Concussion incidence and time lost from play in the NHL during the past ten years

Abstract

Background: The problem of concussions in professional hockey has attracted much recent attention. To evaluate the current state of this injury the National Hockey League (NHL), we analyzed the concussion incidence and time lost from play due to concussions during the past ten NHL seasons. Methods: Data were obtained from a complete review of injury reports in two different sports media sources covering the NHL seasons 1997-98 through 2007-08. Time lost from play was measured in missed games per concussion. Results: The incidence of concussions reported in the regular season ranged from a high of 1.81/1000 athlete exposures in 1998-99 to a low of 1.04/1000 athlete exposures in 2005-06. There was a downward trend in the number of concussions reported per season during the past ten years (p=0.01). However, average time lost from play per concussion increased over the same period (p<0.0005). Forwards suffered a disproportionately high percentage of concussions (p<0.0001). Conclusions: Possibly related to injury reduction efforts, the number of concussions reported per season in the NHL has trended downward in recent years. However, the incidence of concussion remains high and the average time lost from play per concussion has increased. This may reflect increased injury severity in recent years or, alternatively, increased adherence to modern management guidelines preventing premature return to play.