The Scapula Movement of Idiopathic Scoliosis Patients
in Lateral Elevation

Abstract

We investigated the scoliosis syndrome patient's scapula movement in lateral elevation before and after operation. Subjects were 10 patients (1 male, 9 female), and average age at the operation was 15.8 years old. The assessments were presence of Slipping of a humeral head in the arm at maximum elevation, and dynamic instability of the shoulder. We took a picture of both scapulas front images in natural standing, the 90° lateral elevation and the maximum elevation before and after operation. We measured α and β angles, and the translation rate of glenoid following what Murata et al. reported. Results showed the α angle was changed from 86.4° to 84.5° in convex, and from 80.1° to 80.7° in concave. β angel 1 was changed form 21.3° to 21.0° in convex, and 23.7° to 26.8° in concave. β angel 2 was changed form 41.1° to 36.4° in convex, 45.4° to 43.6° in concave. The translation rate of glenoid from 0 to 90° was changed from 1.24 to 1.24 in convex, and 1.29 to 1.33 in concave. The rate from 0 to maximal elevation was form 1.48 to 1.43 in convex, and from 1.57 to 1.54 in concave. Thus the convex shoulder might be more unstable than the concave shoulder.