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Measuring humeral head translation using fluoroscopy: a validation study.

Authors
San Juan-JG; Karduna-AR
Source
J Biomech 2010 Mar; 43(4):771-774
NIOSHTIC No.
20036848
Abstract
Numerous techniques have been employed to monitor humeral head translation due to its involvement with several shoulder pathologies. However, most of the techniques were not validated. The objective of this study is to compare the accuracy of manual digitization and contour registration in measuring superior translation of the humeral head. Eight pairs of cadaver scapulae and humerii bones were harvested for this study. Each scapula and humerus was secured in a customized jig that allowed for control of humeral head translations and a vise that permitted rotations of the scapula about three axes. Fluoroscopy was used to take images of the shoulder bones. Scapular orientation was manipulated in different positions while the humerus was at 90 degrees of humeral elevation in the scapular plane. Humeral head translation was measured using the two methods and was compared to the known translation. Additionally, accuracy of the contour registration method to measure 2-D scapular rotations was assessed. The range for the root mean square (RMS) error for manual digitization method was 0.27 mm-0.43 mm and the contour registration method had a RMS error ranging from 0.18 mm-0.40 mm. In addition, the RMS error for the scapular angle rotation using the contour registration method was 2.4 degrees . Both methods showed acceptable errors. However, on average, the contour registration method showed lesser measurement error compared to the manual digitization method. In addition, the contour registration method was able to show good accuracy in measuring rotation that is useful in 2-D image analysis.
Keywords
Biodynamics; Biological-factors; Biological-function; Biological-systems; Biomechanical-modeling; Biomechanics; Bone-structure; Clinical-techniques; Laboratory-testing; Musculoskeletal-system; Skeletal-movement; Skeletal-system; Statistical-analysis; Author Keywords: Glenohumeral Kinematics; 2-D measurement; Fluoroscopy; Humeral head; Superior translation
Contact
Jun G. San Juan, Loras College, Division of Physical Education and Sports Studies, 1450 Alta Vista St., Dubuque, IA 52001
CODEN
JBMCB5
Publication Date
20100303
Document Type
Journal Article
Email Address
jun.sanjuan@loras.edu
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008288
Issue of Publication
4
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
OR; IA
Performing Organization
University of Oregon
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