Rotator Cuff Fatigue and Glenohumeral Kinematics in Participants Without Shoulder Dysfunction
- 1 July 2008
- journal article
- research article
- Published by Journal of Athletic Training/NATA in Journal of Athletic Training
- Vol. 43 (4), 352-358
- https://doi.org/10.4085/1062-6050-43.4.352
Abstract
Context: Researchers have established that superior migration of the humeral head increases after fatigue of the rotator cuff muscles. In these studies, the investigators used imaging techniques to assess migration of the humeral head during statically held shoulder positions. Their results may not represent the amount of superior humeral head migration that occurs during dynamic arm elevation.Objective: To investigate the effect of rotator cuff fatigue on humeral head migration during dynamic concentric arm elevation (arm at the side [approximately 0°] to 135°) in healthy individuals and to determine the test-retest reliability of digital fluoroscopic video for assessing glenohumeral migration.Design: Test-retest cohort study.Setting: Research laboratory.Patients or Other Participants: Twenty men (age = 27.7 ± 3.6 years, mass = 81.5 ± 11.8 kg) without shoulder disorders participated in this study.Intervention(s): Three digital fluoroscopic videos (2 prefatigue and 1 postfatigue) of arm elevation were collected at 30 Hz. The 2 prefatigue arm elevation trials were used to assess test-retest reliability with the arm at the side and at 45°, 90°, and 135° of elevation. The prefatigue and postfatigue digital fluoroscopic videos were used to assess the effects of rotator cuff fatigue on glenohumeral migration. All measurements were taken in the right shoulder.Main Outcome Measure(s): The dependent measure was glenohumeral migration (in millimeters). We calculated the intraclass correlation coefficient and standard error of the measurement to assess the test-retest reliability. A 2 × 4 repeated-measures analysis of variance was used to assess the effects of fatigue on arm elevation at the 4 shoulder positions.Results: The test-retest reliability ranged from good to excellent (.77 to .92). Superior migration of the humeral head increased postfatigue (P < .001), regardless of angle.Conclusions: Digital fluoroscopic video assessment of shoulder kinematics provides a reliable tool for studying kinematics during arm elevation. Furthermore, superior migration of the humeral head during arm elevation increases with rotator cuff fatigue in individuals without shoulder dysfunction.Keywords
This publication has 41 references indexed in Scilit:
- Proximal Migration Can Be Measured Accurately on Standardized Anteroposterior Shoulder RadiographsClinical Orthopaedics and Related Research, 2006
- Neuromuscular fatigue and aging: Central and peripheral factorsMuscle & Nerve, 2002
- Precision measurement of segmental motion from flexion—extension radiographs of the lumbar spineClinical Biomechanics, 1996
- Radiologic measurement of superior displacement of the humeral head in the impingement syndromeJournal of Shoulder and Elbow Surgery, 1996
- Excursion of the Rotator Cuff Under the AcromionThe American Journal of Sports Medicine, 1994
- Kinematic MRI of the ShoulderJournal of Computer Assisted Tomography, 1993
- Fluoroscopic evaluation for subtle shoulder instabilityThe American Journal of Sports Medicine, 1992
- Quantitation of in situ contact areas at the glenohumeral joint: A biomechanical studyJournal of Orthopaedic Research, 1992
- The shoulder impingement view: a fluoroscopic technique for the detection of subacromial spursAmerican Journal of Roentgenology, 1988
- Cineradiographic studies with shoulder instabilitiesThe American Journal of Sports Medicine, 1988