Preoperative Navigation Guides For Total Ankle Replacement

PROPHECY Ankle CT Scan Protocol PROPHECY INBONE™, INFINITY™ and INVISION™ Preoperative Navigation Reports and Guides are patient-specific tools for total ankle replacement surgery. Adherence to his lower extremity CT protocol of the ankle, with knee, is critical for success. In every case, please follow these 4 pages of instructions: Patient Position Patient in supine position. The foot of interest should be positioned in neutral (90°) to the leg. FIGURE 1 Note: If this is not possible due to a patient’s condition, such as severe contracture, ensure the CT scan contains slices through the ball...

PROPHECY Ankle CT Scan Protocol This “ankle” protocol involves a section at the knee. REQUIRED: Provide full Knee-to-Foot CT “scout” images (coronal & sagittal). Scan both the Foot-&-Ankle AND Knee sections at the same time. Sagittal Scout Refer to additional requirements on previous page. Refer to typical errors and FAQs on next pages. Coronal Scout Maintain alignment of edges of scan groups. REQUIRED: Scan 5cm proximal, and 5cm distal to the knee joint line. Slice increment: 5mm (or smaller). REQUIRED: Ankle and foot scan slice increment: 1.25mm (or smaller). Scan >10cm above the joint line...

Common Scan Protocol Errors The most common protocol errors resulting in failed scans are shown below: Region missing from scan. FIGURE 4 Failure to scan the entire foot. FIGURE 5 Failure to scan the entire foot. FIGURE 6 Failure to scan at least 10cm above the ankle joint. FIGURE 7 Scan of the knee was not performed simultaneously with the ankle. Unacceptable CT imaging Blurry, poor contrast. Satisfactory CT Imaging Clear, sharp, distinct boundaries between bone & soft tissue.

Frequently Asked Questions Q. “I can’t put in a 1.25mm slice. I can only do a 1mm increment. Is that ok?” A. Slices thinner than our specified slice thickness are acceptable; however, using larger slices will result in the scan being rejected for PROPHECY processing. Q. “Do we use axial or helical reconstruction?” A. Either is acceptable. Q. “Is it really necessary to scan 10cm above the ankle joint?” A. Yes. At least 10cm of the tibia shaft, measured from the ankle joint line, is required. Q. “Do I need to scan the knee for an ankle surgery? A. Yes. The knee scan is required to obtain the complete...

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