Abstract
The objectives of this study were to describe a technique for measuring in-vivo glenohumeral joint contact patterns during dynamic activities and to demonstrate application of this technique. The experimental technique calculated joint contact patterns by combining CT-based 3D bone models with joint motion data that were accurately measured from biplane x-ray images. Joint contact patterns were calculated for the repaired and contralateral shoulders of 20 patients who had undergone rotator cuff repair. Significant differences in joint contact patterns were detected due to abduction angle and shoulder condition (i.e., repaired versus contralateral). Abduction angle had a significant effect on the superior/inferior contact center position, with the average joint contact center of the repaired shoulder 12.1% higher on the glenoid than the contralateral shoulder. This technique provides clinically relevant information by calculating in-vivo joint contact patterns during dynamic conditions and overcomes many limitations associated with conventional techniques for quantifying joint mechanics.
Highlights
The treatment of many pathologic shoulder conditions relies implicitly on the belief that restoring normal glenohumeral joint mechanics is necessary to obtain a satisfactory clinical result
The joint contact center position moved predominantly in the S/I direction and relatively little in the A/P direction during shoulder abduction in both the repaired and contralateral shoulders (Figure 3), with abduction angle having a significant effect on S/I contact center position (P = .004) but not A/P contact center position (P = .675)
This study describes a technique for measuring in vivo glenohumeral joint contact patterns during dynamic activities, and demonstrates application of this technique by characterizing differences between repaired and contralateral shoulders of patients who have undergone rotator cuff repair
Summary
The treatment of many pathologic shoulder conditions (e.g., rotator cuff tears, glenohumeral joint instability) relies implicitly on the belief that restoring normal glenohumeral joint mechanics is necessary to obtain a satisfactory clinical result. MRI and CT are largely restricted to acquiring images under static conditions and conventional fluoroscopy is not designed to accurately measure motion in three dimensions. These conventional measurement techniques were not designed to assess three-dimensional, in vivo glenohumeral joint contact patterns during dynamic activities. The objectives of this study are to (1) describe a technique for measuring in vivo glenohumeral joint contact patterns during dynamic activities, and (2) demonstrate application of this technique by characterizing differences between shoulders in patients who had undergone rotator cuff repair
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
