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The Walch classification [30] shows the morphologic features of the glenoid in primary glenohumeral arthritis. Reprinted from Karelse A, Leuridan S, Van Tongel A, Debeer P, Van Der Sloten J, Denis K, De Wilde LF. Consequences of reaming with flat and convex reamers for bone volume and surface area of the glenoid; a basic science study. J Orthop Surg Res. 2015;10:181. (http://creativecommons.org/licenses/by/4.0/).
