title: Traditional Versus Congruent Arc Latarjet Technique: Effect on Surface Area for Union and Bone Width Surrounding Screws.
abstract: OBJECTIVE
  To compare the surface area available for bony contact and the width of bone on each side of the Latarjet fixation screws in the traditional Latarjet technique versus the congruent arc modification of the Latarjet technique.
  
  
  METHODS
  Computed tomographic scans of 24 shoulders in patients with glenohumeral instability who underwent multiplanar reconstruction measurements with multiple dimensions of the coracoid. The surface area of the coracoid available for bony contact with the anterior glenoid and width of bone on each side of a 3.5-mm screw was compared for the traditional Latarjet technique versus the congruent arc modification.
  
  
  RESULTS
  The surface area available for bony contact to the anterior glenoid was 5.65 ± 1.08 cm2using the traditional Latarjet technique compared with 3.64 ± 0.93 cm2using the congruent arc modification of the Latarjet technique (P < .001). The mean width of bone on each side of a 3.5-mm screw was 7.1 ± 1.0 mm using the traditional Latarjet technique compared with 4.1 ± 1.0 mm using the congruent arc modification (P < .001).
  
  
  CONCLUSIONS
  The traditional Latarjet technique has greater bony contact with the glenoid and greater bone width on each side of the screws compared with the congruent arc modification of the Latarjet technique. This potentially allows for a larger surface for healing in the traditional Latarjet technique. Moreover, because of smaller width of the bone around the screw, the congruent arc modification is potentially less tolerant of screw-positioning error compared with the traditional Latarjet technique.
  
  
  METHODS
  Level III, retrospective comparative study.
authors.affiliation: University Specialty Clinics, University of South Carolina School of Medicine, Columbia, South Carolina, U.S.A.
authors.forename: Guillaume D
authors.initials: GD
authors.lastname: Dumont
authors.affiliation: Sports Medicine & Performance Center, The University of Kansas Hospital, Kansas City, Kansas, U.S.A.
authors.forename: Bryan G
authors.initials: BG
authors.lastname: Vopat
authors.affiliation: Dwight D. Eisenhower Army Medical Center, Fort Gordon, Georgia, U.S.A.
authors.forename: Stephen
authors.initials: S
authors.lastname: Parada
authors.affiliation: North Shore LIJ Orthopaedic Institute, Garden City, New York, U.S.A.
authors.forename: Randy
authors.initials: R
authors.lastname: Cohn
authors.affiliation: Watson Clinic LLP, Lakeland, Florida, U.S.A.
authors.forename: Amun
authors.initials: A
authors.lastname: Makani
authors.affiliation: Steadman Philippon Research Institute, Vail, Colorado, U.S.A.
authors.forename: George
authors.initials: G
authors.lastname: Sanchez
authors.affiliation: Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, U.S.A.
authors.forename: Petar
authors.initials: P
authors.lastname: Golijanin
authors.affiliation: Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, U.S.A.
authors.forename: Brendin R
authors.initials: BR
authors.lastname: Beaulieu-Jones
authors.affiliation: Jackson Memorial Hospital, Miami, Florida, U.S.A.
authors.forename: Anthony
authors.initials: A
authors.lastname: Sanchez
authors.affiliation: The Steadman Clinic, Vail, Colorado, U.S.A.. Electronic address: mprovencher@thesteadmanclinic.com.
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Provencher
mesh_terms: D000293:Adolescent; D000328:Adult; D001863:Bone Screws; D005260:Female; D061165:Glenoid Cavity / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000601:surgery; D008297:Male; D056888:Patient Positioning; D012189:Retrospective Studies; D012540:Scapula / Q000000981:diagnostic imaging / Q000601:surgery; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D055815:Young Adult