In Vivo Determination of the Dynamics of Normal, Rotator Cuff-Deficient, Total, and Reverse Replacement Shoulders by Mohamed Mahfouz, Gregory Nicholson,

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Presentation transcript:

In Vivo Determination of the Dynamics of Normal, Rotator Cuff-Deficient, Total, and Reverse Replacement Shoulders by Mohamed Mahfouz, Gregory Nicholson, Richard Komistek, David Hovis, and Matthew Kubo J Bone Joint Surg Am Volume 87(suppl 2): December 1, 2005 ©2005 by The Journal of Bone and Joint Surgery, Inc.

Three-dimensional overlay of a shoulder without an implant (left) and a shoulder with an implant (right). Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.

Illustration depicting the motion pattern for five points on the humeral head for a normal shoulder (superior/inferior [S/I] position = 15.8 mm; medial/lateral [M/L] position = 15.4 mm). Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.

Illustration depicting the motion pattern for five points on the humeral head for a rotator cuff- deficient shoulder (superior/inferior [S/I] position = 6.5 mm; medial/lateral [M/L] position = 6.9 mm). Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.

Illustration depicting the location of the axode for a subject who had been managed with reverse shoulder arthroplasty. Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.

Illustration depicting the average resultant torques in each group during the box-lifting motion. Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.

Illustration depicting the average resultant theoretical bearing-surface forces in each group during the box-lifting motion. Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.

Illustration depicting the resultant shoulder, elbow, and wrist forces for a single subject with a deficient rotator cuff. Mohamed Mahfouz et al. J Bone Joint Surg Am 2005;87: ©2005 by The Journal of Bone and Joint Surgery, Inc.