Background
Methods
Results and discussion
Description of the sample
MEAN ± SD (range: min-max.) | |
---|---|
Age (yrs)
| 38.5 ± 9.4 (20–55) |
Height (cm)
| 163.6 ± 6 (150–180) |
Weight (Kg)
| 62.1 ± 12 (40–115) |
BMI (Kg/m
2
)
| 23.2 ± 4.2 (14.5-41.9) |
Pull force dominant arm (Kg)
| 6.3 ± 2.4 (3.6-11.8) |
Pull force non-dominant arm (Kg)
| 5.8 ± 1.8 (3.1-11.8) |
Right dominance
| 93.7% |
Left dominance
| 6.3% |
Age | Height cm | Weight Kg | BMI Kg/m2
| Pull force Kg | |||
---|---|---|---|---|---|---|---|
Dominant | Non-dominant | ||||||
Yrs | No. | % | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD | Mean ± SD |
20-24
| 22 |
7.3
| 164.9 ± 5.6 | 59.2 ± 10.4 | 21.7 ± 3.35 | 6.3 ± 1.6 | 5.7 ± 1.5 |
25-29
| 36 |
11.9
| 164.5 ± 5.6 | 61.0 ± 11.3 | 22.4 ± 3.44 | 5.7 ± 1.6 | 5.3 ± 1.6 |
30-34
| 46 |
15.2
| 163.1 ± 5.9 | 59.7 ± 9.9 | 22.4 ± 3.56 | 6.4 ± 1.8 | 6.2 ± 1.5 |
35-39
| 61 |
20.2
| 164.2 ± 6.8 | 62.4 ± 14.3 | 23.0 ± 4.55 | 6.6 ± 1.9 | 6.1 ± 1.6 |
40-44
| 43 |
14.2
| 165.1 ± 5.9 | 60.3 ± 10.1 | 22.1 ± 3.73 | 6.1 ± 2 | 5.8 ± 1.9 |
45-49
| 42 |
13.9
| 163.7 ± 5.1 | 65.3 ± 11.2 | 24.4 ± 4.30 | 6.2 ± 2.5 | 5.8 ± 2.1 |
50-55
| 52 |
17.2
| 160.7 ± 5.9 | 64.7 ± 13.2 | 25.0 ± 4.80 | 6.1 ± 1.9 | 5.5 ± 1.8 |
Subjects self reported status and shoulder symptoms
Age | Physical standardized component | Mental standardized component | ||
---|---|---|---|---|
Yrs | No. |
%
| Mean ± SD | Mean ± SD |
20-24 | 22 |
7.3
| 55.3 ± 5.5 | 48.7 ± 11.9 |
25-29 | 36 |
11.9
| 54.7 ± 4.8 | 49.3 ± 7.5 |
30-34 | 46 |
15.2
| 52.3 ± 8.2 | 46.8 ± 10.8 |
35-39 | 61 |
20.2
| 51.2 ± 9.0 | 50.2 ± 8.0 |
40-44 | 43 |
14.2
| 51.2 ± 6.0 | 47.8 ± 8.8 |
45-49 | 42 |
13.9
| 48.4 ± 8.7 | 49.9 ± 9.5 |
50-55 | 52 |
17.2
| 46.0 ± 10.1 | 48.2 ± 8.9 |
Total
|
302
|
100
|
50.8 ± 8.5
|
48.7 ± 9.2
|
Anova between groups for Physical Standardized Component: F = 6.375, p = 0.001* | ||||
Anova between groups for Mental Standardized Component: F = 0.818, p = 0.556 |
Age | Dominant shoulder | Non-dominant shoulder | Bilateral | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Symptomatic (60) | Asymptomatic (242) | Symptomatic (38) | Asymptomatic (264) | Symptomatic (21) | ||||||||
Yrs | No. |
%
| No. |
%
| No. |
%
| No. |
%
| No. |
%
| No. |
%
|
20-24 |
22
|
7.3
|
0
|
0
|
22
|
100
|
0
|
0
|
22
|
100
|
0
|
0
|
25-29 |
36
|
11.9
|
2
|
5.6
|
34
|
94.4
|
1
|
2.8
|
35
|
97.2
|
0
|
0
|
30-34 |
46
|
15.2
|
8
|
17.4
|
38
|
82.6
|
2
|
4.3
|
44
|
95.7
|
2
|
4.3
|
35-39 |
61
|
20.2
|
8
|
23.3
|
53
|
76.7
|
6
|
9.8
|
55
|
90.2
|
3
|
4.9
|
40-44 |
43
|
14.3
|
10
|
31
|
33
|
69
|
14
|
32.6
|
29
|
67.4
|
6
|
13.9
|
45-49 |
42
|
13.9
|
13
|
36.5
|
29
|
63.5
|
2
|
4.8
|
40
|
95.2
|
2
|
4.7
|
50-55 |
52
|
17.2
|
19
|
19.9
|
33
|
80.1
|
13
|
25
|
39
|
75
|
8
|
15.3
|
X
2
= 24.640; p = 0.001*
|
X
2
= 34.741; p = 0.001*
|
Clinical shoulder abnormality
Age | Dominant shoulder | Non-dominant shoulder | Bilateral | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Abnormal (26) | Normal (276) | Abnormal (11) | Normal (291) | Abnormal (6) | ||||||||
Yrs | No. |
%
| No. |
%
| No. |
%
| No. |
%
