If you've been following the sport, MMA (the UFC in this case) has always [to some extent] had problems with injuries. Back then, fighters were more willing to go into a bout injured, but with the introduction of the UFC's insurance coverage, fighters are now more willing to pull out of a fight. Before the fighter insurance, if you sustained an injury during training camp, the medical cost would come out of your own pocket. So if fighters pulled out a fight due to injury, not only would they miss a pay cheque, they would have to pay for their own medical expenses. That isn't the case now (since mid 2011). It isn't a coincidence that when this policy was introduced (in the UFC), fighters were pulling out due to injuries at an all time high.
Injuries are far more prevalent in MMA than any other major sport. Think about it, for 5 days a week, you are getting kicked, punched, taken down, put into various locks/chokes, etc. Injuries are going to happen. Now when fighters have better trainers/facilities you will see these injuries decrease, but [to some degree] they will always be there.
I know about the insurance thing, fighters fight with injuries all that time, Jon Jones still has the toe injury, he was even limping out of the cage his fight which he won easily, but a lot of fighters pull out of fights because they need more time and use that has an excuse, which is what I think happened with weidman when he knew he was fighting machida instead of belfort,
Facilities and trainers are at their best right now, but all that shyt doesn't really matter it' about how the partners interact with ech other
the injuries coming because guys are training too hard during the camp, you can't go all out it and expect not to get injured
you got top guys from all over coming in these gyms to train, because frankly quality sparring is slim, so it gets really competitive and guys go over bored
training camp is like 2 months for one fight, so 4 months out the year you are in training as high level, and most guys peak before they get to the cage, and it even though the calender the year has changed, a year's time has not passed before they go back into training, so they don't get enough rest, which is why a lot of guys use steroids
once again this is not boxing, where guys do get Knocked out in sparring, they don't have to worry having their knee blown out because somebody decided to take them down while working on stand up like overeem did
UFC model is boxing, and the sport is not boxing, so the same time tables do not apply and need to be changed