Foot and ankle surgery : official journal of the European Society of Foot and Ankle Surgeons · 2026
Accuracy of implant positioning in total ankle arthroplasty using patient-specific instrumentation: A weightbearing CT analysis of landmark-based parameters.
СтатьяНазвание и аннотация: Перевод пока не подготовлен
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Garibaldi Riccardo, Lama John E, Henry Jensen K, Lan Ranqing, Demetracopoulos Constantine A, Ellis Scott J
Аннотация
BACKGROUND: Patient-specific instrumentation (PSI) may improve implant positioning in total ankle arthroplasty (TAA), but three-dimensional validation with postoperative weightbearing CT (WBCT) remains limited. This study assessed the accuracy of the INBONE Prophecy system.
METHODS: Fifty-four patients undergoing INBONE II TAA with available Prophecy planning and postoperative WBCT were retrospectively reviewed. Planned and postoperative implant positions were compared for medial tibial component-to-medial malleolus distance, talar stem-to-subtalar joint distance, and talar cut relative to the horizontal axis. Reliability was evaluated using intraclass correlation coefficients.
RESULTS: Distance measurements showed high accuracy, with most cases within 1 mm. Poor accuracy (>2 mm) occurred in 20% of medial malleolar and 7.7% of subtalar measurements. ICCs ranged from 0.79 to 0.95. The mean absolute angular difference for talar cut was 2.91°.
CONCLUSION: INBONE Prophecy PSI accurately reproduced planned distance-based positioning, while sagittal talar alignment was more variable.
METHODS: Fifty-four patients undergoing INBONE II TAA with available Prophecy planning and postoperative WBCT were retrospectively reviewed. Planned and postoperative implant positions were compared for medial tibial component-to-medial malleolus distance, talar stem-to-subtalar joint distance, and talar cut relative to the horizontal axis. Reliability was evaluated using intraclass correlation coefficients.
RESULTS: Distance measurements showed high accuracy, with most cases within 1 mm. Poor accuracy (>2 mm) occurred in 20% of medial malleolar and 7.7% of subtalar measurements. ICCs ranged from 0.79 to 0.95. The mean absolute angular difference for talar cut was 2.91°.
CONCLUSION: INBONE Prophecy PSI accurately reproduced planned distance-based positioning, while sagittal talar alignment was more variable.