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. 2018 Feb 27;5:5. doi: 10.1186/s40634-018-0121-0

Fig. 1.

Fig. 1

Left shoulder, anterior on the right and posterior on the left, scope from antero-superior portal, hook guide from posterior portal. The Hook guide is parallel to the glenoid surface (a) and in the center of bone defect (b) (HH: humeral head, GL: glenoid)