Prying injury information out of NHL teams is a difficult task any time of the year. At playoff time, team officials probably would sooner give their bank account information to phone scammers than disclose the nature and severity of a player's injury.
The NHL permits teams to be vague on the basis that disclosing specifics might help a team's opponent, resulting in the all-too-familiar "upper body" and "lower body" injury terminology. The only way to know for sure who was hurting and who was resting in the final stages of the regular season is to count limbs at practice before the first playoff puck is dropped.