Report: Johansen diagnosed with acute compartment syndrome
Christopher Hanewinckel / USA Today Sports

Predators forward Ryan Johansen, who has been ruled out for the NHL playoffs after undergoing thigh surgery, was diagnosed with acute compartment syndrome, according to Jon Morosi of NHL Network and FOX Sports.

Acute compartment syndrome occurs when excessive pressure builds up inside an enclosed muscle space in the body. It usually results from bleeding or swelling after an injury. It can be limb- and life-threatening.

Morosi added that Johansen is doing well and is expected to recover fully.

Johansen was seen taking an awkward hit along the boards during the second period of Game 4. He appeared to be favoring his left leg after the play as he skated to the bench, but ended up finishing the game. He then underwent emergency surgery following the overtime loss.

Report: Johansen diagnosed with acute compartment syndrome
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