Comparison of 3-dimensional shoulder complex kinematics in individuals with and without shoulder pain, part 2: Glenohumeral joint

Rebekah L. Lawrence, Jonathan P. Braman, Justin L. Staker, Robert F. Laprade, Paula M. Ludewig

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

STUDY DESIGN: Cross-sectional. Copyright

OBJECTIVES: To compare differences in glenohumeral joint angular motion and linear translations between symptomatic and asymptomatic individuals during shoulder motion performed in 3 planes of humerothoracic elevation. TTBACKGROUND: Numerous clinical theories have linked abnormal glenohumeral kinematics, including decreased glenohumeral external rotation and increased superior translation, to individuals with shoulder pain and impingement diagnoses. However, relatively few studies have investigated glenohumeral joint angular motion and linear translations in this population.

METHODS: Transcortical bone pins were inserted into the scapula and humerus of 12 asymptomatic and 10 symptomatic participants for direct bone-fixed tracking using electromagnetic sensors. Glenohumeral joint angular positions and linear translations were calculated during active shoulder flexion, abduction, and scapular plane abduction.

RESULTS: Differences between groups in angular positions were limited to glenohumeral elevation, coinciding with a reduction in scapulothoracic upward rotation. Symptomatic participants demonstrated 1.4 mm more anterior glenohumeral translation between 90° and 120° of shoulder flexion and an average of 1 mm more inferior glenohumeral translation throughout shoulder abduction.

CONCLUSION: Differences in glenohumeral kinematics exist between symptomatic and asymptomatic individuals. The clinical implications of these differences are not yet understood, and more research is needed to understand the relationship between abnormal kinematics, shoulder pain, and pathoanatomy.

Original languageEnglish (US)
Pages (from-to)646-655
Number of pages10
JournalJournal of Orthopaedic and Sports Physical Therapy
Volume44
Issue number9
DOIs
StatePublished - Sep 1 2014

Keywords

  • Biomechanics
  • Glenohumeral translations
  • Impingement syndrome

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