Assessment of scapulohumeral rhythm for scapular plane shoulder elevation using a modified digital inclinometer

Table 1 Humeral elevation increments, mean scapular upward rotation measures, and scapulohumeral rhythm ratios

Shoulder elevation increments	Mean scapular upward rotation (± SD)	Scapulohumeral rhythm
0o-120o	35.95 (6.50)	2.34:1
0o-30o	0.73 (4.91)	40.05:1
30o-60o	10.99 (7.18)	1.73:1
60o-90o	8.45 (6.17)	2.55:1
90o-120o	15.78 (7.01)	0.90:1
0o-30o	0.73 (4.91)	40.05:1
30o-45o	5.69 (2.33)	1.64:1
45o-60o	5.29 (6.15)	1.83:1
60o-75o	3.15 (3.67)	3.76:1
75o-90o	5.29 (5.83)	1.83:1
90o-120o	15.78 (7.01)	0.09:1

For each shoulder elevation increment mean ± SD were calculated for scapular upward rotation. Scapular rotation was subtracted from each 15, 30, or 120 degree increment to determine glenohumeral contribution to shoulder elevation. Using the glenohumeral and scapular rotation values, scapulohumeral rhythm (glenohumeral:scapular) was calculated for each increment. SD represents standard deviation.