Abstract
Introduction
Evaluating AIS patients with shoulder imbalance, radiologic angular parameters generally used are: radiographically costoclavicular intersection angle (CCA), angle of the line connecting the coracoids (Corac), the angle of line connecting the upper limit of the first costal angle (FRA), and the tilt angle of the first thoracic vertebra line (T1T). The angles shown on digital photographs are axillary folds line (ax), deltoids peak line (d) and midtrapezial line angle (tra) between the horizontal line.
Material and Methods
A total of 29 cases with AIS are separated into two groups, having distance of horizontal lines drawn from coraciods with 2cm shoulder height differences (SHD) and others. Statistics; paired-samples t-test or wilcoxon tests are used depending on normalization of variables. For each variable ROC analysis is performed. Pearsons correlation analyses used with the changes of shd valvues for each parameter.
Results
Sensitivity of ax is the highest value with 90% than to tra and cca of 80%. Tra and cca angles has highest spesifity valvues with 63.16% than to ax of 57,89%. All radiologic parameters changes found strongly correlated with the changes of shoulder height differences.
Conclusion
The mid trapezial and axillary fold angles over 2,8 and 2,9 degrees respectively is found in shoulder imbalance by cosmetic parameters. The costoclavicular intersection angle over 4 degree is found to be the radiologic shoulder imbalance parameter for ais. These cut off valvues can be usefull for determining the the shoulder imbalance for selection of upper enstrumantation levels in AIS. Midtrapezial angle can be used as a parameter of clinical cosmetic shoulder imbalance in adolescent idiopathic scoliosis. Axillary fold angles and costoclavicular intersection angle can also helpfull for defining shoulder imbalance in adolescent idiopathic scoliosis.