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Correlation coefficients for needle length and BMI were calculated. The images of 58 (57.4%) male patients and 43 (42.6%) female patients were evaluated (average BMI, 31.2 kg/m2). The average needle length measurement was 4.27 cm on radiograph and 3.9 cm on MRI. Correlation coefficients were r=0.36 (P=.0002) using radiographs and r=0.53 (P less then .0001) using MRIs. When using the Neviaser approach, there is a moderate positive correlation between BMI and the measured distance between skin and the glenohumeral joint when assessed on