A work study of the CAD/CAM method and conventional manual method in the fabrication of spinal orthoses for patients with adolescent idiopathic scoliosis

A study was conducted to compare the CAD/CAM method with the conventional manual method in fabrication of spinal orthoses for patients with adolescent idiopathic scoliosis. Ten subjects were recruited for this study. Efficiency analyses of the two methods were performed from cast filling/digitization process to completion of cast/image rectification. The dimensional changes of the casts/models rectified by the two cast rectification methods were also investigated. The results demonstrated that the CAD/CAM method was faster than the conventional manual method in the studied processes. The mean rectification time of the CAD/CAM method was shorter than that of the conventional manual method by 108.3 min (63.5%). This indicated that the CAD/CAM method took about 1/3 of the time of the conventional manual to finish cast rectification. In the comparison of cast/image dimensional differences between the conventional manual method and the CAD/CAM method, five major dimensions in each of the five rectified regions namely the axilla, thoracic, lumbar, abdominal and pelvic regions were involved. There were no significant dimensional differences (p < 0.05) in 19 out of the 25 studied dimensions. This study demonstrated that the CAD/CAM system could save the time in the rectification process and offer a relatively high resemblance in cast rectification as compared with the conventional manual method.

[1]  A F Mak,et al.  Effectiveness and biomechanics of spinal orthoses in the treatment of adolescent idiopathic scoliosis (AIS) , 2000, Prosthetics and orthotics international.

[2]  K. Luk,et al.  Effect of different casting methods on adolescent idiopathic scoliosis , 2003, Prosthetics and orthotics international.

[3]  D. S. Scott,et al.  Nighttime Bracing for Adolescent Idiopathic Scoliosis with the Charleston Bending Brace: Preliminary Report , 1990, Spine.

[4]  Price Ct A meta-analysis of the efficacy of non-operative treatments for idiopathic scoliosis. , 1998 .

[5]  J. Evans,et al.  Biomechanical evaluation of the Milwaukee brace , 1998, Prosthetics and orthotics international.

[6]  Ibrahim Zeid,et al.  CAD/CAM theory and practice , 1991 .

[7]  R. Winter,et al.  The Milwaukee brace for the treatment of adolescent idiopathic scoliosis. A review of one thousand and twenty patients. , 1994, The Journal of bone and joint surgery. American volume.

[8]  J. R. Bowen,et al.  Adolescent Idiopathic Scoliosis: Treatment with the Wilmington Brace. A Comparison of Full-Time and Part-Time Use* , 1996, The Journal of bone and joint surgery. American volume.

[9]  D. Katz,et al.  A Comparison Between the Boston Brace and the Charleston Bending Brace in Adolescent Idiopathic Scoliosis , 1997, Spine.

[10]  T. Renshaw,et al.  Results of Treatment of Idiopathic Scoliosis with the Charleston Bending Orthosis , 1990, Spine.

[11]  C. Ottaviani,et al.  Effectiveness of Nonsurgical Treatment for Idiopathic Scoliosis Overview of Available Evidence , 1991, Spine.

[12]  M. Wong,et al.  Critical review on non-operative management of adolescent idiopathic scoliosis , 2003, Prosthetics and orthotics international.

[13]  D. S. Scott,et al.  Nighttime bracing for adolescent idiopathic scoliosis with the Charleston Bending Brace: long-term follow-up. , 1997, Journal of pediatric orthopedics.

[14]  D. Gardner-Bonneau,et al.  A Meta-Analysis of the Efficacy of Non-Operative Treatments for Idiopathic Scoliosis*† , 1997, The Journal of bone and joint surgery. American volume.