Instrumented measurement of glenohumeral joint laxity: reliability and normative data

This study assessed shoulder laxity using an instrumented arthrometer. We compared anterior and posterior translations at various force levels to determine the reliability of our measurement technique and to provide normative data in healthy shoulders. Fifty shoulders were assessed for glenohumeral...

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Bibliographic Details
Published in:Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA sports traumatology, arthroscopy : official journal of the ESSKA, 2001, Vol.9 (1), p.34-41
Main Authors: Sauers, E L, Borsa, P A, Herling, D E, Stanley, R D
Format: Article
Language:English
Subjects:
Adult
Aluminum
Analysis
Anthropometry
Biomechanical Phenomena
Equipment Design
Health
Humans
Joint Instability - diagnosis
Joint stability
Load
Measurement
Measurement techniques
Observer Variation
Orthopedic Equipment
Reference Values
Reliability
Reproducibility
Reproducibility of Results
Shoulder
Shoulder - pathology
Shoulder - physiology
Shoulders
Sports
Surgery
Techniques
Variance analysis
Weight-Bearing
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Summary:This study assessed shoulder laxity using an instrumented arthrometer. We compared anterior and posterior translations at various force levels to determine the reliability of our measurement technique and to provide normative data in healthy shoulders. Fifty shoulders were assessed for glenohumeral joint laxity in two directions (anterior and posterior) and at four force levels (67, 89, 111, and 134 N). The dependent measure was joint displacement. Laxity values were widely, yet normally, distributed in our group of healthy shoulders. Intraclass correlation coefficients revealed excellent between-trial reliability (0.92) and fair between-session (0.73) and between-examiner (0.74) reliability. The average standard error of measurement between trials (0.56 mm), sessions (1.5 mm), and examiners (1.7 mm) demonstrated an unprecedentedly high degree of precision for quantifying glenohumeral joint laxity. Paired t tests revealed no significant laxity differences between sides (P>0.05), indicating bilateral symmetry. A 2 (direction) x 4 (force) analysis of variance revealed significant differences in laxity between directions (P
ISSN:0942-2056
1433-7347
DOI:10.1007/s001670000174