Abstract
Background
Nonunion after medial opening-wedge high tibial osteotomy (OWHTO) is a rare but serious complication with very limited data regarding its treatment. The aim of this study was to analyze the healing rate after operative treatment of nonunion after OWHTO.
Methods
We performed a single-center, retrospective study that included 14 patients with nonunion after OWHTO between 2010 and 2018. The treatment for all patients consisted of local debridement and cancellous bone grafting at the osteotomy gap. Revision osteosynthesis due to a loss of correction/loosening of the locking screws or plates was performed in 5 patients. In 7 patients, lateral hinge fractures were treated with additional lateral plating. Union was confirmed using the modified “Radiographic Union Score for Tibial fractures”. Outcome measure was the Lysholm Knee Score at final follow-up.
Results
The mean age of the patients included in our study was 48.4 ± 6.7 years. Three patients were female (21.4%). The mean follow-up period was 20.8 ± 12.8 months. Union was achieved in 12/14 patients (85.7%) after a mean of 6 months (range, 3–13). The mean Lysholm Knee Score at the final follow-up was 83.2 ± 11.6. Two patients did not reach definitive union during the follow-up. In one patient, an infection of the nonunion following bone grafting was successfully treated with a two-stage procedure. Two patients needed additional cancellous bone grafting 6 and 8 months after the first revision surgery. All patients showed pain-free full weight bearing after union was achieved.
Conclusions
Nonunions after OWHTO can generally be treated successfully with cancellous bone grafting. For patients who have loss of correction, loosening of the osteosynthetic material or fracture of the lateral hinge, an additional revision or additive osteosynthesis may be required.
Level of evidence
Grade III
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Data availability
All of the data are electronically available.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Thomas Rosteius, Dominik Seybold and Jan Geßmann. The first draft of the manuscript was written by Thomas Rosteius, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Rosteius, T., Rausch, V., Lotzien, S. et al. Treatment of aseptic nonunion after medial opening-wedge high tibial osteotomy. Eur J Orthop Surg Traumatol 31, 755–762 (2021). https://doi.org/10.1007/s00590-020-02825-w
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DOI: https://doi.org/10.1007/s00590-020-02825-w