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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 using two methods of calculation. 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)) were measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using two methods of calculation (with respect (w/r) to the trunk and with respect (w/r) to the scapula at rest) in healthy subjects (n = 30 shoulders). The intersession ICCs were also measured using the mean of the three trials of each session (Trial 1-2-3) and the mean of the two first trials of each session (Trial 1–2). The error bar represents the 95% confidence interval of the ICCs.
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Figure 3: Intersession intraclass correlation coefficients of 3D scapular attitudes using two methods of calculation. 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)) were measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using two methods of calculation (with respect (w/r) to the trunk and with respect (w/r) to the scapula at rest) in healthy subjects (n = 30 shoulders). The intersession ICCs were also measured using the mean of the three trials of each session (Trial 1-2-3) and the mean of the two first trials of each session (Trial 1–2). The error bar represents the 95% confidence interval of the ICCs.

Mentions: The level of reliability obtained when using two different methods of calculation of relative movement was assessed for the healthy subjects. Within the same session, reliability of both methods was good to very good (ICCs from 0.73 to 0.96 with 95%CI from 0.50 to 0.99 and SEM from 0.9° to 2.4° with 95%CI from 0.7° to 3.2°). Generally, the levels of between sessions reliability seemed better when using the method of calculation relative to the trunk (ICCs from 0.62 to 0.90 with 95%CI from 0.34 to 0.95 and SEM from 1.5° to 4.2° with 95%CI from 1.2° to 5.7° with the method relative to the trunk compared to ICCs from 0.23 to 0.91 with 95%CI from -0.13 to 0.95 and SEM from 1.7° to 4.5° with 95%CI from 1.4° to 6.0° with the method relative to the scapula at rest). However, the reliability was only significantly higher with the method of calculation relative to the trunk in A-PT at 70° of flexion for the ICCs and the SEM and in A-PT at 90° of abduction for the ICCs (Figure 3 and 4).


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 using two methods of calculation. 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)) were measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using two methods of calculation (with respect (w/r) to the trunk and with respect (w/r) to the scapula at rest) in healthy subjects (n = 30 shoulders). The intersession ICCs were also measured using the mean of the three trials of each session (Trial 1-2-3) and the mean of the two first trials of each session (Trial 1–2). The error bar represents the 95% confidence interval of the ICCs.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: Intersession intraclass correlation coefficients of 3D scapular attitudes using two methods of calculation. 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)) were measured in three static shoulder positions (arm at rest, 70° of flexion, 90° of abduction) using two methods of calculation (with respect (w/r) to the trunk and with respect (w/r) to the scapula at rest) in healthy subjects (n = 30 shoulders). The intersession ICCs were also measured using the mean of the three trials of each session (Trial 1-2-3) and the mean of the two first trials of each session (Trial 1–2). The error bar represents the 95% confidence interval of the ICCs.
Mentions: The level of reliability obtained when using two different methods of calculation of relative movement was assessed for the healthy subjects. Within the same session, reliability of both methods was good to very good (ICCs from 0.73 to 0.96 with 95%CI from 0.50 to 0.99 and SEM from 0.9° to 2.4° with 95%CI from 0.7° to 3.2°). Generally, the levels of between sessions reliability seemed better when using the method of calculation relative to the trunk (ICCs from 0.62 to 0.90 with 95%CI from 0.34 to 0.95 and SEM from 1.5° to 4.2° with 95%CI from 1.2° to 5.7° with the method relative to the trunk compared to ICCs from 0.23 to 0.91 with 95%CI from -0.13 to 0.95 and SEM from 1.7° to 4.5° with 95%CI from 1.4° to 6.0° with the method relative to the scapula at rest). However, the reliability was only significantly higher with the method of calculation relative to the trunk in A-PT at 70° of flexion for the ICCs and the SEM and in A-PT at 90° of abduction for the ICCs (Figure 3 and 4).

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