Does a Critical Rotator Cuff Tear Stage Exist? by Joo Han Oh, Bong Jae Jun, Michelle H. McGarry, and Thay Q. Lee J Bone Joint Surg Am Volume 93(22):2100-2109.

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Presentation transcript:

Does a Critical Rotator Cuff Tear Stage Exist? by Joo Han Oh, Bong Jae Jun, Michelle H. McGarry, and Thay Q. Lee J Bone Joint Surg Am Volume 93(22): November 16, 2011 ©2011 by The Journal of Bone and Joint Surgery, Inc.

Custom shoulder testing system. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Front view of custom shoulder testing system, demonstrating 30° of shoulder abduction with a 2:1 ratio of glenohumeral to scapulothoracic abduction. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Rotator cuff tear progression based on footprint anatomy. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

The abduction capability at each tear progression stage with increasing middle deltoid loading from 30 N to 70 N in increments of 10 N (*p < 0.05 vs. intact, +p < 0.05 vs. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

The humeral head apex anterior-posterior position relative to the intact condition for each tear stage at 30° of abduction with rotator cuff and deltoid loading (*p < 0.05 vs. intact). Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Anterior-posterior and superior-inferior position of humeral head apex at each humeral rotation angle in each cuff tear stage at 60° of abduction with rotator cuff, deltoid, pectoralis major, and latissimus dorsi muscle loading condition. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Effect of deltoid, pectoralis major, and latissimus dorsi muscle-loading on position of the humeral head apex at 0° of abduction with Stage-IV rotator cuff tear. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Balanced force couple. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.

Unbalanced force couple. Joo Han Oh et al. J Bone Joint Surg Am 2011;93: ©2011 by The Journal of Bone and Joint Surgery, Inc.