Key legal question
Whether the claimant's left shoulder complaints were causally linked to the 2005 fight or to the 2004 accident/degenerative causes.
Extracted holding
The medical record did not allow a reliable determination of causation; an external expert opinion was required.
Extracted reasoning
The file contained conflicting medical opinions and no conclusive basis to decide whether the supraspinatus tear stemmed from degenerative changes, the 2004 accident, or the 2005 brawl.