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The reliability of three-dimensional scapular attitudes in healthy people and people with shoulder impingement syndrome.

Roy JS, Moffet H, Hébert LJ, St-Vincent G, McFadyen BJ - BMC Musculoskelet Disord (2007)

Bottom Line: Three-dimensional scapular attitudes were measured twice (test and retest interspaced by one week) on fifteen healthy subjects (mean age 37.3 years) and eight subjects with subacromial shoulder impingement syndrome (mean age 46.1 years) in three arm positions (arm at rest, 70 degrees of humerothoracic flexion and 90 degrees of humerothoracic abduction) using the Optotrak Probing System.Intraclass correlation coefficient (ICC) and standard error of measure (SEM) were used to estimate intra and intersession reliability.Higher levels of intersession reliability were found for the method of calculation relative to the trunk in anterior-posterior tilting at 70 degrees of flexion compared to the method of calculation relative to the scapula at rest.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Quebec, Canada. jean-sebastien.roy.1@ulaval.ca

ABSTRACT

Background: Abnormal scapular displacements during arm elevation have been observed in people with shoulder impingement syndrome. These abnormal scapular displacements were evaluated using different methods and instruments allowing a 3-dimensional representation of the scapular kinematics. The validity and the intrasession reliability have been shown for the majority of these methods for healthy people. However, the intersession reliability on healthy people and people with impaired shoulders is not well documented. This measurement property needs to be assessed before using such methods in longitudinal comparative studies. The objective of this study is to evaluate the intra and intersession reliability of 3-dimensional scapular attitudes measured at different arm positions in healthy people and to explore the same measurement properties in people with shoulder impingement syndrome using the Optotrak Probing System.

Methods: Three-dimensional scapular attitudes were measured twice (test and retest interspaced by one week) on fifteen healthy subjects (mean age 37.3 years) and eight subjects with subacromial shoulder impingement syndrome (mean age 46.1 years) in three arm positions (arm at rest, 70 degrees of humerothoracic flexion and 90 degrees of humerothoracic abduction) using the Optotrak Probing System. Two different methods of calculation of 3-dimensional scapular attitudes were used: relative to the position of the scapula at rest and relative to the trunk. Intraclass correlation coefficient (ICC) and standard error of measure (SEM) were used to estimate intra and intersession reliability.

Results: For both groups, the reliability of the three-dimensional scapular attitudes for elevation positions was very good during the same session (ICCs from 0.84 to 0.99; SEM from 0.6 degrees to 1.9 degrees ) and good to very good between sessions (ICCs from 0.62 to 0.97; SEM from 1.2 degrees to 4.2 degrees ) when using the method of calculation relative to the trunk. Higher levels of intersession reliability were found for the method of calculation relative to the trunk in anterior-posterior tilting at 70 degrees of flexion compared to the method of calculation relative to the scapula at rest.

Conclusion: The estimation of three-dimensional scapular attitudes using the method of calculation relative to the trunk is reproducible in the three arm positions evaluated and can be used to document the scapular behavior.

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Related in: MedlinePlus

Intersession intraclass correlation coefficients of 3D scapular attitudes for the two populations. The intersession intraclass correlation coefficients (ICCs) of 3D scapular attitudes (anterior/posterior tilting (A-PT), lateral/medial rotation (L-MR) and protraction/retraction (PRO-RET)) was measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using the method of calculation relative to the trunk in healthy subjects (n = 30 shoulders) and subjects with SIS (n = 8 shoulders for impaired shoulders and non-impaired shoulders).
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Figure 5: Intersession intraclass correlation coefficients of 3D scapular attitudes for the two populations. The intersession intraclass correlation coefficients (ICCs) of 3D scapular attitudes (anterior/posterior tilting (A-PT), lateral/medial rotation (L-MR) and protraction/retraction (PRO-RET)) was measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using the method of calculation relative to the trunk in healthy subjects (n = 30 shoulders) and subjects with SIS (n = 8 shoulders for impaired shoulders and non-impaired shoulders).

Mentions: For the subjects with SIS, the intersession reliability for the arm at rest condition was good to very good for the three rotations (ICCs from 0.74 to 0.95 with 95%CI from 0.18 to 0.99, SEM from 0.7° to 2.8° with 95%CI from 0.5° to 5.6°). For the SIS shoulders alone (n = 8 shoulders), the reliability was good to very good in flexion and abduction (ICC from 0.73 to 0.97 with 95%CI from 0.17 to 0.99, SEM from 1.3° to 2.9° with 95%CI from 0.9° to 5.8°) (Figure 5 and Table 3). For the non-impaired shoulder alone, in flexion and abduction, the reliability was very good for all rotations (ICCs from 0.84 to 0.95 with 95%CI from 0.45 to 0.99, SEM from 1.2° to 2.7° with 95%CI from 0.8° to 5.6°) (Figure 5 and Table 3). Compared to the healthy subjects, significantly higher levels of reliability were found in the impaired shoulder of subjects with SIS in PRO-RET at 70° of flexion for the ICCs and the SEM and in PRO-RET at 90° of abduction for the ICCs. Significantly higher levels of reliability were also found in the non-impaired shoulder of subjects with SIS compared to healthy subjects for the SEM in L-MR with the arm at rest and in PRO-RET at 70° of flexion. There were no significant differences (p < 0.05) in the SPADI score between the two sessions (Table 1).


