title: Biomechanical evaluation of the Boston brace system for the treatment of adolescent idiopathic scoliosis: relationship between strap tension and brace interface forces.
abstract: METHODS
  Prospective study to evaluate the association between strap tension and brace interface forces in the treatment of adolescent idiopathic scoliosis using the Boston brace system.
  
  
  OBJECTIVE
  To determine the strap tension associated with optimal brace interface forces.
  
  
  BACKGROUND
  Trim lines, pad placement, and areas of relief for the brace are guided by radiographic studies. However, optimal adjustment of strap tension is unclear and remains mostly empirical.
  
  
  METHODS
  Brace interface forces in all regions of the trunk were measured for 41 patients with adolescent idiopathic scoliosis at three standardized strap tensions (20 N, 40 N, and 60 N). The brace interface forces were assessed using a mat made of force-sensing transducers. Equivalent interface pressure for each trunk region was also calculated to estimate the distribution of the interface forces.
  
  
  RESULTS
  The brace interface forces and the corresponding effective areas increased along with the strap tension for all patients. For patients with a single right thoracic curve, the interface pressure tended to increase with increasing strap tension. This increase was significant in the left axillary, right thoracic, right pelvic, and sternal regions. For double right thoracic-left lumbar curves, the increase in interface pressure was significant in the left axillary, right pelvic, and sternal regions. However, most of this increase occurred between 20 N and 40 N of strap tension, with only slight increase or even a decrease in interface pressures between 40 N and 60 N.
  
  
  CONCLUSIONS
  The strap tension should be set as high as possible (up to 60 N) for right thoracic curves. For right thoracic-left lumbar curves, the optimal strap tension was approximately 40 N. However, clinicians should ensure that the prescribed strap tension does not cause excessive skin pressure or affect the compliance with the brace. A side opening in the right lumbar area may improve the effectiveness of the brace for double right thoracic-left lumbar curves, but care must be taken to avoid skin problems at the opening.
authors.affiliation: Faculty of Medicine, Université de Montréal, Canada.
authors.forename: Jean-Marc
authors.initials: JM
authors.lastname: Mac-Thiong
authors.forename: Yvan
authors.initials: Y
authors.lastname: Petit
authors.forename: Carl-Eric
authors.initials: CE
authors.lastname: Aubin
authors.forename: Sébastien
authors.initials: S
authors.lastname: Delorme
authors.forename: Jean
authors.initials: J
authors.lastname: Dansereau
authors.forename: Hubert
authors.initials: H
authors.lastname: Labelle
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D001915:Braces; D005260:Female; D006801:Humans; D008297:Male; D011312:Pressure; D011446:Prospective Studies; D012600:Scoliosis / Q000628:therapy*; D013904:Thoracic Vertebrae / Q000002:abnormalities / Q000503:physiopathology; D016896:Treatment Outcome