It was at the beginning of the third period, with a 2-1 lead, that Kellman landed badly after a tackle along the rim.
However, LHC's Craig Schira, who handed out the tackle, got away with neither sending off nor match penalty as it was judged to be fair.
Medical personnel were quickly on the scene, and after about five minutes the 28-year-old was taken out on a stretcher.
Växjö eventually won 4-1.
"However, most thoughts go to Kellman, who after a minute into the final period had to leave the ice on a stretcher, unclear as to his status in this now," writes the SHL club.
The article is being updated!