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FIG. 12B illustrates that the bone attachment features 828 of the tibial resection guide 822 may be angled such that the fasteners diverge as they extend into the tibia 226. This divergence can be advantageous since it can provide a stable engagement between the resection guide 820 and the bone.  Similarly, converging bone attachment features 828 as they extend into the bone can also provide stable engagement of the bone. Alternatively, or in addition, divergence and/or convergence of one or more bone attachment features 828 can minimize the number of one or more bone attachment features 828 used for a surgical procedure.  This can save time and materials. In the illustrated embodiment, bone attachment feature 828a may be angled medially and bone attachment feature 828b may be angled laterally. In another embodiment, bone attachment feature 828a may be angled to enter the bone perpendicular to surface and bone attachment feature 828b may be angled to converge with bone attachment feature 828a (either outside or within the bone). Advantageously, a surgeon can request certain configurations and/or trajectories for the bone attachment features 828 (e.g., by way of the user instructions 604).

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