Dynamic in vivo glenohumeral kinematics during scapular plane abduction in healthy shoulders

Controlled laboratory study. 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. Kinematic changes in the glenohumeral joint, including excessive superior translation...

Full description

Saved in:
Bibliographic Details
Published in:The journal of orthopaedic and sports physical therapy 2012-02, Vol.42 (2), p.96-104
Main Authors: Matsuki, Keisuke, Matsuki, Kei O, Yamaguchi, Satoshi, Ochiai, Nobuyasu, Sasho, Takahisa, Sugaya, Hiroyuki, Toyone, Tomoaki, Wada, Yuichi, Takahashi, Kazuhisa, Banks, Scott A
Format: Article
Language:English
Subjects:
Adult
Biomechanical Phenomena
Humans
Imaging, Three-Dimensional
Japan
Male
Models, Anatomic
Range of Motion, Articular - physiology
Scapula - physiology
Shoulder Joint - physiology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Controlled laboratory study. 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. Kinematic changes in the glenohumeral joint, including excessive superior translation of the humeral head and inadequate external rotation of the humerus, are believed to be a possible cause of shoulder impingement. Although many researchers have analyzed glenohumeral kinematics with various methods, few articles have assessed dynamic in vivo glenohumeral motion. Twelve healthy males with a mean age of 32 years (range, 27-36 years) were enrolled in this study. Fluoroscopic images of the dominant shoulder during scapular plane elevation were taken, and computed tomography-derived 3-D bone models were matched with the silhouette of the bones in the fluoroscopic images using 3-D/2-D model image registration techniques. The kinematics of the humerus relative to the scapula were determined using Euler angles. On average, there was 2.1 mm of initial humeral translation in the superior direction from the starting position to 105° of humeral elevation. Subsequently, an average of 0.9 mm of translation in the inferior direction occurred between 105° and maximum arm elevation. The average amount of external rotation of the humerus was 14° from the starting position to 60° of humeral elevation. The humerus then rotated internally an average 9° by the time the shoulder reached maximum elevation. These changes in superior/inferior translation and external/internal rotation were statistically significant (P
ISSN:0190-6011
1938-1344
DOI:10.2519/jospt.2012.3584