Using a dynamic biomechanical model of malunion of the shoulder, we have determined the change in deltoid force required for abduction with various combinations of superior and posterior displacement of fractures of the greater tuberosity of the humerus. We tested eight fresh human cadaver shoulders in a dynamic shoulder-testing apparatus during cycles of glenohumeral abduction from 0 degrees t...

This study investigated how the human CNS organizes complex three-dimensional (3D) ball-throwing movements that require both speed and accuracy. Skilled baseball players threw a baseball to a target at three different speeds. Kinematic analysis revealed that the fingertip speed at ball release was mainly produced by trunk leftward rotation, shoulder internal rotation, elbow extension, and wrist...

In this paper, we present a simultaneous and continuous kinematics estimation method for multiple DoFs across shoulder and elbow joint. Although simultaneous and continuous kinematics estimation from surface electromyography (EMG) is a feasible way to achieve natural and intuitive human-machine interaction, few works investigated multi-DoF estimation across the significant joints of upper limb,...

OBJECTIVES To analyse the risk of shoulder impingement syndrome relative to shoulder intensive work. METHODS A cross sectional study of a historical cohort of 1591 workers employed between 1986 and 1993 at a slaughterhouse or a chemical factory. Workers not doing tasks in slaughtering or meat processing constituted the reference group. Intensity of shoulder work in meat processing tasks was a...

BACKGROUND Shoulder pain is a common problem that can impact on work. Leisure time physical activity (LTPA) has the potential to reduce the impact of shoulder pain through its physiological, psychological and social benefits. AIMS To determine whether LTPA reduces the prevalence of shoulder pain in a working population. METHODS Participants were selected from a longitudinal population-based...

background :dysfunction in the kinetic chain caused by poor scapula stabilization can contribute to shoulder injuries and shoulder impingement syndrome (sis). the purpose of this study was to compare the effectiveness of two treatment approaches scapular stabilization based exercise therapy and physical therapy in patients with sis.   methods : the study is a randomized clinical trial in which ...

Laxity testing is an important part of the examination of any joint. In the shoulder, it presents unique challenges because of the complexity of the interactions of the glenohumeral and scapulothoracic joints. Many practitioners believe that laxity testing of the shoulder is difficult, and they are unclear about its role in evaluation of patients. The objectives of the various laxity and instab...

A frozen shoulder is a common cause of a painful and stiff shoulder. A web-based survey was conducted to obtain insight in the current preferences about the diagnosis and treatment of a frozen shoulder. A response rate of 54% was reached among shoulder specialized orthopaedic surgeons from the Netherlands and Belgium. Non-steroidal anti-inflammatory drugs and intra-articular corticosteroid inje...

The present study examined muscular activity in the primate proximal forelimb during a posture task. By applying loads selectively to the shoulder, elbow, or both joints, we observed that monoarticular shoulder and elbow muscles varied their activity with loads at the unspanned joint. Shoulder monoarticulars changed activity with elbow torque and elbow monoarticulars changed activity with shoul...

We chose 60 patients with shoulder joint injury that have received arthroscopic anchor implantation fixation treatment in Southwest Hospital from January 2012 to October 2015 and divided them into a control group and an observation group equally, using computer single-blind randomized method. Patients with shoulder joint injury in the control group have received conservative treatment, while pa...