It has been recognized by clinical experience and laboratory study that the rotator cuff muscle tendon complex has a functionally important role in generating load and maintaining stability of the glenohumeral joint. The purpose of this study is to continue the investigation of the rotator cuff complex by focusing on two general hypotheses: a) that the rotator cuff muscle complex contributes significantly to shoulder strength; and b) that the rotator cuff tendons are exposed to stress levels which can potentially result in tissue failure. The project has four Specific Aims, two associated with each hypothesis. Relative to the first hypothesis, Specific Aim 1 is to investigate the contribution of the rotator cuff muscle complex to shoulder strength for selected functions and joint positions by using the developed analytical model.
Specific Aim 2 is to examine the influence of the type of cuff tear on shoulder strength by measuring the strength of patients with cuff pathology and associated pain, before and after injection with local anesthesia. Postulates based on the effects of tear size and number of tendons involved will be tested. In examination of the second major hypothesis, Specific Aim 3 is to evaluate the structural and material properties of the rotator cuff tendons. Mechanical testing will be performed to determine the structural strength and failure mode of the supraspinatus, infraspinatus, and subscapularis tendons.
Specific Aim 4 is to calculate the stress distribution in the supraspinatus tendon for selected loading conditions. The information gathered from this study is intended to provide a better understanding of the nature of rotator cuff pathology and its clinical significance.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
5R01AR041171-08
Application #
6043199
Study Section
Orthopedics and Musculoskeletal Study Section (ORTH)
Program Officer
Panagis, James S
Project Start
1992-01-01
Project End
2000-07-31
Budget Start
1999-08-01
Budget End
2000-07-31
Support Year
8
Fiscal Year
1999
Total Cost
Indirect Cost
Name
Mayo Clinic, Rochester
Department
Type
DUNS #
City
Rochester
State
MN
Country
United States
Zip Code
55905
Silver, Aaron E; Lungren, Matthew P; Johnson, Marjorie E et al. (2006) Using support vector machines to optimally classify rotator cuff strength data and quantify post-operative strength in rotator cuff tear patients. J Biomech 39:973-9
Langenderfer, Joseph E; Carpenter, James E; Johnson, Marjorie E et al. (2006) A probabilistic model of glenohumeral external rotation strength for healthy normals and rotator cuff tear cases. Ann Biomed Eng 34:465-76
Nakajima, T; Hughes, R E; An, K-N (2004) Effects of glenohumeral rotations and translations on supraspinatus tendon morphology. Clin Biomech (Bristol, Avon) 19:579-85
Hsu, Horng-Chaung; Luo, Zong-Ping; Stone, James J et al. (2003) Correlation between rotator cuff tear and glenohumeral degeneration. Acta Orthop Scand 74:89-94
Mura, Nariyuki; O'Driscoll, Shawn W; Zobitz, Mark E et al. (2003) The effect of infraspinatus disruption on glenohumeral torque and superior migration of the humeral head: a biomechanical study. J Shoulder Elbow Surg 12:179-84
Mura, Nariyuki; O'Driscoll, Shawn W; Zobitz, Mark E et al. (2003) Biomechanical effect of patch graft for large rotator cuff tears: a cadaver study. Clin Orthop Relat Res :131-8
Luo, Zong-Ping; Hsu, Horng-Chaung; An, Kai-Nan (2002) An in vitro study of glenohumeral performance after suprascapular nerve entrapment. Med Sci Sports Exerc 34:581-6
Lee, Seok-Beom; An, Kai-Nan (2002) Dynamic glenohumeral stability provided by three heads of the deltoid muscle. Clin Orthop Relat Res :40-7
Halder, A M; O'Driscoll, S W; Heers, G et al. (2002) Biomechanical comparison of effects of supraspinatus tendon detachments, tendon defects, and muscle retractions. J Bone Joint Surg Am 84-A:780-5
Lee, S B; Itoi, E; O'Driscoll, S W et al. (2001) Contact geometry at the undersurface of the acromion with and without a rotator cuff tear. Arthroscopy 17:365-72

Showing the most recent 10 out of 45 publications