Comparison of biomechanical behavior between a cast material torso jacket and a polyethylene based jacket
© Rizza et al; licensee BioMed Central Ltd. 2015
Published: 19 January 2015
Numerous designs are often used in the treatment of early onset of scoliosis. A Thoraco-Lumbo-Sacral Orthosis (TLSO) is constructed using Polyethylene (PE). A series of casting is implemented using cast material. The Cast material is less dense, allows the skin to breathe, and is made of a biodegradable water based resin (3M, BSN Medical). TLSO braces provide correction mechanically through constraint forces, which are minimized with excessive lateral defection.
This study was motivated by goal to compare the biomechanical behavior of the cast based jacket with a PE based design.
Materials and methods
Both designs will generate the proper constraint forces to maintain spinal correction. Based on the design parameters (thickness, mechanical properties, FOS and cost) the brace made of cast material, though slightly thicker (6.6 mm compared to 4 mm) would be 3.5 times lighter and cost half as much (based on material costs). Furthermore the cast brace has double the strength. Thus, from the biomechanical point of view, the cast brace is more efficient than the PE brace.
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