The human glenohumeral joint

Nyland, John; Caborn, David N.M.; Johnson, Darren L.

doi:10.1007/s001670050072

Cited by 39 publications

(3 citation statements)

References 26 publications

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“…At extreme positions of the motion, ligaments and muscles would prevent shoulder joint luxation. Following the development of multidirectional instability, changes in the activity of the neuromuscular system—brought about by learning or reflexes—hinder the development of luxation or subluxation [1, 2, 5, 30]. Altered kinematic characteristics should be associated with an altered motion pattern and modified muscle activity.…”

Section: Discussionmentioning

confidence: 99%

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Kinematic and muscle activity characteristics of multidirectional shoulder joint instability during elevation

Illyés

Kiss²

2005

Knee Surg Sports Traumatol Arthr

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Alterations of shoulder motion have been suggested to be associated with shoulder disorders. The objective of this study was to perform a 3D motion analysis (kinematic and electromyographical) of skeletal elements and muscles of shoulder joint in patients with multidirectional instability. Fifteen patients with multidirectional instability and 15 normal controls were investigated during continuous elevation in the scapular plane. The spatial coordinates of 16 anatomical points of the shoulder to determine kinematical parameters were quantified by an ultrasound-based motion analyzer. The activities of 12 muscles were measured by surface electromyography. Kinematic characteristics of motion were identified by scapulothoracic, glenohumeral, and humeral elevation angles; range of angles; scapulothoracic and glenohumeral rhythm; scapulothoracis, glenohumeral, and scapuloglenoid ratios; and the relative displacement between the rotation centers of the humerus and the scapula. The electromyographical characteristics of motion were modeled by the on-off pattern of muscle activity. Significant alterations in kinematical parameters were observed between patients and asymptomatic volunteers. The anterior, posterior, and inferior dislocations of shoulders with multidirectional instability could be properly modeled by the relative displacement between the rotation centers of the scapula and humerus. The shorter activity by m. pectoralis maior and all three parts of m. deltoideus and longer activity by m. supraspinatus, m. biceps brachii, and m. infraspinatus assure the centralization of the glenuhumeral head of a shoulder with multidirectional instability.

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Section: Discussionmentioning

confidence: 99%

“…Symptoms typically are associated with midrange positions of glenohumeral motion and often occur during activities of daily life [5]. The glenohumeral joint's relatively poor osseous and capsoligamentous stability necessitates a reliance on stabilization more than any other joint in the human body [30].…”

Section: Introductionmentioning

confidence: 99%

Kinematic and muscle activity characteristics of multidirectional shoulder joint instability during elevation

Illyés

Kiss²

2005

Knee Surg Sports Traumatol Arthr

View full text Add to dashboard Cite

show abstract

“…Symptoms typically are associated with midrange positions of glenohumeral motion and often occur during the activities of daily life [4]. The glenohumeral joint has relatively poor osseous and capsoligamentous stability, which necessitates reliance on stabilization more than any other joint in the human body [15, 27, 31].…”

Section: Introductionmentioning

confidence: 99%

Electromyographic analysis in patients with multidirectional shoulder instability during pull, forward punch, elevation and overhead throw

Illyés

Kiss²

2006

Knee Surg Sports Traumatol Arthrosc

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Multidirectional shoulder joint instability alters the role of dynamic stabilizers, as a result of which the motion patterns of the muscle around the shoulder joint are also changed. The aim of this study was to compare the muscle activity of patients with multidirectional shoulder instability and the control group during pull, forward punch, elevation and overhead throw. Fifteen subjects with multidirectional shoulder instability and fifteen control subjects with normal, healthy shoulders participated in the study. Both shoulders were tested in all subjects. Signals were recorded by surface EMG from eight different muscles during pull, forward punch, elevation and overhead throw. The mean and standard deviation of MVE% for the different movement types and time broadness values during overhead throw were determined for each muscle in both groups and compared with each other. Test results suggest that in case of patients with multidirectional shoulder instability the various motions are performed in a different way. The results give rise to the assumption that the centralization of the glenohumeral joint and the reduction of instability are attempted to be ensured by the organism through increasing the role of rotator cuff muscles and decreasing the role of the deltoid, biceps brachii and pectoralis maior muscles. The analysis of time broadness shows that in patients with multidirectional shoulder instability, the time difference between the peaks of normalized voluntary electrical activity is significantly greater than in the control group.

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Shoulder joint position sense improves with elevation angle in a novel, unconstrained task

Suprak

Osternig

Donkelaar

et al. 2006

Journal Orthopaedic Research

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Proprioception, encompassing the submodalities of kinesthesia and joint position sense, is important in the maintenance of joint stability, especially in the shoulder. The purpose of this study was to examine the effects of plane and elevation angle on unconstrained shoulder joint position sense. Twenty-two subjects (12 male, 10 female) without a history of shoulder pathology were recruited from a university campus. Subjects attempted to replicate, with respect to plane and elevation angles, various target positions. Target positions consisted of five plane angles at 908 of arm elevation and five arm elevation angles in the scapular plane. All target positions were tested twice to assess the reliability of the measurement. Intraclass correlation coefficients were generally low across target positions, possibly owing to the novelty and demanding nature of the task. No differences in repositioning errors were observed between plane angles (p ¼ 0.255). Repositioning errors decreased linearly as the elevation angle increased from 308 to 908 (p ¼ 0.007) and increased again from 908 to 1108 of elevation (p ¼ 0.029). Our results suggest that unconstrained joint position sense may be enhanced with increased muscular activation levels. Further, afferent feedback from musculotendinous mechanoreceptors may dominate over that from capsuloligamentous sources in unconstrained movements. ß

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The human glenohumeral joint

Cited by 39 publications

References 26 publications

Kinematic and muscle activity characteristics of multidirectional shoulder joint instability during elevation

Kinematic and muscle activity characteristics of multidirectional shoulder joint instability during elevation

Electromyographic analysis in patients with multidirectional shoulder instability during pull, forward punch, elevation and overhead throw

Shoulder joint position sense improves with elevation angle in a novel, unconstrained task

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