Early treatment of type II SMA slows rate of progression of scoliosis

Giorgia Coratti, Jacopo Lenkowicz, Maria Carmela Pera, Adele D'Amico, Claudio Bruno, Consolato Gullì, Noemi Brolatti, Marina Pedemonte, Laura Antonaci, Martina Ricci, Anna Capasso, Gianpaolo Cicala, Costanza Cutrona, Roberto De Sanctis, Sara Carnicella, Nicola Forcina, Michela Cateruccia, Maria Beatrice Damasio, Luca Labianca, Francesca ManfroniAntonio Leone, Enrico Bertini, Enrico Silvio Bertini, Marika Pane, Stefano Patarnello, Vincenzo Valentini, Eugenio Maria Mercuri

Research output: Contribution to journalArticle

Abstract

Background: Type II spinal muscular atrophy (SMA) often leads to scoliosis in up to 90% of cases. While pharmacological treatments have shown improvements in motor function, their impact on scoliosis progression remains unclear. This study aims to evaluate potential differences in scoliosis progression between treated and untreated SMA II patients. Methods: Treatment effect on Cobb's angle annual changes and on reaching a 50° Cobb angle was analysed in treated and untreated type II SMA patients with a minimum 1.5-year follow-up. A sliding cut-off approach identified the optimal treatment subpopulation based on age, Cobb angle and Hammersmith Functional Motor Scale Expanded at the initial visit. Mann-Whitney U-test assessed statistical significance. Results: There were no significant differences in baseline characteristics between the untreated (n=46) and treated (n=39) populations. The mean Cobb angle variation did not significantly differ between the two groups (p=0.4). Optimal cut-off values for a better outcome were found to be having a Cobb angle <26° or an age <4.5 years. When using optimal cut-off, the treated group showed a lower mean Cobb variation compared with the untreated group (5.61 (SD 4.72) degrees/year vs 10.05 (SD 6.38) degrees/year; p=0.01). Cox-regression analysis indicated a protective treatment effect in reaching a 50° Cobb angle, significant in patients <4.5 years old (p=0.016). Conclusion: This study highlights that pharmacological treatment, if initiated early, may slow down the progression of scoliosis in type II SMA patients. Larger studies are warranted to further investigate the effectiveness of individual pharmacological treatment on scoliosis progression in this patient population.
Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Neurology, Neurosurgery and Psychiatry
DOIs
Publication statusPublished - 2023

Keywords

  • NEUROPSYCHIATRY
  • SPINAL MUSCULAR ATROPHY
  • PAEDIATRIC NEUROLOGY

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