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Effects of glenosphere positioning on impingement-free internal and external rotation after reverse total shoulder arthroplasty.
Burkhart's group (2003a) believe that in the presence of a tight and thickened postero-inferior glenohumeral capsule, horizontal abduction combined with external rotation as is shown in the arm cocking phase will be associated with a postero-superior translation of the humeral head relative to the glenoid such that it no longer contacts the posterosuperior glenoid labrum.
At scapular plane, in a seated position, subjects were instructed to slowly (using a metronome) reach the end-range of humeral external rotation followed by end-range of internal rotation.
25-27) Furthermore, medializing the humerus also moves the rotator cuff insertions, which shortens the residual rotator cuff muscle length and can have negative implications on postoperative internal and external rotation.
Additionally, the use of posterior augmented glenoid baseplates with and without posterior wear resulted in more anatomic tensioning of the rotator cuff muscles; this information is useful to the surgeon to potentially improve stability and restore active internal and external rotation, a current limitation of rTSA.
two legged take-off) we found differences in the lower body movements (hip and knee flexion/extension) as well as pelvis and trunk external rotation (Figure 5B).
Radiographic imaging should begin with standard anteroposterior, axillary, and internal and external rotation views of the glenohumeral joint.
Counter the force of turnout's external rotation by sitting on a bed or table (so your feet are off the floor) with a resistance band around your thighs, and your ankles together.
16) Measurements were taken in forward elevation (FE), external rotation at 0[degrees]of abduction (ER0), external rotation at 90[degrees] of abduction (ER90), and internal rotation at 90[degrees] of abduction (IR90).
Clinical improvement after rTSA is greater if there is some remaining functional posterior rotator cuff or if additional external rotation torque is provided by other means, such as a latissimus dorsi muscle transfer to the posterior proximal humerus.
The patient usually complains of pain in the groin, thigh or knee with limitation of external rotation and leg length shortening.

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