Fig. 1

Measurement of GT position. Line A was drawn parallel to the humeral shaft. Line B and line C were drawn perpendicular to Line A, line B was placed at the upper end of the humeral head and line C was placed at the upper end of the GT. The distance (d) between line B and line C was measured. When the distance (d) was between 5 and 10 mm, the GT was considered correctly position. Malposition of the GT was defined as too low or high