A combined anterior and posterior surgical approach is generally recommended in the treatment of severe congenital kyphosis, despite the fact that the anterior vascular supply of the spine and viscera are at risk during exposure. The aim of this study was to determine whether the surgical treatment of severe congenital thoracolumbar kyphosis through a single posterior approach is feasible, safe and effective.

We reviewed the records of ten patients with a mean age of 11.1 years (5.4 to 14.1) who underwent surgery either by pedicle subtraction osteotomy or by vertebral column resection with instrumented fusion through a single posterior approach.

The mean kyphotic deformity improved from 59.9° (45° to 110°) pre-operatively to 17.5° (3° to 40°) at a mean follow-up of 47.0 months (29 to 85). Spinal cord monitoring was used in all patients and there were no complications during surgery. These promising results indicate the possible advantages of the described technique over the established procedures. We believe that surgery should be performed in case of documented progression and before structural secondary curves develop. Our current strategy after documented progression is to recommend surgery at the age of five years and when 90% of the diameter of the spinal canal has already developed.

Cite this article: Bone Joint J 2013;95-B:1527–32.

Background: Congenital anomalies of the chest wall and Sprengel’s shoulder are often associated with congenital deformities of the spine. It has been suggested that extensive rib fusions on the concavity of a congenital scoliosis may adversely affect progression of the spine deformity, thoracic function and growth of the lungs, which can lead to a thoracic insufficiency syndrome. Methods: This is a retrospective study of the medical records and spine radiographs of 620 consecutive patients with congenital spine deformities. The rib anomalies were classified into simple and complex and the presence of a Sprengel’s shoulder was recorded. Subjects: There were 497 patients (80%) with scoliosis, 88 patients (14%) with kyphoscoliosis, and 35 patients with kyphosis (6%). The mean rate of scoliosis deterioration without treatment, age and curve size at surgery was compared for the different types of vertebral abnormalities in patients with and without rib anomalies. Results: Rib anomalies occurred in 124 patients. The rib anomalies were simple in 97 patients (78%) and complex in 27 (22%). The most common simple rib anomaly (70 patients; 72%) was a fusion of two or three ribs. The most common complex rib anomaly (20 patients; 74%) was a fusion of multiple ribs associated with a large chest wall defect. Rib anomalies were most commonly associated with a congenital scoliosis (116 patients; 93.6%), and much less frequently with a congenital kyphoscoliosis or kyphosis (8 patients). In those patients with a scoliosis, the rib anomalies were simple in 91 patients (78.5%) and complex in 25 patients (21.5%). Eighty-eight of the 124 patients (76%) with rib abnormalities had a scoliosis due to a unilateral unsegmented bar with or without contra-lateral hemivertebrae at the same level, and 8 patients had mixed unclassifiable vertebral anomalies. In contrast, only 17 patients with a scoliosis and rib anomalies had hemivertebrae alone. The rib anomalies were most frequently associated with a thoracic or thoracolumbar scoliosis (107 patients; 92.2%) and occurred on the concavity in 81 patients (70%), convexity in 27 patients (23%), and were bilateral in 8 patients. Sprengel’s deformity occurred in 45 patients; 43 patients with congenital scoliosis (8.6%), and 2 with kyphoscoliosis or kyphosis. A Sprengel’s shoulder occurred most frequently in association with a thoracic scoliosis due to a unilateral failure of vertebral segmentation (28 patients). The elevated shoulder was on the concavity of scoliosis in 26 patients and on the convexity in 16 patients. We compared the mean rate of curve progression without treatment, the age and curve size at spine surgery for the different types of spine deformities in patients with and without rib anomalies either simple or complex and found no significant difference (p> 0.05); the only statistical difference was that the mean age at surgery was higher for patients with a unilateral unsegmented bar without rib anomalies (p=0.005). Conclusion: Congenital rib anomalies and Sprengel’s shoulder occur most commonly on the concavity of a thoracic or thoracolumbar congenital scoliosis due to a unilateral failure of vertebral segmentation. However, these anomalies do not have an adverse effect on curve size or rate of progression