Three-dimensional acromioclavicular joint motions during elevation of the arm

Rachael M. Teece, Jason B. Lunden, Angela S. Lloyd, Andrew P. Kaiser, Cort J. Cieminski, Paula M. Ludewig

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Fish eye STUDY DESIGN: Descriptive laboratory study. Fish eye OBJECTIVES: To determine the 3-dimensional motions occurring between the scapula relative to the clavicle at the acromioclavicular joint during humeral elevation in the scapular plane. Fish eye BACKGROUND: Shoulder pathology is commonly treated through exercise programs aimed at correcting scapular motion abnormalities. However, little is known regarding how acromioclavicular joint motions contribute to normal and abnormal scapulothoracic motion. Fish eye METHODS AND MEASURES: Thirty subjects (16 males, 14 females) participated. Subjects with positive symptoms on clinical exam or past history of shoulder pathology, trauma, or surgery were excluded. Electromagnetic surface motion analysis was performed tracking the thorax, clavicle, scapula, and humerus. Subjects performed 3 repetitions of scapular plane abduction. Passive motion data were also collected for scapular plane abduction from cadaver specimens. Data were analyzed using within-session reliability and descriptive statistics as well as repeated-measures analyses of variance (ANOVAs) to determine the effect of elevation angle from rest to 90° humeral elevation. Reliability was determined from repeated trials in the same session without removing sensors or redigitizing landmarks. Fish eye RESULTS: Angular values were highly repeatable within session (ICC>0.94; SEM, <2.3°). During active scapular plane abduction from rest to 90°, average acromioclavicular joint angular values demonstrated increased internal rotation (approximately 4.3°), increased upward rotation (approximately 14.6°), and increased posterior tilting (approximately 6.7°) (P<.05). Passive motions on cadavers demonstrated similar kinematic patterns. Fish eye CONCLUSIONS: Significant motion occurs at the acromioclavicular joint during active humeral elevation, contributing to scapular motion on the thorax. This information provides a foundation for understanding normal acromioclavicular joint motion as a basis for further investigation of pathology and rehabilitation approaches.

Original languageEnglish (US)
Pages (from-to)181-190
Number of pages10
JournalJournal of Orthopaedic and Sports Physical Therapy
Volume38
Issue number4
DOIs
StatePublished - Apr 2008

Bibliographical note

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • Human movement system
  • Kinematics
  • Scapula
  • Shoulder

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