
  To measure the angular relationship between the Neviaser portal and the superior glenoid labrum in 60 cadaveric specimens to determine whether this portal can be used for reliable anchor placement.
  
  
  METHODS
  The Neviaser portal of 30 left and 30 right unpaired dry cadaveric scapulae with clavicles were measured by a single observer using an analogue vernier caliper. The angular relationship between the Neviaser portal and the 12 o'clock position of the glenoid labrum was calculated.
  
  
  RESULTS
  13 of the 60 scapulae were excluded from analysis, because the Neviaser portal was medial to the glenoid rim making safe anchor insertion unfeasible. For the remaining 47 scapulae, the mean angles α and β were 58.2º and 57.9º, respectively. Compared with the ideal angles α and β of 30º and 0º, respectively, all the 47 Neviaser portals were more posterior (relative to the 12 o'clock position) and closer to the transverse plane, making insertion of suture anchors in the optimum position unfeasible, except for one that was within 10º of the ideal angles in both planes.
  
  
  CONCLUSIONS
  Reliable insertion of suture anchors at the 12 o'clock position of the glenoid labrum through the Neviaser portal is unfeasible in most patients.
authors.affiliation: Trauma and Orthopaedics, Yorkshire and the Humber Deanery, United Kingdom.
authors.forename: Benjamin Alexander
authors.initials: BA
authors.lastname: Haughton
authors.affiliation: Department of Experimental Psychology, Faculty of Psychology, Complutense University of Madrid, Spain.
authors.forename: Ignacio
authors.initials: I
authors.lastname: Serrano-Pedraza
authors.affiliation: Nil.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Boada
authors.affiliation: Wansbeck General Hospital, Northumbria Healthcare NHS Foundation Trust, United Kingdom.
authors.forename: Jaime Jose
authors.initials: JJ
authors.lastname: Candal-Couto
mesh_terms: D001182:Arthroscopy; D002102:Cadaver; D002968:Clavicle / Q000473:pathology / Q000601:surgery; D061165:Glenoid Cavity / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D053441:Suture Anchors
keywords: arthroscopy; glenoid cavity; scapula; shoulder joint; suture anchors