TY - JOUR
T1 - Optimal rotation and screw positioning for initial glenosphere baseplate fixation in reverse shoulder arthroplasty
AU - Parsons, Bradford O.
AU - Gruson, Konrad I.
AU - Accousti, Kenneth J.
AU - Klug, Raymond A.
AU - Flatow, Evan L.
N1 - Copyright:
Copyright 2010 Elsevier B.V., All rights reserved.
PY - 2009/11
Y1 - 2009/11
N2 - Hypothesis: Critical to the longevity of the reverse shoulder arthroplasty is initial rigid fixation of the glenosphere, determined in part by baseplate screw fixation. We studied screw fixation in baseplates placed in several different orientations. Methods: Twelve, lightly-embalmed adult scapulae were implanted using a variable-angle and a fixed-angle baseplate. Baseplates were placed in three rotational positions: 1) 12/6 o'clock, 2) 20° rotation toward the coracoid, and 3) 20° rotation toward the scapular spine. Results: Superiorly, perpendicular screws for the variable-angle baseplate in the 12 o'clock (39.7 mm) and coracoid (37.7 mm) position and angled screws in the coracoid position (37.5 mm) were found to be the longest. Inferiorly, screws holes made perpendicular to the baseplate yielded the longest screw lengths (37.4 mm), while inferiorly angled screws were shorter, especially in the anterior-inferior glenoid (16.8 mm). Conclusions: Overall, baseplate rotation toward the spine yielded the lowest mean screw lengths. Proper initial rotation of the baseplate and screw orientation can optimize initial fixation of the glenosphere in reverse shoulder arthroplasty. Level of evidence: Level IV, Case Series, Treatment Study.
AB - Hypothesis: Critical to the longevity of the reverse shoulder arthroplasty is initial rigid fixation of the glenosphere, determined in part by baseplate screw fixation. We studied screw fixation in baseplates placed in several different orientations. Methods: Twelve, lightly-embalmed adult scapulae were implanted using a variable-angle and a fixed-angle baseplate. Baseplates were placed in three rotational positions: 1) 12/6 o'clock, 2) 20° rotation toward the coracoid, and 3) 20° rotation toward the scapular spine. Results: Superiorly, perpendicular screws for the variable-angle baseplate in the 12 o'clock (39.7 mm) and coracoid (37.7 mm) position and angled screws in the coracoid position (37.5 mm) were found to be the longest. Inferiorly, screws holes made perpendicular to the baseplate yielded the longest screw lengths (37.4 mm), while inferiorly angled screws were shorter, especially in the anterior-inferior glenoid (16.8 mm). Conclusions: Overall, baseplate rotation toward the spine yielded the lowest mean screw lengths. Proper initial rotation of the baseplate and screw orientation can optimize initial fixation of the glenosphere in reverse shoulder arthroplasty. Level of evidence: Level IV, Case Series, Treatment Study.
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U2 - 10.1016/j.jse.2008.11.002
DO - 10.1016/j.jse.2008.11.002
M3 - Article
C2 - 19208487
AN - SCOPUS:70349824092
SN - 1058-2746
VL - 18
SP - 886
EP - 891
JO - Journal of Shoulder and Elbow Surgery
JF - Journal of Shoulder and Elbow Surgery
IS - 6
ER -