Differences in scapular orientation, subacromial space and shoulder pain between the full can and empty can tests

Timmons, Mark K.; Lopes-Albers, Andrea Diniz; Borgsmiller, Lindsey; Zirker, Catherine; Ericksen, Jeff; Michener, Lori A.

doi:10.1016/j.clinbiomech.2013.01.015

Cited by 15 publications

(9 citation statements)

References 36 publications

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“…For example, despite quantifying acromiohumeral distances in the same position (axial rotation in 90 • of humerothoracic elevation), Longo et al reported humeral external rotation significantly increased the acromiohumeral distance, 34 while Graichen et al 40 reported the distance significantly decreased, 40 and Timmons et al reported no significant change. 43 Additionally, humeral internal rotation has been shown to increase 40 and have no effect 31,42 on acromiohumeral distances. Several factors may help explain these conflicting results.…”

Section: Effect Of Humeral Axial Rotation On Subacromial Proximitiesmentioning

confidence: 99%

Shoulder kinematics impact subacromial proximities: a review of the literature

Lawrence

Braman

Ludewig

2020

Brazilian Journal of Physical Therapy

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Background: Alterations in glenohumeral and scapulothoracic kinematics have been theorized to contribute to rotator cuff pathology by impacting the magnitude of the subacromial space. Objective: The purpose of this review is to summarize what is currently known about the relationship between shoulder kinematics and subacromial proximities. Conclusions: A variety of methods have been used to quantify subacromial proximities including photographs, MR imaging, ultrasonography, and single-and bi-plane radiographs. Changes in glenohumeral and scapulothoracic kinematics are associated with changes in subacromial proximities. However, the magnitude and direction of a particular motion's impact on subacromial proximities often vary between studies, which likely reflects different methodologies and subject populations. Glenohumeral elevation angle has been consistently found to impact subacromial proximities. Plane of humeral elevation also impacts subacromial proximities but to a lesser degree than the elevation angle. The impact of decreased scapulothoracic upward rotation on subacromial proximities is not absolute, but instead depends on the angle of humerothoracic elevation. The effects of scapular dyskinesis and humeral and scapular axial rotations on subacromial proximities are less clear. Future research is needed to further investigate the relationship between kinematics and subacromial proximities using more homogenous groups, determine the extent to which compression and other factors contribute to rotator cuff pathology, and develop accurate and reliable clinical measures of shoulder motion.

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Section: Effect Of Humeral Axial Rotation On Subacromial Proximitiesmentioning

confidence: 99%

Shoulder kinematics impact subacromial proximities: a review of the literature

Lawrence

Braman

Ludewig

2020

Brazilian Journal of Physical Therapy

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“…Differences in the shoulder joint angle were reported between the full can test, thumb up position and the empty can test, thumb down position. In particular, Timmons reported that the full can test led to external rotation of the shoulder joint in contrast to the empty can test [Timmons et al, 2013]. Muscle activation of the posterior deltoid during the empty can test, which is done with the shoulder internally rotated, was higher than that during the full can test [Reinold et al, 2007].…”

Section: Discussionmentioning

confidence: 99%

Comparative study of the differences in shoulder muscle activation according to arm rotation angle

Ijiri

Urabe

Maeda

et al. 2020

Human Movement Science

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Background: Scapular muscle exercise is important for patients with shoulder disorders. Distal variance leads to changes in shoulder muscle activation. Here, we aimed to determine whether scapular muscle activation is affected by different arm rotation angles. Methods: Overall, 30 healthy men participated in this study. The subjects were asked to keep their arms at 120 degrees of shoulder flexion while holding a 1.0-kg dumbbell in palms down (pronation) and palms up (supination) positions. Electromyography was used to measure anterior, middle, posterior deltoid, serratus anterior, upper, and lower trapezius muscle activation during the task. The muscle activations of each shoulder were compared between the pronation and supination positions. Results: Anterior deltoid and serratus anterior activations were significantly higher in supination than in pronation (p < .05). Alternatively, posterior deltoid and lower trapezius muscles were significantly more activated in pronation than in supination (p < .05). Conclusion: Scapular muscle activation changed with arm rotation angle. Arm rotation angle should be assessed to estimate scapular muscle activation during exercise and motion analysis in clinical practice.

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“…Third, motion was applied at the humerus with real-time evaluation of impingement, and the minimum humeroacromial distance was measured. 12 , 31 , 57 A color scale was also used to map the variations of humeroacromial distance on the scapular surface ( Fig. 1 , D ).…”

Section: Methodsmentioning

confidence: 99%

Acromioplasty during repair of rotator cuff tears removes only half of the impinging acromial bone

et al. 2020

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Background To date, there is no consensus on when and how to perform acromioplasty during rotator cuff repair (RCR). We aimed to determine the volume of impinging bone removed during acromioplasty and whether it influences postoperative range of motion (ROM) and clinical scores after RCR. Methods Preoperative and postoperative computed tomography scans of 57 shoulders that underwent RCR were used to reconstruct scapula models to simulate volumes of impinging acromial bone preoperatively and then compare them to the volumes of bone resected postoperatively to calculate the proportions of desired (ideal) vs. unnecessary (excess) resections. All patients were evaluated preoperatively and at 6 months to assess ROM and functional scores. Results The volume of impinging bone identified was 3.5 ± 2.3 cm 3 , of which 1.6 ± 1.2 cm 3 (50% ± 27%) was removed during acromioplasty. The volume of impinging bone identified was not correlated with preoperative critical shoulder angle ( r = 0.025, P = .853), nor with glenoid inclination ( r = −0.024, P = .857). The volume of bone removed was 3.7 ± 2.2 cm 3 , of which 2.1 ± 1.6 cm 3 (53% ± 24%) were unnecessary resections. Multivariable analyses revealed that more extensive removal of impinging bone significantly improved internal rotation with the arm at 90° of abduction (beta, 27.5, P = .048) but did not affect other shoulder movements or clinical scores. Conclusions Acromioplasty removed only 50% of the estimated volume of impinging acromial bone. More extensive removal of impinging bone significantly improved internal rotation with the arm at 90° of abduction.

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Differences in scapular orientation, subacromial space and shoulder pain between the full can and empty can tests

Cited by 15 publications

References 36 publications

Shoulder kinematics impact subacromial proximities: a review of the literature

Shoulder kinematics impact subacromial proximities: a review of the literature

Comparative study of the differences in shoulder muscle activation according to arm rotation angle

Acromioplasty during repair of rotator cuff tears removes only half of the impinging acromial bone

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