Abstract
Purpose
Analysis of the structure of the fractures of opposite hinge (FOH) after angle-stable closed-wedge (CW) and open-wedge (OW) high tibial osteotomy (HTO), and their influence on the development of tibial pseudarthrosis.
Methods
187 CW and 94 OWHTOs were analyzed retrospectively. The FOHs in the OWHTO were classified according to Takeuchi, and in the CWHTO—according to the own classification with two types (depending on the direction of FOH). FOHs in both techniques were also subdivided into three subtypes according to displacement (A—non-displaced, B—primarily displaced, C—secondarily displaced). The statistical analysis included correlation analysis and logistic regression.
Results
FOHs were found in 81 (43.3%) CW and 39 (41.2%) OWHTOs. The stable type 1 fractures predominated in OWHTO (76.9 vs. 42%, p < 0.001), the unstable type 2 FOHs prevailed in CWHTO (58 vs. 17.9%, p < 0.001). The tibial pseudarthrosis rate was higher with type 1 (20 vs. 12.9%, n.s.) and subtype A (16.7 vs. 6.8%, p = 0.048) FOHs in OWHTO, and with type 2 (20 vs. 0%, p < 0.001) and subtypes B (25 vs. 0%, p < 0.001) and C (29.4 vs. 25%, n.s.) in CWHTO (without FOHs 0.9% in CW and 1.8% in OWHTO, n.s.). Relevant correlations were detected between the pseudarthrosis rate and fracture type only in CWHTO (ρs = 0.298, p < 0.001, OR 24.87 for type 2) and displacement subtype in both groups (for subtype C: ρs = 0.345, p < 0.001, OR 43.75 and ρs = 0.231, p = 0.02, OR 18.0, respectively).
Conclusions
The unstable FOH types were more common in CWHTO. The displacement subtype was more predictive for the development of tibial pseudarthrosis than the fracture type, especially in OWHTO. The secondarily displaced FOHs (subtype C) represented the highest risk for the occurrence of pseudarthrosis in both techniques.
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AD contributed to design and objectives of this study, data collection, statistical analysis and writing. AT is a surgeon and contributed to the data collection and preparing the manuscript. MB contributed to the data collection and radiological evaluation. WD is a senior surgeon and contributed to design of this study and edition of the manuscript. RS is a senior surgeon and contributed to design of this study, statistical analysis and supervision of the study. All authors read and approved the manuscript.
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Dorofeev, A., Tylla, A., Benco, M. et al. Opposite hinge fractures in high tibial osteotomy: a displacement subtype is more critical than a fracture type. Eur J Orthop Surg Traumatol 30, 297–305 (2020). https://doi.org/10.1007/s00590-019-02549-6
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DOI: https://doi.org/10.1007/s00590-019-02549-6