Biomechanical Basis of Shoulder Osseous Deformity and Contracture in a Rat Model of Brachial Plexus Birth Palsy by Dustin L. Crouch, Ian D. Hutchinson,

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Presentation transcript:

Biomechanical Basis of Shoulder Osseous Deformity and Contracture in a Rat Model of Brachial Plexus Birth Palsy by Dustin L. Crouch, Ian D. Hutchinson, Johannes F. Plate, Jennifer Antoniono, Hao Gong, Guohua Cao, Zhongyu Li, and Katherine R. Saul J Bone Joint Surg Am Volume 97(15): August 5, 2015 ©2015 by The Journal of Bone and Joint Surgery, Inc.

Custom test fixture used to measure the maximum passive external shoulder rotation angle (ERmax). Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.

Muscle mass difference between the affected (left) and unaffected (right) forelimbs. Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.

Ratio of internal rotator (pectoralis major and subscapularis) to external rotator (supraspinatus, infraspinatus, and spinodeltoid) muscle mass. Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.

Optimal muscle length difference between the affected (left) and unaffected (right) forelimbs. Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.

Bilateral difference in maximum passive external shoulder rotation angle, ERmax (affected – unaffected). Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.

Glenoid version and inclination angles in affected forelimbs. Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.

Anteroposterior subluxation and superoinferior translation of the humeral head relative to the scapula. Dustin L. Crouch et al. J Bone Joint Surg Am 2015;97: ©2015 by The Journal of Bone and Joint Surgery, Inc.