CORRELATION BETWEEN FINAL RESULT AND FIRST X-RAY WITHOUT BRACE 6 MONTHS
AFTER FITTING ARTBRACE: CASE SERIES OF THE 33 FIRST CONSECUTIVE PATIENTS.
Authors and Institutions: De Mauroy JC, Gagliano F, Barral F, Pourret S.
Introduction: The very high rigidity of the polycarbonate makes it
possible to replace the plaster cast. The ARTbrace is designed from a digital
cast made by superimposing the frontal and sagittal corrections of 3 blocks:
pelvis, lumbar and thoracic. This unique feature ensures an average in-brace
correction of 70% during treatment. The ability to predict the final result is
an element of compliance and sometimes of earlier orientation towards surgery.
Objective(s): The aim is to determine the correlation coefficient between
the correction at 6 months and the final correction 2 years after weaning the
Method(s): Of the first 300 patients treated in Lyon since May 2013, 33
(29 females/4males) were reviewed 2 years after brace weaning (from September
2016 to September 2017). From our prospective database, the Cobb angle of 45
primitive curves (22 thoracic and 23 lumbar) was studied: initial, in-brace, at
6 months, at the end of treatment, 6 months and 2 years after brace weaning.
The paired sample correlation T-test and non-parametric Spearman and Pearson was
performed using the SPSS v20 package for Cobb angle at 6 months and 2 years
Result(s) and Discussions: The 33 patients had an initial mean age of
The initial mean angulation is: 27.3° (SD = 6.51)
The average in-brace angulation is: 8.27 (SD = 8.32)
The average angulation at 6 months without brace is: 16.52 (SD=9.36)
The average angulation two years after weaning is: 18.31° (SD=9.03)
The average In-brace correction percentage is 70%, the definitive average
correction 2 years after brace weaning is 32.6%.
The progression of curve magnitude is presented in figure 1.
A paired-sample t-test was conducted to compare Cobb angulation at 6 months and
Cobb angulation 2 years after brace weaning. For thoracic curves, there was no
significant difference in the scores at 6 months (M=19.65, SD=9.016) and final
(M=20.14, SD=8.919). For lumbar curves, there was no significant difference in
the scores at 6 months (M=17.17, SD=9.079) and final (M=16.57, SD=8.974).
A Pearson product-moment correlation coefficient was computed to assess the
relationship between Cobb angulation at 6 months and Cobb angulation 2 years
after brace weaning There was a strong positive correlation between the two
variables, r = .897, n = 22, p<0.001 for thoracic curves and r=.870, n=23
p<0.001 for lumbar curves.
A Spearman's rank-order correlation was run to determine the relationship
between Cobb angulation at 6 months and Cobb angulation 2 years after brace
weaning. There was a strong, positive correlation, which was statistically
significant for thoracic curves (rs(22) = .885, p <0.01) and for lumbar curves
(rs(23) = .883, p <0.01)
The initial mean angulation is lower than the 30° initial general average of the
prospective study because it does not yet include the most important curvatures
with a longer treatment time.
Conclusion(s) and Significance: The average in-brace correction of 70%
has not changed since the beginning of the prospective study.
The final correction of more than 30% is the equivalent of most in-brace
corrections published to date.
The correlation between angulation at 6 months and the final outcome is close to
0.9, which makes it possible to predict the final result very early and answers
a question often asked by parents. Then the final result depends only on