The reliability of three-dimensional scapular attitudes in healthy people and people with shoulder impingement syndrome.

Roy JS, Moffet H, Hébert LJ, St-Vincent G, McFadyen BJ - BMC Musculoskelet Disord (2007)

Intersession intraclass correlation coefficients of 3D scapular attitudes for the two populations. The intersession intraclass correlation coefficients (ICCs) of 3D scapular attitudes (anterior/posterior tilting (A-PT), lateral/medial rotation (L-MR) and protraction/retraction (PRO-RET)) was measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using the method of calculation relative to the trunk in healthy subjects (n = 30 shoulders) and subjects with SIS (n = 8 shoulders for impaired shoulders and non-impaired shoulders).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC1919363&req=5

Figure 5: Intersession intraclass correlation coefficients of 3D scapular attitudes for the two populations. The intersession intraclass correlation coefficients (ICCs) of 3D scapular attitudes (anterior/posterior tilting (A-PT), lateral/medial rotation (L-MR) and protraction/retraction (PRO-RET)) was measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using the method of calculation relative to the trunk in healthy subjects (n = 30 shoulders) and subjects with SIS (n = 8 shoulders for impaired shoulders and non-impaired shoulders).
Mentions: For the subjects with SIS, the intersession reliability for the arm at rest condition was good to very good for the three rotations (ICCs from 0.74 to 0.95 with 95%CI from 0.18 to 0.99, SEM from 0.7° to 2.8° with 95%CI from 0.5° to 5.6°). For the SIS shoulders alone (n = 8 shoulders), the reliability was good to very good in flexion and abduction (ICC from 0.73 to 0.97 with 95%CI from 0.17 to 0.99, SEM from 1.3° to 2.9° with 95%CI from 0.9° to 5.8°) (Figure 5 and Table 3). For the non-impaired shoulder alone, in flexion and abduction, the reliability was very good for all rotations (ICCs from 0.84 to 0.95 with 95%CI from 0.45 to 0.99, SEM from 1.2° to 2.7° with 95%CI from 0.8° to 5.6°) (Figure 5 and Table 3). Compared to the healthy subjects, significantly higher levels of reliability were found in the impaired shoulder of subjects with SIS in PRO-RET at 70° of flexion for the ICCs and the SEM and in PRO-RET at 90° of abduction for the ICCs. Significantly higher levels of reliability were also found in the non-impaired shoulder of subjects with SIS compared to healthy subjects for the SEM in L-MR with the arm at rest and in PRO-RET at 70° of flexion. There were no significant differences (p < 0.05) in the SPADI score between the two sessions (Table 1).

Bottom Line: Three-dimensional scapular attitudes were measured twice (test and retest interspaced by one week) on fifteen healthy subjects (mean age 37.3 years) and eight subjects with subacromial shoulder impingement syndrome (mean age 46.1 years) in three arm positions (arm at rest, 70 degrees of humerothoracic flexion and 90 degrees of humerothoracic abduction) using the Optotrak Probing System.Intraclass correlation coefficient (ICC) and standard error of measure (SEM) were used to estimate intra and intersession reliability.Higher levels of intersession reliability were found for the method of calculation relative to the trunk in anterior-posterior tilting at 70 degrees of flexion compared to the method of calculation relative to the scapula at rest.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Quebec, Canada. jean-sebastien.roy.1@ulaval.ca

ABSTRACT

Background: Abnormal scapular displacements during arm elevation have been observed in people with shoulder impingement syndrome. These abnormal scapular displacements were evaluated using different methods and instruments allowing a 3-dimensional representation of the scapular kinematics. The validity and the intrasession reliability have been shown for the majority of these methods for healthy people. However, the intersession reliability on healthy people and people with impaired shoulders is not well documented. This measurement property needs to be assessed before using such methods in longitudinal comparative studies. The objective of this study is to evaluate the intra and intersession reliability of 3-dimensional scapular attitudes measured at different arm positions in healthy people and to explore the same measurement properties in people with shoulder impingement syndrome using the Optotrak Probing System.

Methods: Three-dimensional scapular attitudes were measured twice (test and retest interspaced by one week) on fifteen healthy subjects (mean age 37.3 years) and eight subjects with subacromial shoulder impingement syndrome (mean age 46.1 years) in three arm positions (arm at rest, 70 degrees of humerothoracic flexion and 90 degrees of humerothoracic abduction) using the Optotrak Probing System. Two different methods of calculation of 3-dimensional scapular attitudes were used: relative to the position of the scapula at rest and relative to the trunk. Intraclass correlation coefficient (ICC) and standard error of measure (SEM) were used to estimate intra and intersession reliability.

Results: For both groups, the reliability of the three-dimensional scapular attitudes for elevation positions was very good during the same session (ICCs from 0.84 to 0.99; SEM from 0.6 degrees to 1.9 degrees ) and good to very good between sessions (ICCs from 0.62 to 0.97; SEM from 1.2 degrees to 4.2 degrees ) when using the method of calculation relative to the trunk. Higher levels of intersession reliability were found for the method of calculation relative to the trunk in anterior-posterior tilting at 70 degrees of flexion compared to the method of calculation relative to the scapula at rest.

Conclusion: The estimation of three-dimensional scapular attitudes using the method of calculation relative to the trunk is reproducible in the three arm positions evaluated and can be used to document the scapular behavior.

Show MeSH
Related in: MedlinePlus