RT Journal Article SR Electronic T1 Multidirectional acromioclavicular joint instability posttrauma JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP 434 OP 434 VO 49 IS 6 A1 Edward J. Harvey A1 Rudolf Reindl A1 Gregory K. Berry YR 2006 UL http://canjsurg.ca/content/49/6/434.abstract