Digital fluoroscopic video assessment of glenohumeral migration: Static vs. Dynamic conditions

Investigation of 3D glenohumeral displacements from 3D reconstruction using biplane X-ray images: Accuracy and reproducibility of the technique and preliminary analysis in rotator cuff tear patients

“…The superoinferior displacement trajectory in previous researches was various. Some researches found almost continuous humeral head displacement with respect to the glenoid from inferior to the glenoid center (Nishinaka et al, 2008), superior part of the glenoid (Teyhen et al, 2010) during shoulder abduction until 120-135°, while Graichen and colleges found a humeral head decrease from 60°to 90°o f shoulder abduction (Graichen et al, 2000). In the present study, a return to original superoinferior location was observed from 60°t o 90°of abduction in the patients and from 45°to 90°in asymptomatic volunteers.…”

“…In the present study, a return to original superoinferior location was observed from 60°t o 90°of abduction in the patients and from 45°to 90°in asymptomatic volunteers. This can be explained by the requirement of static poses that may underestimate the amount of superior glenohumeral migration compared to continuous movements (Teyhen et al, 2010). However, this difference should be under 1 mm (Graichen et al, 2000;Teyhen et al, 2010).…”

An integrated model of active glenohumeral stability

“…Finally, the joint reaction forces were applied to the FE model oriented in the respective glenohumeral position. Superior-inferior and antero-posterior joint translations were compared with in vivo measurements (Bey et al, 2008;Chopp et al, 2010;Graichen et al, 2005;Sahara et al, 2007, Teyhen et al, 2010. The results were considered comparable to previously reported experimental or in vivo measurements if the model output laid within the envelope of reported mean values (or within one standard deviation of reported results for the stability ratio).…”

Effects of scapular dyskinesis and scapular assistance test on subacromial space during static arm elevation

“…Less superior migration of the humerus on the glenoid has been found when the arm is actively held in discrete static positions, as compared to dynamically through a full arc. 41 Scapular kinematic alterations are more evident during dynamic testing conditions than during static conditions, 45 and with resistance (holding a weight) compared to no resistance 40 in individuals with shoulder pain. Thus, examination of scapular position in static arm positions may not have been challenging enough to reveal potential movement deficits that were observed visually during the screening examination.…”