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Three‐dimensional repositioning tasks show differences in joint position sense between active and passive shoulder motion
Author(s) -
Erickson R. I. Carl,
Karduna Andrew R.
Publication year - 2012
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.22007
Subject(s) - proprioception , throwing , motion (physics) , position (finance) , physical medicine and rehabilitation , set (abstract data type) , joint (building) , shoulder joint , medicine , computer science , artificial intelligence , physical therapy , engineering , surgery , aeronautics , architectural engineering , finance , economics , programming language
Proprioception is important in maintaining shoulder joint stability. Previous studies investigated the effects of unconstrained multiplanar motion, with subjects able to move freely in space, on repositioning tasks for active shoulder motion but not passive motion. We sought to further explore joint position sense with 3D passive, robot‐guided motions. We hypothesized that target repositioning error would be greater in the case of passively placed targets than for actively placed targets. To investigate, 15 healthy individuals participated (8 female, 7 male), who were at most 6 ft (183 cm) tall to accommodate the equipment, and who had no history of shoulder injury, surgery, or significant participation in throwing sports. Target orientations were centered at 44° of elevation and 32° of horizontal rotation from the frontal plane. Two sets of 10 trials were performed. The first set involved active placement followed by active replacement, and the second set involved passive, robot‐guided, placement followed by active replacement. Repositioning error was greater following passive placement than active placement ( p < 0.001). These results further our understanding of the differences between active and passive joint position sense at the shoulder. © 2011 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res 30:787–792, 2012