Figure 4.

Process of device trialling using a dynamic biomodel (A,B,C,D,E) and the resulting fit of the device in the C6–C7 interbody space (F). The device inserter can be used (as shown in A,B,C,D,E) to aid in the trialling/planning process. Note that the model shows two previous fusions at C3–4 (with anterior plate) and C5–6. This biomodel was used to plan the removal of the anterior plate as well as an additional fusion and disc replacement. The model aided the surgical team in preparing the revision instrumentation for the plate removal, where the Caspar pins for the C2–C3 level distraction would insert once the C3–4 plate was removed, plan the trajectory to accommodate these steps, as well as plan the order of the procedure (surgical workflow planning). The surgical workflow planning along with the device trialling was estimated to have saved 30–45 min of time in the operating room.