| No. |
%
| No. |
%
|
20-24
|
22
|
7.3
|
0
|
0
|
0
|
0
|
0
|
0
|
22
|
100
|
0
|
0
|
25-29
|
36
|
11.9
|
1
|
2.8
|
35
|
97.2
|
0
|
0
|
36
|
100
|
0
|
0
|
30-34
|
46
|
15.2
|
3
|
6.5
|
43
|
93.5
|
0
|
0
|
46
|
100
|
0
|
0
|
35-39
|
61
|
20.2
|
5
|
8.2
|
56
|
91.8
|
1
|
1.6
|
60
|
98.4
|
1
|
1.6
|
40-44
|
43
|
14.3
|
3
|
7.0
|
40
|
93
|
2
|
4.7
|
41
|
95.3
|
1
|
2.3
|
45-49
|
42
|
13.9
|
7
|
16.7
|
35
|
83.3
|
2
|
4.8
|
40
|
95.2
|
2
|
4.8
|
50-55
|
52
|
17.2
|
7
|
13.5
|
45
|
86.5
|
6
|
11.5
|
46
|
88.5
|
2
|
3.8
|
X
2
= 14.141; p =0.028*
|
X
2
= 14.141; p =0.028*
|
Imaging
Abnormality | No. of subjects | |
---|---|---|
Dominant shoulder
| Alteration of tendon structure | 19 supraspinatus, 18 infraspinatus, 5 subscapularis, 2 LHBT |
Tendinopathy | 10 supraspinatus, 15 infraspinatus, 4 subscapularis, 1 LHBT | |
Partial tendon tear | 1 supraspinatus | |
Granular calcification | 1 supraspinatus, 4 infraspinatus, 1 subscapularis | |
Milk calcification | 2 infraspinatus | |
Linear calcification | 12 supraspinatus, 6 infraspinatus, 4 subscapularis | |
Humeral head geodes | 10 subjects | |
Hill Sachs | 2 subjects | |
AC joint arthrosis | 3 subjects | |
Non-dominant shoulder
| Alteration of tendon structure | 14 supraspinatus, 16 infraspinatus, 6 subscapularis, 1 LHBT |
Tendinopathy | 13 supraspinatus, 13 infraspinatus, 5 subscapularis | |
Full tendon tear | 1 supraspinatus, 1 subscapularis | |
Partial tendon tear | 1 supraspinatus | |
Subluxation | 1 subject | |
Granular calcification | 3 supraspinatus, 4 infraspinatus | |
Linear calcification | 7 supraspinatus, 7 infraspinatus, 6 subscapularis | |
Humeral head geodes | 8 subjects | |
Hill Sachs | 1 subject | |
AC joint arthrosis | 3 subjects | |
Bone spur | 1 subject |
Age | Dominant arm | Non-dominant arm | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Abnormal | Normal | Abnormal | Normal | |||||||
Yrs | No. |
%
| No. |
%
| No. |
%
| No. |
%
| No. |
%
|
20-24
|
22
|
7.3
|
0
|
0
|
22
|
100
|
0
|
0
|
22
|
100
|
25-29
|
36
|
11.9
|
2
|
5.6
|
34
|
94.4
|
0
|
0
|
36
|
100
|
30-34
|
46
|
15.2
|
1
|
2.2
|
45
|
97.8
|
1
|
2.2
|
45
|
97.8
|
35-39
|
61
|
20.2
|
3
|
4.9
|
58
|
95.1
|
1
|
1.6
|
60
|
98.4
|
40-44
|
43
|
14.3
|
1
|
2.3
|
42
|
97.7
|
0
|
0
|
43
|
100
|
45-49
|
42
|
13.9
|
7
|
16.7
|
35
|
83.3
|
6
|
14.3
|
36
|
85.7
|
50-55
|
52
|
17.2
|
8
|
15.4
|
44
|
84.6
|
10
|
19.2
|
42
|
80.8
|
X
2
= 16.263; p = 0.012*
|
X
2
= 31.142; p = 0.001*
|
Dominant arm | Non dominant arm | ||||
---|---|---|---|---|---|
No. | % | No. | % | ||
Abnormal imaging findings | Clinically abnormal | 4 | 1.3 | 3 | 1.0 |
Symptomatic | |||||
Clinically abnormal | 1 | 0.3 | 2 | 0.7 | |
Asymptomatic | |||||
Clinically normal | 8 | 2.6 | 5 | 1.7 | |
Symptomatic | |||||
Clinically normal | 9 | 3.0 | 8 | 2.6 | |
Asymptomatic | |||||
Normal imaging findings | Clinically normal | 224 | 74.2 | 251 | 83.1 |
Asymptomatic | |||||
Clinically abnormal | 13 | 4.3 | 3 | 1.0 | |
Symptomatic | |||||
Clinically normal | 35 | 11.6 | 27 | 8.9 | |
Symptomatic | |||||
Clinically abnormal | 8 | 2.6 | 3 | 1.0 | |
Asymptomatic |