RESUMEN
PURPOSE: Spinal deformities in patients with Spondyloepiphyseal Dysplasia congenita are particularly challenging to treat. Addressing these deformities requires a holistic surgical strategy. The aim of this case report is to highlight an original preoperative protocol combining atlantoaxial instability stabilization by halo jacket with progressive correction of a thoracic kyphoscoliosis using continuous elongation by tension plaster cast as described by Stagnara. METHOD: A 16-year-old patient with spondyloepiphyseal dysplasia congenita presenting a severe thoracic kyphoscoliosis associated with atlantoaxial instability causing cervical myelopathy was managed through a preoperative protocol combining a halo jacket with a Stagnara elongation cast allowing progressive correction of the kyphoscoliosis while stabilizing the cervical instability. RESULTS: The preoperative protocol allowed a safer and a more effective surgical spine fusion, reducing neurological risks, improving the final correction, and offering better postoperative recovery. Clinical and radiological solid fusion was observed at 3-year-follow-up with significant improvement of the patient's quality of life. CONCLUSION: This case report highlights the effectiveness of the preoperative preparation combining a halo jacket with a Stagnara elongation cast to safely stabilize the cervical spine while correcting the thoracic kyphoscoliosis. This strategy can serve as a valuable tool for spine teams when addressing complex spinal deformities particularly in this patient with SEDc. LEVEL OF EVIDENCE: Level IV.