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Dynamic Glenohumeral Stability Provided by the Rotator Cuff Muscles in the Mid-Range and End-Range of Motion by Seok-Beom Lee, Kyu-Jung Kim, Shawn W. O'Driscoll,

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Presentation on theme: "Dynamic Glenohumeral Stability Provided by the Rotator Cuff Muscles in the Mid-Range and End-Range of Motion by Seok-Beom Lee, Kyu-Jung Kim, Shawn W. O'Driscoll,"— Presentation transcript:

1 Dynamic Glenohumeral Stability Provided by the Rotator Cuff Muscles in the Mid-Range and End-Range of Motion by Seok-Beom Lee, Kyu-Jung Kim, Shawn W. O'Driscoll, Bernard F. Morrey, and Kai- Nan An J Bone Joint Surg Am Volume 82(6):849-849 June 1, 2000 ©2000 by The Journal of Bone and Joint Surgery, Inc.

2 Drawing showing the universal humeral positioner, with the humerus in 60 degrees of abduction and 45 degrees of extension with respect to the fixed scapula. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

3 Photograph made after removal of the osteotomized glenoid, which was done to avoid contact between the humeral head and the glenoid during measurement of the force components. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

4 Top-view photograph showing the force components generated by the rotator cuff muscles with the humerus in neutral rotation (representing the mid-range of motion) in the abducted and extended shoulder. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

5 Top-view photograph showing the force components generated by the rotator cuff muscles with the humerus in 90 degrees of external rotation (representing the end-range of motion) in the abducted and extended shoulder. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

6 Figs. 5-A, 5-B, and 5-C: Graphs showing the force components generated by the rotator cuff muscles in the abducted and extended shoulder as the humerus was rotated from neutral to 90 degrees of external rotation in intervals of 22.5 degrees. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

7 Anterior-posterior shear force components. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

8 Superior-inferior shear force components. Seok-Beom Lee et al. J Bone Joint Surg Am 2000;82:849 ©2000 by The Journal of Bone and Joint Surgery, Inc.

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