To describe the surgical correction of a multiplanar deformity of the radius in a pony using a single-cut osteotomy. Study design: Case report.Animals: A 9-week-old male Shetland pony foal with a bodyweight of 47 kg. Methods:The foal presented with a complex multiplanar deformity of the right radius. A 3-dimensional model of the bone was created based on computed tomography (CT) imaging. To correct the deformity, the cutting plane for a single-cut osteotomy was calculated following the mathematical approach described by Sangeorzan et al. After osteotomy, the bone was realigned and stabilized with two 4.5 locking compression plates (LCPs).Results: Recovery from surgery was uneventful, and the foal remained comfortable. A CT exam 15 weeks after surgery revealed that diaphyseal deformities improved substantially in procurvatum (from 8 to 1 ), varus (from 27 to 0 ), and rotation (30 to 5 ). The operated radius was 2.1 cm shorter than the left. Eighteenmonth follow up confirmed a functionally and cosmetically acceptable outcome. Conclusion:The single-cut osteotomy resulted in the successful correction of a multiplanar equine long-bone deformity with a favorable outcome in a Shetland pony.Clinical significance: Single-cut osteotomy is an alternative surgical technique for the correction of complex diaphyseal long-bone equine deformities.Computed tomography data and the possibility of printing 3D models provides a significant advantage for rehearsing the procedure and for evaluating the correction that was achieved.
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