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(a)
Tangent
inclination
30
70°
110°
φ
= 10°
φ
= 30°
φ
50°
= 50°
20
130°
φ
= 70°
30°
150°
φ
= 110°
φ
= 130°
φ
= 150°
φ
= 170°
10
10°
170°
0
0
4
8
12
16
20
24
28
32
Distance of muscle attachment [mm]
(b)
Tangent
inclination
30
φ
= 10°
φ
= 30°
φ
= 50°
φ
= 70°
φ
70°
110°
50°
20
130°
30°
150°
= 110°
φ
= 130°
φ
10
10°
= 150°
170°
0
φ
= 170°
0
4
8
12
16
20
24
28
32
Distance of muscle attachment [mm]
(c)
Tangent
inclination
30
φ
= 10°
70°
110°
φ
= 30°
50°
20
φ
= 50°
130°
φ
= 70°
φ
= 110°
φ
= 130°
φ
30°
150°
10
10°
= 150°
170°
φ
= 170°
0
0
4
8
12
16
20
24
28
32
Distance of muscle attachment [mm]
(d)
Tangent
inclination
30
φ
= 10°
70°
110°
φ
= 30°
φ
= 50°
φ
= 70°
φ
= 110°
φ
50°
20
130°
30°
150°
10
= 130°
10°
φ
= 150°
φ
= 170°
170°
0
0
4
8
12
16
20
24
28
32
Distance of muscle attachment [mm]
FIGURE 27.6 The translation of the humeral head contact point with the glenohumeral fossa along the Y-axis
during (a) arm abduction 10
8
and 170
8
and the conditions f
10
8
-170
8
and z
0-32 mm; (b) arm abduction
¼
¼
20
8
and 160
8
and the conditions f
10
8
-170
8
and z
0-32 mm; (c) arm abduction 40
8
and 140
8
and the
¼
¼
conditions f
10
8
-170
8
and z
0-32 mm; and (d) arm abduction 70
8
and 110
8
and the conditions f
10
8
-
¼
¼
¼
170
8
and z
0-32 mm.
¼
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