2017 ISAKOS Biennial Congress ePoster #1527

 

A Novel Technique In Open Wedge High Tibial Osteotomy To Preserve The Tibial Slope (Basic Study On Cadaver And Reconstruction Ct Scanning)

Hamidreza Yazdi, MD, Tehran IRAN, ISLAMIC REPUBLIC OF
Mehran Radi, MD, Tehran IRAN, ISLAMIC REPUBLIC OF
Masoud Hosseiny, MSc, Tehran IRAN, ISLAMIC REPUBLIC OF
Mohhamadreza Mallakzadeh, PhD, Tehran IRAN, ISLAMIC REPUBLIC OF

Iran university of medical sience and Iran University of Science and Technology, Tehran, IRAN, ISLAMIC REPUBLIC OF

FDA Status Not Applicable

Summary

Use of this new technique in open wedge HTO can result in good varus correction with minimal changes to the tibial slope

Abstract

Introduction

High tibial osteotomy (HTO) is a well-established treatment option for uni-compartmental osteoarthritis. Recently, medial opening wedge HTO has become the primary surgical technique. It is very important in a high tibial open wedge osteotomy to keep the slope unchanged in the sagittal plane. The purpose of this study is to introduce a quantitative method of open wedge HTO to preserve the tibial slope without considering the osteotomy line.

Materials And Methods

At first , mathematical calculations were concentrated, and the relations ,formulas and tables were extracted . The results of formulas and tables were examined using software on reconstruction CT scanning of two intact tibiae. Then the results of the calculations were tested on five fresh cadavers.

Results

Software results showed that the changes in slope angle using the simplified formulas and tables are less than 0.5° in both subjects. Based on the p-value, the simplified formula or the tables can be used to correct the varus with minimal change in the slope and without considering osteotomy line. Results from osteotomies on 5 bones showed that changes in slope angle were significantly small. In 3 subjects, the change was less than 0.6°.

Conclusion

Use of this new technique in open wedge HTO can result in good varus correction with minimal changes to the tibial slope, regardless of the orientation of the osteotomy line.