The ornamental design for an osteotomyguidetalus, as shown and described.
FIG. 1 shows a front perspective view of the osteotomy guide talus;
FIG. 2 shows a front elevation view of the osteotomy guide talus;
FIG. 3 shows a rear elevation view of the osteotomy guide talus;
FIG. 4 shows a left elevation view of the osteotomy guide talus;
FIG. 5 shows a right elevation view of the osteotomy guide talus; and,
FIG. 6 shows a top plan view of the osteotomy guide talus.
The broken lines shown in the views are included for the purpose of illustrating portions of the osteotomy guide talus that form no part of the claimed design.