Injuries are an unfortunate part of the game. Every team must deal with them, but some teams get hurt harder than others. Today, we're taking a look at the teams that have been impacted the most this season. Here's our ranking of the top three:

1. Northwestern: Injuries have played a major role in the Wildcats' 0-3 start in Big Ten play. All-American kick returner and star tailback Venric Mark has been healthy enough to play exactly one full game -- against Ohio State. Quarterback Kain Colter has been banged up just about all season as well. Both were reinjured at Wisconsin and missed all of last week's loss to Minnesota. In addition, top defensive tackle Sean McEvilly has played in only three games, while starting cornerback Daniel Jones suffered a season-ending knee injury in the opener at Cal.

2. Penn State: The Nittany Lions had major depth issues to begin with because of NCAA sanctions. It hasn't helped that they have also dealt with a series of injuries. Tight ends Matt Lehman and Brent Wilkerson and defensive end Brad Bars were lost for the season. Linebacker Mike Hull was hurt for most of the first two months, as was tight end Kyle Carter. Wide receiver Brandon Felder missed the Indiana loss with an ankle problem. Linebacker Ben Kline has been limited after offseason shoulder surgery. Safety Ryan Keiser has been dealing with a hand injury since the Kent State game. This team can't afford many more injuries as it approaches the homestretch of the season.

3. Nebraska: The Huskers' injury problems haven't adversely affected them -- at least not yet. Still, it's never easy when you lose your four-year starting quarterback, and Taylor Martinez hasn't played since Week 3 versus UCLA because of turf toe. He could be back this week, but All-American guard Spencer Long was lost for the season in the last game against Purdue with a knee injury. He'll be tough to replace.