Shoulder biomechanics.

The biomechanics of the glenohumeral joint depend on the interaction of both static and dynamic-stabilizing structures. Static stabilizers include the bony anatomy, negative intra-articular pressure, the glenoid labrum, and the glenohumeral ligaments along with the joint capsule. The dynamic-stabilizing structures include the rotator cuff muscles and the other muscular structures surrounding the shoulder joint. The combined effect of these stabilizers is to support the multiple degrees of motion within the glenohumeral joint. The goal of this article is to review how these structures interact to provide optimal stability and how failure of some of these mechanisms can lead to shoulder joint pathology.

[1]  E. M. Wolf,et al.  Humeral avulsion of glenohumeral ligaments as a cause of anterior shoulder instability. , 1995, Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association.

[2]  Freddie H. Fu,et al.  The Role of the Long Head of the Biceps Muscle and Superior Glenoid Labrum in Anterior Stability of the Shoulder , 1994, The American journal of sports medicine.

[3]  K. An,et al.  Dynamic anterior stabilisers of the shoulder with the arm in abduction. , 1994, The Journal of bone and joint surgery. British volume.

[4]  Richard E Debski,et al.  Anatomy and function of the glenohumeral ligaments in anterior shoulder instability. , 2002, Clinical orthopaedics and related research.

[5]  R. Warren,et al.  Effect of lesions of the superior portion of the glenoid labrum on glenohumeral translation. , 1995, The Journal of bone and joint surgery. American volume.

[6]  K. An,et al.  Effects of the Glenoid Labrum and Glenohumeral Abduction on Stability of the Shoulder Joint Through Concavity-Compression: An in Vitro Study , 2001, The Journal of bone and joint surgery. American volume.

[7]  J A Sidles,et al.  The role of the rotator interval capsule in passive motion and stability of the shoulder. , 1992, The Journal of bone and joint surgery. American volume.

[8]  Peter J Millett,et al.  Anatomy and dimensions of rotator cuff insertions. , 2002, Journal of shoulder and elbow surgery.

[9]  K. An,et al.  Arthroscopic versus open rotator interval closure: biomechanical evaluation of stability and motion. , 2007, Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association.

[10]  J. Perry.  Theory of Shoulder Mechanism—Descriptive and Applied , 1963 .

[11]  Patrick J McMahon,et al.  Stability and instability of the glenohumeral joint: the role of shoulder muscles. , 2005, Journal of shoulder and elbow surgery.

[12]  G C Terry,et al.  Functional anatomy of the shoulder. , 2000, Journal of athletic training.

[13]  S M Howell,et al.  The glenoid-labral socket. A constrained articular surface. , 1989, Clinical orthopaedics and related research.

[14]  K. An,et al.  The Effect of a Glenoid Defect on Anteroinferior Stability of the Shoulder After Bankart Repair: A Cadaveric Study* , 2000, The Journal of bone and joint surgery. American volume.

[15]  M L Pearl,et al.  Dynamic electromyographic analysis of the throwing shoulder with glenohumeral instability. , 1988, The Journal of bone and joint surgery. American volume.

[16]  Andreas B. Imhoff,et al.  Anatomy and biomechanics of the shoulder , 2003 .

[17]  S. Burkhart,et al.  Quantifying glenoid bone loss arthroscopically in shoulder instability. , 2002, Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association.

[18]  R. Warren,et al.  Articular contact patterns of the normal glenohumeral joint. , 1998, Journal of shoulder and elbow surgery.

[19]  E. McFarland,et al.  Laxity Testing of the Shoulder , 2007, The American journal of sports medicine.

[20]  E. Audenaert,et al.  About the variability of the shape of the glenoid cavity , 2004, Surgical and Radiologic Anatomy.

[21]  A R Karduna,et al.  Kinematics of the glenohumeral joint: Influences of muscle forces, ligamentous constraints, and articular geometry , 1996, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[22]  L. Soslowsky,et al.  Interplay of the static and dynamic restraints in glenohumeral instability. , 2002, Clinical orthopaedics and related research.

[23]  Freddie H Fu,et al.  The effect of rotator cuff tears on reaction forces at the glenohumeral joint , 2002, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[24]  Kai-Nan An,et al.  Dynamic Glenohumeral Stability Provided by Three Heads of the Deltoid Muscle , 2002, Clinical orthopaedics and related research.

[25]  F. Girgis,et al.  Stabilizing mechanisms preventing anterior dislocation of the glenohumeral joint. , 1981, The Journal of bone and joint surgery. American volume.