Survival Analysis Of A Group Of 365 Idiopathic Scoliosis Patients Consecutively Treated with The SpineCor System At Sainte-Justine Hospital

Purpose: The objective of this study is to show the effectiveness of the SpineCor system dedicated to the treatment of the idiopathic scoliosis.

Methods: 365 idiopathic scoliosis patients treated by the SpineCor System was followed at Sainte- Justine Hospital. The patients cohort was categorized before treatment into two groups according to their initial Cobb angle: group 1 (15 to 29 degrees) and group 2 (30 degrees and more). A survival analysis was carried out in order to evaluate the cumulative probability of success during the treatment, the follow-up and for the period combining the treatment and the follow-up. Success was defined as either stabilization or a reduction of 5º or more of the initial Cobb angle and failure as a worsening of more than 5º.

Results: The survival analysis indicated a cumulative probability of success that is stable during the post-treatment follow-up period (Year 1: 0.97, .093; Year 2: 0.94, 0.88; Year 3: 0.91, 0.84; Year 4: 0.79, 0.84. for the group 1 and 2 respectively). There is an overall probability of success of 0.97 and 0.83 at 4 years; 0.85 and 0.61 at 7 years for group 1 and group 2 respectively of combined treatment and posttreatment follow-up. At five years post weaning there was a permanent correction for 65.4% of the patients, 30.8% had a stabilisation and 3.8% had worsened.

Conclusion: Because of the progressive reduction of the pathological defects, owing to the fact that SpineCor system does not offer any effect of distraction or support and of maintains of an effective musculature, there is only one very small percentage (3.8 %) of loss of correction 5 years after the end of bracing.

Significance: The conservative treatment with SpineCor brace in A.I.S. is efficient.