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Clinical Application of Six Axis External Fixator Based on Digital Reduction Technology in the Treatment of Genu Varus in HTO

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DOI: 10.23977/medsc.2022.030719 | Downloads: 8 | Views: 508


Sun Peng 1, Qiao Feng 2


1 Shaanxi University of Chinese Medicine, Xianyang, Shaanxi, 712046, China
2 Xi'an Honghui Hospital, Xi'an, Shaanxi, 710054, China

Corresponding Author

Qiao Feng


The number of patients with osteomyelitis, bone defects and lower limb deformities caused by open fractures of lower extremities has increased significantly, which makes the application of Ilizarov ring external fixator gradually increase. This paper discusses the application of six-axis digital orthopedic external fixator based on CT data in the correction of complex knee deformity. This study retrospectively analyzed 22 genu varus patients who underwent surgery in our department from January 2021 to December 2022. Valgus deformity of distal femur was fixed by medial closed osteotomy TomoFix plate, and varus deformity of tibia was corrected by QSF slow traction. CT scan of lower extremity was performed after osteotomy. Then obtain the adjustment prescription according to the software calculation. Deformities were corrected slowly as prescribed. The self-developed QSF was used for orthosis and fixation. The length of the six connecting rods of the external fixator was adjusted according to the "digital external fixator prescription" at 1 week after operation, and the lower limb force line was slowly corrected. The external fixator was removed after bone healing at the osteotomy site. The postoperative effect was evaluated by analyzing the correction of lower limb alignment, the healing time of osteotomy, the range of motion (Joint association (AKS) score, visual analogue scale (VAS) and Tegner score. It was found that bone union was achieved at the osteotomy site 13 weeks after operation, and the deformity did not recur. The range of motion of the joint was slightly limited during the strap period, and the ROM of the joint was restored to the preoperative level after 4 weeks of removal and fixation. Preoperative knee pain and discomfort, 3 months after surgery, AKS score and Tegner score were significantly improved, the difference was statistically significant (P < 0.05). The six-axis external fixator has been widely used in the treatment of lower limb nonunion, bone defects, horseshoe foot and joint deformities, and the incidence of postoperative complications is significantly lower than that of the Ilizarov ring external fixator.


Digitization, Reset Technology, Six Axis External Fixator, HTO, Genu Varus


Sun Peng, Qiao Feng, Clinical Application of Six Axis External Fixator Based on Digital Reduction Technology in the Treatment of Genu Varus in HTO . MEDS Clinical Medicine (2022) Vol. 3: 115-125. DOI:


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