STUDY DESIGN Controlled laboratory study. OBJECTIVES To measure superior/inferior translation and external rotation of the humerus relative to the scapula during scapular plane abduction using 3-D/2-D model image registration techniques. BACKGROUND Kinematic changes in the glenohumeral joint, including excessive superior translation of the humeral head and inadequate external rotation of th...

Objectives: To correlate between the different lengths, angles of insertion and mini-implant material find out most retentive combination.
 Materials methods: 48 mini-implants (24 Titanium 24 stainless steel) lengths 6mm, 8mm 1.5 mm diameter were inserted into humerus bone goat at two angulations, 600 900. insert in respective custom made template was confirmed with digital radiographs. Fo...

Glenohumeral motion presents challenges for its accurate description across all available ranges of motion using conventional Euler/Cardan angle sequences without singularity. A comparison of the description of glenohumeral motion was made using the ISB recommended YX'Y″ sequence to the XZ'Y″ sequence. A direct in-vivo method was used for the analysis of dynamic concentric glenohumeral joint mo...

It is well known that proximal humerus fractures are among the three most frequent fracture types. Epidemiological invetsigations show that in people elder than 60 years the fracture of the proximal humerus is more frequent than fractures of the hip region (17). Over the last decades several techniques have been applied for treatment of proximal humerus fractures. Widely accepted is the initiat...

Methods for the three-dimensional (3-D) kinematic analysis of the shoulder complex (humerus relative to trunk) are presented and their use demonstrated in this analysis of shoulder motion during wheelchair propulsion. Ten subjects propelled two different wheelchairs (adjustable and conventional chairs) while the motions of the left arm and trunk were measured using a video tracking system. Eule...

The purpose of this study was to outline the epidemiologic criteria of humerus fractures after traumatic injuries. All patients admitted to the trauma service at the authors' institution between 2005 and 2011 were entered into a prospective database. The authors obtained data on age, sex, injury mechanism, presence and location of humerus fracture, associated injuries, mortality, Injury Severit...

In complex proximal humerus fractures, positioning of the tuberosities can be a challenge. This study demonstrates the constant angle between the pectoralis major (PM) and the medial lip of the bicipital groove (BG) on the horizontal axial plane. This angle can be used to determine the rotation, as well as the positioning of the tuberosities, when planning a hemiarthroplasty or a reconstruction...

Three-dimensional (3D) kinematic biofeedback can help identify scapular movement disorders and assist the subjects' motor relearning process by facilitating changes in physiological and biomechanical function through real-time knowledge of performance and result during or immediately after a task execution. This study assessed the effectiveness of 3D kinematic biofeedback on the quality of the ...