The scapular assistance test results in changes in scapular position and subacromial space but not rotator cuff strength in subacromial impingement

Amee L. Seitz, Philip W. McClure, Sheryl Finucane, Jessica M. Ketchum, Matthew K. Walsworth, N. Douglas Boardman, Lori A. Michener

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

STUDY DESIGN: Controlled laboratory study. OBJECTIVES: To determine the effect of the modified scapular assistance test (SAT) on 3-dimensional shoulder kinematics, strength, and linear measures of subacromial space in patients with subacromial impingement syndrome (SAIS). TTBACKGROUND: Abnormal scapular kinematics have been identified in patients with SAIS. Increased scapular upward rotation and posterior tilt, as induced with manual assistance using the SAT, have been theorized to increase subacromial space and may alter shoulder strength. METHODS: Forty-two subjects (21 with SAIS and 21 controls) participated in this study. The anterior outlet of the subacromial space, measured via the acromiohumeral distance on ultrasound images, and 3-dimensional scapular kinematics, measured using motion analysis, were determined with the arm at rest, and at 45° and 90° of active elevation with and without the SAT. A dynamometer was used to measure isometric shoulder strength. Full factorial mixed-model analyses of variance evaluated the effects of the SAT on variables between groups. RESULTS: There was an increase in scapular posterior tilt at all angles, upward rotation at rest and 45° of elevation, and acromiohumeral distance at 45° and at 90° with the SAT. The SAT did not alter normalized isometric strength. There were no differences in response to the SAT between the SAIS and control groups. CONCLUSIONS: Manual scapular assistance using the SAT influences factors associated with SAIS, such as subacromial space and potentially scapular orientation during static arm elevation, but not more so in individuals with SAIS than in healthy individuals. The SAT performed statically may be a way to identify potential subgroups of individuals with SAIS for whom subacromial space narrowing may be a contributing factor.

Original languageEnglish (US)
Pages (from-to)400-412
Number of pages13
JournalJournal of Orthopaedic and Sports Physical Therapy
Volume42
Issue number5
DOIs
StatePublished - May 2012

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Shoulder Impingement Syndrome
Rotator Cuff
Biomechanical Phenomena
Arm
Analysis of Variance
Control Groups

Keywords

  • Acromiohumeral distance
  • Examination
  • Rotator cuff disease
  • Shoulder
  • Ultrasound imaging

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

The scapular assistance test results in changes in scapular position and subacromial space but not rotator cuff strength in subacromial impingement. / Seitz, Amee L.; McClure, Philip W.; Finucane, Sheryl; Ketchum, Jessica M.; Walsworth, Matthew K.; Douglas Boardman, N.; Michener, Lori A.

In: Journal of Orthopaedic and Sports Physical Therapy, Vol. 42, No. 5, 05.2012, p. 400-412.

Research output: Contribution to journalArticle

Seitz, Amee L. ; McClure, Philip W. ; Finucane, Sheryl ; Ketchum, Jessica M. ; Walsworth, Matthew K. ; Douglas Boardman, N. ; Michener, Lori A. / The scapular assistance test results in changes in scapular position and subacromial space but not rotator cuff strength in subacromial impingement. In: Journal of Orthopaedic and Sports Physical Therapy. 2012 ; Vol. 42, No. 5. pp. 400-412.
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abstract = "STUDY DESIGN: Controlled laboratory study. OBJECTIVES: To determine the effect of the modified scapular assistance test (SAT) on 3-dimensional shoulder kinematics, strength, and linear measures of subacromial space in patients with subacromial impingement syndrome (SAIS). TTBACKGROUND: Abnormal scapular kinematics have been identified in patients with SAIS. Increased scapular upward rotation and posterior tilt, as induced with manual assistance using the SAT, have been theorized to increase subacromial space and may alter shoulder strength. METHODS: Forty-two subjects (21 with SAIS and 21 controls) participated in this study. The anterior outlet of the subacromial space, measured via the acromiohumeral distance on ultrasound images, and 3-dimensional scapular kinematics, measured using motion analysis, were determined with the arm at rest, and at 45° and 90° of active elevation with and without the SAT. A dynamometer was used to measure isometric shoulder strength. Full factorial mixed-model analyses of variance evaluated the effects of the SAT on variables between groups. RESULTS: There was an increase in scapular posterior tilt at all angles, upward rotation at rest and 45° of elevation, and acromiohumeral distance at 45° and at 90° with the SAT. The SAT did not alter normalized isometric strength. There were no differences in response to the SAT between the SAIS and control groups. CONCLUSIONS: Manual scapular assistance using the SAT influences factors associated with SAIS, such as subacromial space and potentially scapular orientation during static arm elevation, but not more so in individuals with SAIS than in healthy individuals. The SAT performed statically may be a way to identify potential subgroups of individuals with SAIS for whom subacromial space narrowing may be a contributing factor.",
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AU - Finucane, Sheryl

AU - Ketchum, Jessica M.

AU - Walsworth, Matthew K.

AU - Douglas Boardman, N.

AU - Michener, Lori A.

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