Injuries in Brazilian Jiu Jitsu

Recent Study on BJJ Injuries: Analyzing Data from 800 Practitioners

Bumps and bruises are inevitable as we get deeper into our Jiu Jitsu journey.  And as much as we try to mitigate it, there is always a risk of injury requiring lengthy recovery times.  The biggest part of our training is not learning how to win, but how to learn and train safely.  Understanding where the risks lie helps shape our behavior for safer and healthier training.  

A recent master’s thesis by researchers at the Amsterdam University Medical Center collected data from over 800 BJJ practitioners worldwide to find out exactly what causes the most injuries in our sport [00:10]. The findings challenge a lot of common gym wisdom—especially when it comes to the most "dangerous" submissions.

Here is a breakdown of the fascinating results and how you can use this data to stay safer on the mats.

The Most Dangerous Submissions (Spoiler: It’s Not Heel Hooks)

When we think of catastrophic injuries, our minds immediately jump to leg locks. However, the data paints a very different picture:

• Armbars Take the Crown: The submission responsible for the highest number of injuries and the most training days lost is the armbar [00:43]. While elbow pops tend to heal relatively quickly, the worst armbar injuries occurred when the pec tendon was torn from the humerus, leading to a grueling 6 to 9 months of recovery time [01:00].

• The Triangle Trap (For the Attacker!): Triangles came in second on the injury list, but with a bizarre twist. Out of 17 reported triangle injuries, 11 of them happened to the person applying the submission [01:24]. These attacker injuries were often due to poor lock angles and getting stacked, which led to rib, back, and neck issues.

• Calf Slicers: While not incredibly common, calf slicers resulted in the highest average time lost per injury at 70 days [02:09]. Similarly to triangles, the person applying the calf slicer was the one who got hurt in 6 out of the 8 recorded incidents.

• The Heel Hook Myth: Despite their terrifying reputation, inside heel hooks had one of the shortest recovery times. There was only one reported ACL injury from an inside heel hook, and the athlete returned to the mats within 90 days [02:39].

The Most Commonly Injured Body Parts

When analyzing where the body takes the most damage, the lower body takes the brunt of the impact:

• Knees: Nothing comes close to the knee. Knee injuries accounted for nearly 10,000 lost training days across the surveyed athletes [03:21]. These injuries happened across the board: 26% from submissions, 21% from takedowns, and the rest split between guard passing and playing.

• Shoulders: Coming in at number two, shoulder injuries were split evenly, with 30% happening from takedowns and 30% from submissions [03:37].

• Ribs: Rib injuries ranked third. Interestingly, 25% of rib injuries happened from "random stuff" during scrambles, while another 25% occurred while having the guard passed [03:44].

Competition vs. Training Environment

Are competitions really that much more dangerous than a tough night of training at your local gym? Statistically, yes.

• If you compare 1 hour of gym training to a 5-minute competition match, you are 10 times more likely to get hurt in the 5-minute match [04:17].

• In competition, 50% of injuries are directly caused by submissions. In the training room, submissions only account for 20% of injuries [04:00].

• That being said, because practitioners spend exponentially more hours training than they do competing, the vast majority of overall injuries still occur in the training room.

Who is Most at Risk?

The data showed some clear physical and demographic trends regarding who is most likely to get sidelined:

• The "Goldilocks" Zone: Practitioners who weighed over 242 lbs (110 kg), or who had a BMI under 20 or over 30, saw a significantly higher risk of injury [04:54].

• Age and Experience: Being over the age of 40 naturally increases injury risk. However, there is a massive drop-off in injury rates once a practitioner reaches the purple belt level, or roughly 7 years of training experience [05:18]. By this point, athletes likely have the defensive awareness and ego-control to keep themselves safe.

How to Stay Safe on the Mats

To ensure longevity in the sport, creating a safe training room is vital. John Danaher's submission safety rules offer an incredible framework for this:

1. Controlled Extension: You can extend your partner's arm, but never hyperextend it [06:21].

2. The 3-Second Rule: If you can hold a joint in a state of full extension with control for 3 seconds, you've secured the submission and could have broken it. There is no need to rip it [06:21].

Furthermore, the data showed that the vast majority of training injuries happen during free sparring. Transitioning more of your gym time to positional sparring and structured games can drastically lower the injury rate [07:02].

Interestingly, the study noted that "warming up" did not statistically correlate to a lower injury rate [07:14]. However, context is key—younger, highly flexible, and experienced athletes might skip warm-ups entirely and still not get hurt, which skews the data. Always listen to your body and prep it appropriately for the wear and tear of Jiu-Jitsu!

Want to dive deeper into the statistics? Check out the full breakdown in this excellent video by Less Impressed More Involved BJJ: https://youtu.be/x6BGngGC4Xo