Abstract
Background
Our objective was to assess clinical and radiological findings following a medial opening wedge high tibial osteotomy using a biphasic calcium phosphate (BCP) synthetic bone substitute, designed as a wedge with two differing zones of density. The in-vivo behaviour of this type of bone substitute over time is currently unknown.
Hypothesis
Our hypothesis was that BCP synthetic bone would facilitate bone union and undergo replacement with host bone over the study period.
Patients and methods
Fifteen sequential patients were followed prospectively for minimum 4-years post-operatively. All patients were evaluated clinically using patient reported outcome measures and radiologically to evaluate alignment with maintenance of the osteotomy correction, and bone union with expected BCP dissolution.
Results
All patients had good clinical scores with no reported complications at 4 years. In all cases there were radiographic findings of bone union with consolidation and no loss of correction. However the graft remained densely radiopaque at final follow-up.
Discussions
This study demonstrates that a BCP graft in combination with a locking plate for a medial opening wedge HTO allows early weight-bearing, maintains correction and provides good clinical outcomes. Whilst higher densities of BCP are strong, they do not resorb fully, remaining radiographically visible. This may have implications for the performance of a future knee arthroplasty and caution should therefore be taken.
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This study was approved by the local ethics committee (NSLHD HREC RESP/17/110).
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Putnis, S., Neri, T., Klasan, A. et al. The outcome of biphasic calcium phosphate bone substitute in a medial opening wedge high tibial osteotomy. J Mater Sci: Mater Med 31, 53 (2020). https://doi.org/10.1007/s10856-020-06391-9
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DOI: https://doi.org/10.1007/s10856-020-06391-9