Halder, J Bone Joint Surg Am 2001 - Effects of the Glenoid Labrum and Glenohumeral Abduction on Stability of the Shoulder Joint through Concavity-Compression : An in Vitro Study

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Effects of the Glenoid Labrum and Glenohumeral Abduction on Stability of the Shoulder Joint through Concavity-Compression : An in Vitro Study

Halder, An, et al.·J Bone Joint Surg Am·2001·184 citations

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Background

Although the glenohumeral joint is the most mobile articulation of the human body, it is known to exhibit ball-and-socket kinematics. Compression into the glenoid labral concavity keeps the humeral head centered. The purpose of the present study was to determine the effects of joint position on glenohumeral stability through concavity-compression.

Methods

10 cadaveric shoulders were tested.
The glenoid was mounted horizontally onto a 6-component load-cell while the humerus was clamped to a vertically unconstrained slide.
An x-y stage translated the load-cell with the glenoid underneath the humeral head in 8 different directions.
Compressive loads of 20, 40, and 60 N were applied.
The tests were repeated in 0 degrees, 30 degrees, 60 degrees, and 90 degrees of glenohumeral abduction with and without the labrum.
Relative translations between the glenoid and the humeral head and the forces resisting translation were recorded.
Then the stability ratio, defined as the peak translational force divided by the applied compressive force, was calculated.

Results

The average stability ratio was higher in the hanging-arm position than it was in glenohumeral abduction.
The highest stability ratio was detected in the inferior direction (59.8% 7.7%) when the labrum was intact and in the superior direction (53.3% 7.9%) when the labrum had been resected.
Under both conditions, the anterior direction was associated with the lowest stability ratio (32.0% 4.4% with the labrum and 30.4% 4.1% without the labrum).
Resection of the glenoid labrum resulted in an average decrease in the stability ratio of 9.6% 1.7%.
With increasing compressive load, the average stability ratio slightly decreased.

Conclusions

Glenohumeral stability through concavity-compression was greater in the hanging-arm position than it was in glenohumeral abduction. The average contribution of the labrum to glenohumeral stability through concavity-compression was approximately 10%, about one-half of the value previously reported. With the labrum intact, the glenohumeral joint was most stable in the inferior direction. Without the labrum, it was most stable in the superior direction. Under both conditions, it was least stable in the anterior direction. Glenohumeral joint stability through concavity-compression decreases with higher compressive loads.

Copyright remains with the authors and publisher.

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Effects of the Glenoid Labrum and Glenohumeral Abduction on Stability of the Shoulder Joint through Concavity-Compression : An in Vitro Study

Halder, An, et al.·J Bone Joint Surg Am·2001·184 citations

|

Background

Although the glenohumeral joint is the most mobile articulation of the human body, it is known to exhibit ball-and-socket kinematics. Compression into the glenoid labral concavity keeps the humeral head centered. The purpose of the present study was to determine the effects of joint position on glenohumeral stability through concavity-compression.

Methods

10 cadaveric shoulders were tested.
The glenoid was mounted horizontally onto a 6-component load-cell while the humerus was clamped to a vertically unconstrained slide.
An x-y stage translated the load-cell with the glenoid underneath the humeral head in 8 different directions.
Compressive loads of 20, 40, and 60 N were applied.
The tests were repeated in 0 degrees, 30 degrees, 60 degrees, and 90 degrees of glenohumeral abduction with and without the labrum.
Relative translations between the glenoid and the humeral head and the forces resisting translation were recorded.
Then the stability ratio, defined as the peak translational force divided by the applied compressive force, was calculated.

Results

The average stability ratio was higher in the hanging-arm position than it was in glenohumeral abduction.
The highest stability ratio was detected in the inferior direction (59.8% 7.7%) when the labrum was intact and in the superior direction (53.3% 7.9%) when the labrum had been resected.
Under both conditions, the anterior direction was associated with the lowest stability ratio (32.0% 4.4% with the labrum and 30.4% 4.1% without the labrum).
Resection of the glenoid labrum resulted in an average decrease in the stability ratio of 9.6% 1.7%.
With increasing compressive load, the average stability ratio slightly decreased.

Conclusions

Glenohumeral stability through concavity-compression was greater in the hanging-arm position than it was in glenohumeral abduction. The average contribution of the labrum to glenohumeral stability through concavity-compression was approximately 10%, about one-half of the value previously reported. With the labrum intact, the glenohumeral joint was most stable in the inferior direction. Without the labrum, it was most stable in the superior direction. Under both conditions, it was least stable in the anterior direction. Glenohumeral joint stability through concavity-compression decreases with higher compressive loads.

Copyright remains with the authors and publisher.

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