Prophylactic concave-side decompression and spinal cord medialization reduces neurological complications in severe kyphoscoliosis with type 3 cord morphology
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Updated: Jun 11, 2026
Modified Posterior Vertebral Column Resection for Patients with Thoracolumbar Kyphotic Deformity
Published on: September 16, 2022
Yutong Dai1, Yuan-Shun Lo2, Dun Liu1
1Division of Spine Surgery, Department of Orthopedic Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China.
Background Context:
Type 3 spinal cord morphology increases neurological injury risk during 3-column osteotomy (3CO). Prophylactic concave-side decompression and spinal cord medialization (PCDM) is proposed to relieve cord tension, but its clinical utility requires validation.
Purpose:
To evaluate the neuroprotective efficacy of PCDM in patients with severe kyphoscoliosis and type 3 spinal cord morphology undergoing 3CO.
Study Design:
Retrospective comparative cohort study.
Patient Sample:
This study included 236 patients with severe kyphoscoliosis treated with 3CO.
Outcome Measures:
Radiographic parameters, neurological status (Frankel grading), patient-reported outcomes (SRS-22), intraoperative neuromonitoring (IONM) alerts, and perioperative complications were analyzed and compared.
Methods:
The PCDM group (n=132) underwent prophylactic multilevel resection of concave laminae, pedicles, and costovertebral elements to create a medial transposition corridor before 3CO. The non-PCDM group (n=104) received standard 3CO alone.
Results:
Baseline demographics and preoperative radiographic profiles were comparable between groups. Both cohorts achieved substantial deformity correction. The PCDM group showed significant reductions in coronal Cobb angle (80.8°-42.2°) and global kyphosis (71.7°-27.6°), similar to the non-PCDM group (76.7°-39.6° and 66.3°-25.2°, respectively). Notably, the PCDM group exhibited a significantly lower rate of permanent neurological deficits compared to the non-PCDM group (1.5%, 2/132 vs 6.7%, 7/104; p=.046). IONM alert rates were also lower in the PCDM group (8.3% vs 20.2%, p=.012). Among patients with preoperative deficits, neurological recovery was more frequent in the PCDM group (86.7% vs 50.0%, p=.009). Perioperative complication rates were not significantly different (13.6% vs 19.2%, p=.246).
Conclusion:
PCDM appears to offer neuroprotective benefits in high-risk 3CO procedures for patients with type 3 spinal cord morphology, with reduced neurological complications and improved functional outcomes. Its use as a preparatory step prior to osteotomy may be considered as a beneficial adjunct in selected severe deformity cases.
Level Of Evidence:
Level IV.
