2017 ISAKOS Biennial Congress ePoster #1513

 

Computer Assisted Navigation Guided High Tibial Osteotomy Using Total Knee Navigation System

Kan-Yip Law, FRCS HONG KONG
Kin Wai Lam, FRCS, Hong Kong HONG KONG
Hon Shuen Ho, FRCS, Hong Kong HONG KONG
Hang Cheong Cheng, FRCS, Hong Kong HONG KONG

United Christian Hospital, Hong Kong, Hong Kong, HONG KONG

FDA Status Cleared

Summary

Navigation guided high tibial osteotomy using total knee software gives accurate and satisfactory postoperative coronal and sagittal alignment with minimal complication rate.

Abstract

Introduction

High tibial osteotomy(HTO) performed using traditional fluoroscopic technique demonstrated high variability in postoperative alignment. The aim of current study is to verify the accuracy of computer assisted navigation guided HTO using total knee navigation system.

Material And Methods

All navigation guided HTO performed between Jan 2014-Dec 2015 were recruited. Age, sex, preoperative, intraoperative and postoperative alignment, percentage of intersection of mechanical axis over tibial plateau, deviation of intraoperative vs postoperative alignment, change in tibial slope, operative time, degree of pain relief, range of motion and complications were recorded.

Results

14 cases (3 bilateral, 11 unilateral) were recruited. The average age was 53.4 (48-58). The mean operative time was 163.5min (146-197). The mean preoperative alignment was 10.1°(5-18)varus. The mean intraoperative alignment was 1.8°(1.5-2.5)valgus. The mean postoperative alignment was 2.6°(2-4)valgus. There was no significant difference between intraoperative and postoperative alignment. The average intersection of mechanical axis over tibial plateau was 57.2% from medial tibial plateau. The average change in tibial slope was 0.1°(-2-3). Mean pain score improved from 8.7 to 2.5. There was no significant difference between pre and postoperative range of motion. There was 1 case of non-union that need bone grafting, one case of intraoperative breakage of navigation tracker tibial pin.

Discussion And Conclusion

Navigation guided HTO using total knee software gives satisfactory postoperative coronal and sagittal alignment with minimal complication rate.