Contact forces in the subacromial space: Effects of scapular orientation

Karduna, Andrew R.; Kerner, Paul J.; Lazarus, Mark D.

doi:10.1016/j.jse.2004.09.001

Cited by 82 publications

(60 citation statements)

References 32 publications

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“…This finding goes against previous theories, which describe increased clearance with increased scapular upward rotation. 9,24,29 Our study does not agree with the current in vivo theory or the findings of the cadaver study; however, Karduna et al 28 examined this in cadavers with simulated muscle activation of the rotator cuff and deltoid. The effect of muscle contraction or at minimum baseline muscle tone may play a large part in this relationship.…”

Section: Discussioncontrasting

confidence: 74%

“…8,9,19 One study has examined subacromial clearance through the use of contact forces in cadaver shoulders and the effect of scapular motion on subacromial clearance. 28 Those researchers found that the subacromial clearance was decreased as scapular upward rotation was increased. This finding goes against previous theories, which describe increased clearance with increased scapular upward rotation.…”

Section: Discussionmentioning

confidence: 99%

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Assessment of Subacromial Space and Its Relationship With Scapular Upward Rotation in College Baseball Players

Thomas

Swanik²,

Kaminski³

et al. 2013

Journal of Sport Rehabilitation

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Context:Subacromial impingement is a common injury in baseball players and has been linked to a reduction in the subacromial space. In addition, it has been suggested that decreases in scapular upward rotation will lead to decreases in the subacromial space and ultimately impingement syndrome.Objective:The objective of this study was to evaluate the relationship between acromiohumeral distance and scapular upward rotation in healthy college baseball players.Design:Posttest-only study design.Setting:Controlled laboratory setting.Participants:24 healthy college baseball players.Intervention:Participants were measured for all dependent variables at preseason.Main Outcome Measures:Acromiohumeral distance at rest and 90° of abduction was measured with a diagnostic ultrasound unit. Scapular upward rotation at rest and 90° of abduction was measured with a digital inclinometer.Results:Dominant-arm acromiohumeral distance at rest and 90° of abduction (P = .694, P = .840) was not significantly different than in the nondominant arm. In addition, there was not a significant correlation between acromiohumeral distance and scapular upward rotation at rest and 90° of abduction for either the dominant or the nondominant arm.Conclusions:These results indicate that the acromiohumeral distance is not adapting in the dominant arm in healthy throwing athletes. In addition, a relationship was not identified between acromiohumeral distance and scapular upward rotation, which was previously suggested. These results may suggest that changes that are typically seen in an injured population may be occurring due to the injury and are not preexisting. In addition, scapular upward rotation may not be the only contributing factor to acromiohumeral distance.

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Section: Discussioncontrasting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Assessment of Subacromial Space and Its Relationship With Scapular Upward Rotation in College Baseball Players

Thomas

Swanik²,

Kaminski³

et al. 2013

Journal of Sport Rehabilitation

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“…From a physiological perspective, in addition to maximizing ROM, increased scapular upward rotation would seem to be protective with regard to maximizing the subacromial space and reducing risk for subacromial impingement. 12,21 However, in a cadaveric analysis, Karduna et al 17 were not able to support a premise of increased clearance for humeral head superior translations in positions of increased scapular upward rotation. Further study is needed with regard to how scapular kinematic alterations impact the subacromial space and rotator cuff clearance during elevation of the arm.…”

Section: Nonimpaired Noninvolvedmentioning

confidence: 98%

Alterations in Scapular Kinematics in Subjects With Idiopathic Loss of Shoulder Range of Motion

