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Computer-assisted navigation decreases the change in the tibial posterior slope angle after closed-wedge high tibial osteotomy

  • Knee
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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

The purpose of the present study was to compare the change in tibial posterior slope angle (PSA) between patients treated via computer-assisted and conventional closed-wedge high tibial osteotomy (CWHTO). It was hypothesized that a decrease in the PSA would be less in the computer-assisted group than in the conventional group.

Methods

Data on a total of 75 computer-assisted CWHTOs (60 patients) and 75 conventional CWHTOs (49 patients) were retrospectively compared using matched pair analysis. The pre- and postoperative mechanical axis (MA) and the PSA were radiographically evaluated. The parallel angle was defined as the angle between the joint line and the osteotomy surface. The data were compared between the two groups.

Results

The postoperative radiographic MA averaged 1.3° ± 2.6° valgus in the computer-assisted group and 0.3° ± 3.1° varus in the conventional group. The change in PSA averaged −0.8° ± 0.9° in the computer-assisted group and −4.0° ± 2.2° in the conventional group. The parallel angle averaged 0.2° ± 3.0° in the computer-assisted group and 6.2° ± 5.3° in the conventional group.

Conclusion

Computer-assisted CWHTO using four guide pins could avoid inadvertent change in the PSA. The navigation can be used in anticipation of decreasing the risk of change in the PSA in CWHTO, especially in patients whose preoperative PSA is small. The special attention should be paid to locate the hinge axis acutely and to make the parallel proximal and distal osteotomy surfaces during CWHTO.

Level of evidence

III.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University, 23 Kyunghee-daero, Dongdaemun-gu, Seoul, 130-872, South Korea

    Dae Kyung Bae, Young Wan Ko, Sang Jun Kim, Jong Hun Baek & Sang Jun Song

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  1. Dae Kyung Bae
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  2. Young Wan Ko
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  3. Sang Jun Kim
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  4. Jong Hun Baek
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Correspondence to Sang Jun Song.

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Bae, D.K., Ko, Y.W., Kim, S.J. et al. Computer-assisted navigation decreases the change in the tibial posterior slope angle after closed-wedge high tibial osteotomy. Knee Surg Sports Traumatol Arthrosc 24, 3433–3440 (2016). https://doi.org/10.1007/s00167-016-4032-2

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