Are there any trends that you've noticed? Injuries getting better/worse over the years?Correlations with changes in the # of practices teams have? Curious what you're looking for as you track these numbers if you don't mind sharing.
I will try to offer some important ACL trends that are significant from the 2013 to the 2021 seasons..............leaving out the 2020 season because of the COVID disruption.
Approximately 2/3rd of ACL tears were sustained during game play, while ~1/3 were sustained during practice. This did not differ by year .. Practice-based injuries were significantly higher in the preseason (~3/5thspractice-based injuries and 2/5ths game-related injuries) relative to the remainder of the season
The distribution of tears in the preseason versus season reveals that just under 50% of ACLs have occurred in the preseason and just over 50% occurred during the season plus postseason.
The most frequent month in which tears were sustained overall was August (~30%) and the most frequent in-season month for tears was October (~15%)
There is a trend that the first month of return to formal game play having the highest proportion of ACL tears. This trend is also been demonstrated in the 1st week of return to TC.
The 5 most frequent positions of players sustaining tears were linebacker (~17%), wide receiver (~15.0%), offensive line (~13%), cornerback (~11%), and running back (~8%). The proportion of tears by player position has essentially not differed by season.
The 2021 NFL Health and Safety data shows that there has been a double-digit increase over each of the past six seasons. In other words, while surgical and rehab techniques continue to improve, ACL tears in the NFL aren't going away. That's because the trend is upward due to bigger, faster players. Conventional wisdom maintains that strengthening leg muscles will protect the knee, but this clearly doesn’t hold true with mass and power increases. No one in athletics is stronger than American football players, yet they rupture their ligaments regularly. The reason is that a person's ACL is proportionate in size to the top of their tibia. So a 6ft tall person has about the same size ligament as another 6ft tall person. We use this fact when selecting donor ligaments and meniscus cartilages to replace the ruptured tissues. However when a six-foot-tall person increases in mass from a normal 200 lbs to 350 lbs of muscle their ligaments do not change size. And a 350 lb football player in 2022 can run nearly as fast as sprinters used to run the 40-yard dash 10 years ago. This gigantic increase in size and speed has led to the rising rate of ACL ruptures we see.
No doubt, the progressively limited offseason and preseason training has increased the numbers of ACLs..........not only preseason game cancellations but also substantial practice schedule changes, including more strength and conditioning sessions, more walk throughs, and delayed live contact and padded practices. This limited training has been shown to progressively increase not only ACL injury risk, but overall NFL injury rates.
Time for recovery following surgery, with only some notable exceptions have remained essentially 9-12 months. And return to play is by no means the same as return to previous performance, which if it all all occurs does not tend to occur before 2 years.
It's important to note that no ACL rupture preventive efforts have been effective. Braces to protect the knee have never worked, despite brace manufacturers’ best efforts to market them as “protective gear.” The braces strap onto the large muscles of the thigh and calf in an attempt to limit ligament rupturing during extremes of motion. The knee joint must bend and rotate to function normally. However, there simply is no external brace that can control the motion of the femur on the tibia without being screwed into the bone itself. Other than using braces for resistance to bruises and providing warmth, athletes in most sports—including skiing—have given them up. Surgeons use them only temporarily in the immediate postoperative period.
I am sure that I haven't covered everything, but it should give you a pretty good overview of what some of the recognizable ACL injury trends are.