Study design:

Retrospective cohort study.

Purpose:

This study aimed to evaluate the clinical and radiological outcomes of nonfusion anterior scoliosis correction (NFASC) in patients with idiopathic scoliosis and comprehensively analyze its principles.

Overview of literature:

NFASC is a novel revolutionary motion-preserving surgery for idiopathic scoliosis. However, clinical data related to this procedure remain scarce, with no conclusive guidelines regarding case indications, proper technique, and possible complications.

Methods:

This study included patients with adolescent idiopathic scoliosis (AIS) who were treated with NFASC for a structural major curve (Cobb angle, 40°-80°) with more than 50% flexibility on dynamic X-rays. The mean follow-up was 26±12.2 months (range, 12- 60 months). Clinical and radiological data such as skeletal maturity, curve type, Cobb angle, surgery details, and Scoliosis Research Society-22 revised (SRS-22r) questionnaire were collected. Statistically significant trends were examined by post hoc analysis following repeated measures analysis of variance test.

Results:

A total of 75 patients (70 females, five males) were included, with a mean age of 14.96±2.69 years. The mean Risser and Sanders scores were 4.22±0.7 and 7.15±0.74, respectively. The mean main thoracic Cobb angles at the first and second follow-up (17.2°±5.36° and 16.92°±5.06°, respectively) were significantly lower than the preoperative Cobb angles (52.11°±7.74°) (p <0.05). Similarly, the mean thoracolumbar/lumbar Cobb angle significantly improved from the preoperative period (51.45°±11.26°) to the first follow-up (13.48°±5.11°) and last follow-up (14.24°±4.85°) (p <0.05). The mean preoperative and postoperative SRS-22r scores were 78.0±3.2 and 92.5±3.1, respectively (p <0.05). None of the patients had any complications until the most recent follow-up.

Conclusions:

NFASC offers promising curve correction and curve progression stabilization in patients with AIS, with a low risk for complications and preservation of spinal mobility and sagittal parameters. Thus, it proves to be a favorable alternative to fusion modality.