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Correction of severe lower extremity deformity with digital hexapod external fixator based on CT data
Yufeng Lu1, Jinfeng Li2, Feng Qiao3
1Department of Integrated Traditional Chinese Medicine (TCM) and Western Medicine Orthopedics, Honghui Hospital, Xi'an Jiaotong University, Xi'an, 710054, Shaanxi, People's Republic of China.
European Journal of Medical Research
|November 18, 2022
Summary
The digital hexapod external fixator (QSF) technique effectively corrected severe lower extremity deformities in adults. This method offers a less invasive approach with reliable fixation, leading to improved patient outcomes and fewer complications.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
Background:
- Severe lower extremity deformities pose significant challenges in orthopedic treatment.
- Accurate correction requires advanced fixation techniques and precise planning.
Purpose of the Study:
- To evaluate the therapeutic efficacy of a self-designed digital six-axis external fixator (QSF) for correcting severe lower extremity deformities.
Main Methods:
- CT data was used for planning the gradual correction of 28 severe tibial deformities with the QSF system.
- 15 femurs underwent osteotomy and internal fixation.
- Preoperative and postoperative measurements of mechanical axis deviation (MAD), mechanical lateral distal femoral angle (mLDFA), mechanical medial proximal tibial angle (mMPTA), limb length discrepancy (LLD), and functional scores (LEFS, KSS) were analyzed.
Main Results:
- The QSF technique achieved significant improvements in MAD, mFTA, and MPTA, correcting deformities effectively.
- While LLD and mLDFA showed no significant difference post-operation, functional scores (LEFS, KSS) substantially improved.
- The QSF adjustment duration averaged 21.4 days, with tibial osteotomy site healing in 17.6 weeks.
Conclusions:
- The QSF technique accurately corrects severe multiplanar tibial deformities in adults.
- Combined with femoral osteotomy, it achieves satisfactory lower extremity alignment.
- Advantages include simple operation, reliable fixation, minimal trauma, and reduced complications.
