The concussion rate in the AFL reached a 10-year high in 2015, according to the leagues annual injury survey.The average number of games missed by players due to concussion per AFL club jumped to 4.2 in 2015 - up from just 1.6 the previous year - to easily set a new high in the past decade of testing.But the AFL says greater precautions being taken in the reporting, diagnosis and treatment of concussions are behind the spike.Rates of concussions causing missed games continues to trend up ... this reflects a more conservative approach rather than a true increase in incidence, says the report, which was released on Friday afternoon.The injury and its long-term effects on AFL players has become an increasingly important issue in recent years, which has been highlighted with St Kilda youngster Paddy McCartin ruled out this week after suffering his third concussion of the season.Brisbanes Justin Clarke was forced into early retirement this season due to lingering concussion symptoms, with other players including Melbournes Angus Brayshaw and Heritier Lumumba, Hawthorns Jack Fitzpatrick and St Kildas Billy Longer having extended breaks after suffering knocks to the head.However, hamstring injuries continue to be the NO.1 reason players miss matches in the AFL.But the 19.1 games missed per club in 2015 was the lowest figure recorded in the past four surveys.Ruptured ACLs were next with 16.7 games missed per club last season, which was a big jump from the 2014 figure of 11.1.The average number of new injuries recorded by each club was 37.7 - up from the 2014 average of 36.1.Player health and welfare is a primary concern for the AFL, league football boss Mark Evans said.The annual injury survey will direct the work we do with our clubs, research board and others to continue to find ways to prevent injuries and improve recovery protocols. 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LAKE FOREST, Ill. -- The Chicago Bears had their coach back on Thursday.Although the quarterback and running back remained an entirely different matter.A day after missing practice because of a stomach virus, coach John Fox returned to Halas Hall and said quarterback Jay Cutler is not up to playing in a game at this point.So Cutler sat out of practice Thursday because of a sprained right thumb.I think we just didnt want to aggravate it more, Fox said. Again, a thumb on a throwing hand of a quarterback is a delicate situation. So we just figured we wouldnt go out there and have any stress on it.Cutler, who missed Sunday nights 31-17 loss at Dallas, had practiced Wednesday on a limited basis for the first time since his injury occurred Sept. 19 in a 29-14 loss to the Philadelphia Eagles.Fox said it wasnt a case where Cutlers thumb worsened after Wednesdays practice.No setbacks, just healing, Fox said.However, Cutler hadnt really done much throwing in Wednesdays practice as the winless Bears (0-3) prepared to host Detroit (1-2) Sunday.A clearer situation could present itself Friday, but backup Brian Hoyer continues to lead the offense while Cutler watches.Right now hes really not able, Fox said about Cutler. He can go out there and take snaps, but to be able to throw the ball into tight windows and the things youve got to do in this league to perform at a high level, if we feel good about that tomorrow (Friday) or we feel good about that Saturday, then (we) wouldnt hesitate to put him in.Right now its hard for me to say, until those days hit.Hoyer continues to operate under the uncertainty of whether hell start, but said its merely the life of an NFL backup.For me Im every day trying to prepare to play whatever his status is, Hoyer said. Until someone tells me different Im just preparing like Im going to play and thats if he was playing I would prepare the same way.Hoyer completed 30 of 49 for 317 yards with two touchdowns and no interceptions against Dallas, but was just 8-for-12 for 71 yards at halftime. Thee Bears managed only four first-half first downs and trailed 24-3.ddddddddddddIts possible Hoyers job would be easier with the other positions on offense more settled, but running back remains an issue.Starter Jeremy Langford has been out since suffering an ankle injury in Sundays game and backup KaDeem Carey remains out of practice after missing Sundays game entirely with a pulled hamstring.As a result, rookie Jordan Howard has taken first-team snaps and is the likely starter. Howard has 67 rushing yards on 12 attempts this season, but the fifth-round draft pick from Indiana has to display improvement in the passing game as a blocker.Hes getting there, offensive coordinator Dowell Loggains said. Hes getting closer.In the NFL, its a little bit different than college football with all the different fronts and with all the different personnel packages. Hes working really hard to get caught up to speed with that, but hes doing a nice job as a runner.The Bears rank 30th in the league in rushing and last in time of possession, so the running game has to show drastic improvement.Earlier this week, the Bears signed former Lions running back Joique Bell and hope to have him available after only a few practices for backup duty against his old team.Picking up the offense in such a short time will be a challenge.Asked if Bears coaches were picking his brain for information on the Lions, Bell said, Right now, I think theyre just trying to feed my brain.Game notes Guard Kyle Long (shoulder) went through a full practice after being limited Wednesday. Guard Josh Sitton (shoulder) practiced on a limited basis. ... Defensive end Mitch Unrein (knee) went through a full practice Thursday after being limited Wednesday. ... Safety Harold Jones-Quartey, who had suffered a concussion, was able to practice Thursday on a limited basis.---Online:AP NFL website: www.pro32.ap.org and www.twitter.com/AP-NFL ' ' '