Appeal of CNA Insurance

The petitioner, CNA Insurance Company (CNA), appeals a decision of the New Hampshire Compensation Appeals Board (board) finding it liable for the claimant’s, Brian Bethune’s, cumulative trauma disability claim. We vacate and remand.

We recite the facts as found by the board or as presented in the record. Bethune developed low back pain in 1987, after approxi*744mately six years as a welder at Gilchrist Metal Fabricators, Inc. (employer). He first sought medical treatment for his condition in 1994. His physician diagnosed discogenic disease and prescribed physical therapy. In December 1994, his…