Biomechanical effects of supraspinatus repair on the glenohumeral joint

Yu, Jack C.; McGarry, Michelle H.; Lee, Yeonsoo; Duong, Long; Lee, Thay Q.

doi:10.1016/j.jse.2004.09.019

Cited by 35 publications

(27 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using specific markings for shoulder positioning, the shoulder testing system permitted highly accurate and precise positioning of the shoulder in a repeatable manner. 3,12,13,15,21 The long axis of the humerus was aligned parallel to the floor, achieving a total of 90°of shoulder abduction (30°of scapular inclination and 60°of glenohumeral abduction). The humerus was rotated, with alignment of the proximal-most portion of the biceps tendon with the anterior-most edge of the acromion; this was defined as 90°of external rotation.…”

Section: Specimen Preparationmentioning

confidence: 99%

Biomechanical effects of glenoid retroversion in total shoulder arthroplasty

Shapiro

McGarry

Gupta

et al. 2007

Journal of Shoulder and Elbow Surgery

Self Cite

217

View full text Add to dashboard Cite

Section: Specimen Preparationmentioning

confidence: 99%

Biomechanical effects of glenoid retroversion in total shoulder arthroplasty

Shapiro

McGarry

Gupta

et al. 2007

Journal of Shoulder and Elbow Surgery

Self Cite

217

View full text Add to dashboard Cite

“…For a normal shoulder, there was only a slight upward translation of humeral head, while with massive rotator cuff tears, the upward translation was much more important, and could even lead to subacromial impingement. In another cadaver study, repaired supraspinatus was compared to pathologic and simulated complete tear of the supraspinatus (Yu et al, 2005). A significant increase of contact pressure was observed between repaired and simulated complete supraspinatus tear, but only inferior translation of the humeral head was observed.…”

Section: Introductionmentioning

confidence: 99%

Effect of supraspinatus deficiency on humerus translation and glenohumeral contact force during abduction

Terrier

Reist

Vogel

et al. 2007

Clinical Biomechanics

View full text Add to dashboard Cite

Background. Supraspinatus deficiency is the most frequent and important problem associated to rotator cuff pathologies. It reduces shoulder stability and can lead to osteoarthritis. The goal of this study was to develop a numerical model of the shoulder to analyse the biomechanical consequences of this pathology.Methods. A 3D finite element model of the shoulder was developed from a normal cadaver specimen. It included the scapula, the humerus and the major abduction muscles. Instead of the usual ball-socket assumption, which prevents the natural translation of the humerus, shoulder stability was actively achieved by muscles. A feedback algorithm was developed to synchronise muscle forces during abduction. The numerical algorithm was validated against an algebraic model, and the calculated muscle moment arms were compared to the literature. Two cases were considered: a normal shoulder and the same one without supraspinatus.Findings. For the normal shoulder, the model predicted the initial upward migration of the humeral head. The maximal humerus translation occurred at 30°of abduction and was 0.75 mm above its ideal centered position. Without supraspinatus, it was 1.6 times higher and the contact point in the glenoid fossa was more eccentric. For the normal shoulder, the maximal glenohumeral force was 81% of the body weight, at 82°of abduction. Without supraspinatus, it increased by 8%, while the increase of muscle forces was 30%.Interpretation. Supraspinatus deficiency increased the upward migration of the humerus, the eccentric loading, and the joint and muscle forces, which may cause a limitation of active abduction and degenerative glenohumeral changes (osteoarthritis and the rotator cuff tear).

show abstract

“…16,42,47,50 According to Van der Helm, 47 subscapularis muscle activity during elevation is relatively low (<10 N); we therefore decided to simulate subscapularis function only by its passive action without removing the muscle fibers from the subscapularis fossa and without adding a traction system for the subscapularis muscle.…”

Section: Specimen Preparation and Loading Simulationmentioning

confidence: 99%