Rundquist

2007

J Orthop Sports Phys Ther

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Etiologic investigations have focused primarily on the glenohumeral joint. Proposed etiologies include decreased capsular volume, 20,33 degenerative changes, 2,47 shoulder capsule adhesions, 1,30,31 synovitis, 14,46,47 and thickened synovium. 11,24These etiologic investigations have led to multiple alternative labels proposed in the literature. The most frequently cited are adhesive capsulitis and frozen shoulder. These labels are essentially interchangeable with idiopathic loss of shoulder ROM. Subjects with idiopathic loss of shoulder ROM consistently report decreased motion in multiple planes. 7,15,41 Frequent functional complaints include difficulty getting dressed, completing personal hygiene, 29 and performing tasks requiring overhead reaching. 15 Performance of these activities of daily living requires the combined and coordinated motions of the scapulothoracic and glenohumeral joints.The scapula links the humerus to the trunk. Scapulothoracic motion is necessary to achieve full humerus-to-trunk scapular plane elevation. Cathcart 6 was the first to recognize the scapulothoracic contribution to normal shoulder complex kinematics. He determined that the scapula moved on the thorax throughout humerus elevation. Many terms have been utilized to describe the movement of the scapula on the thorax. For consistency, this article will use terminology presented by Ludewig et al. 22 Upward/downward rotation occurs around an axis perpendicular to the plane of the scapula. Posterior/anterior tipping occurs around an axis approximately parallel to the spine of the scapula. Internal/external rotation occurs around a vertical axis.Scapular motion on the thorax dur-PETER J. RUNDQUIST, PT, PhD The condition affects 3% of the population. 32 Despite several authors' reports that the condition spontaneously resolves within 2 years, 7,13 subjects continue to report shoulder pain, stiffness, or both for up to 7 years. MATERIALS AND METHODS:Seventeen unilaterally impaired and 17 nonimpaired subjects. The 3-dimensional motion of the humerus, scapula, and trunk were measured with the Fastrak electromagnetic motion-tracking system during humerus-to-trunk scapular plane elevation. An analysis of variance compared the impaired subjects noninvolved to the nonimpaired subjects' scapulae at 4 scapular plane elevation positions. A repeated-measures analysis of variance compared the impaired subjects' involved and noninvolved scapulae at 3 scapular plane elevation positions, and matched-pairs t test compared peak elevation values. RESULTS:The between-group ANOVAs demonstrated no difference in anterior tipping, internal rotation, or upward rotation. The repeated-measures ANOVAs demonstrated no difference in anterior tipping or internal rotation and a position-by-side interaction in upward rotation. The involved-side scapulae were more upwardly rotated (7.7°) at peak humerus-to-trunk scapular plane elevation. DISCUSSION AND CONCLUSION:The impaired subjects' noninvolved scapular kinematics were not significantly different than the nonimpair...

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“…No biomechanical study investigating the effects of commonly used gliding techniques on GH joint three dimensional (3D) biomechanics are currently known (Nicholson, 1985;Hsu and Headman., 2002;Karduna et al, 2005;Johnson et al, 2007;Lin et al, 2008;Ho et al 2009;Kelley et al, 2009;McQuade et al, 2012). The objectives of this study were to develop an in vitro protocol to determine the 3D biomechanical effects of joint mobilization on the GH joint, and to then simulate these mobilizations.…”

Section: List Of Tablesmentioning

confidence: 99%

“…Glenohumeral joint hypomobility can contribute directly (adhesive capsulitis) or indirectly (shoulder impingement syndrome) to shoulder pain and immobility (Kelley et al, 2009;Wilk et al, 2009;Brudvig et al, 2011). Physical therapists (PTs) use joint mobilization techniques as the intervention of choice to address capsular hypomobility (Maitland, 1977;Rollins et al, 1980;Donatelli and Greenfield., 1987;Vermeulen et al, 2000;Karduna et al, 2005;Vermeulen et al, 2006). Manual shoulder joint mobilizations are often incorporated to restore restricted arthrokinematic motions that can restrict osteokinematic motion.…”

Section: Introductionmentioning

confidence: 99%

In Vitro Manual Therapy and Biorobotic Simulation of Glenohumeral Joint Mobilization Techniques

Smith¹

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Contact forces in the subacromial space: Effects of scapular orientation

Cited by 82 publications

References 32 publications

Assessment of Subacromial Space and Its Relationship With Scapular Upward Rotation in College Baseball Players

Assessment of Subacromial Space and Its Relationship With Scapular Upward Rotation in College Baseball Players

Alterations in Scapular Kinematics in Subjects With Idiopathic Loss of Shoulder Range of Motion

In Vitro Manual Therapy and Biorobotic Simulation of Glenohumeral Joint Mobilization Techniques

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