Fingers, neck, knees: the three areas most talked about and least understood
Plenty of certainties circulate at the gym about these three areas. Only one of them is backed by solid data; on the other two the research simply is not there.
BJJ Square · Updated on 08/11/2026
Careful We describe what research has measured, not what to do about your case. Pain that keeps coming back in the same place should be looked at by a professional.
The knee: here the data exists
It is the most affected area in training, around 25% of injuries across three independent studies. The documented mechanisms are specific: the meniscus is damaged mainly in takedowns and guard passes; the anterior cruciate ligament in 36% of cases during a takedown, specifically in the person being taken down; ankle ligament injuries come 61% of the time from submissions — toe holds, straight ankle locks and heel hooks.
It is also the area with the longest return times: among those who tore their ACL, half were back to sparring after nine months or more.
Fingers: the most affected area and the least studied
In a study of 140 practitioners — a different and much smaller sample than the ones above — the hand and fingers come out as the single most affected area, at 14.4% of injuries. In that same study the knee stops at 9.2%: the two figures do not contradict each other, they are rankings built on different samples. But one detail explains a great deal: they are also the injuries most often self-diagnosed and least often taken to a doctor. Fingers hurt, they swell, you live with it.
Careful ⚠️ On finger arthritis in BJJ practitioners there is no study at all. None. The only research on the subject covers eight judoka, followed for sixteen years in a study from 1998: all eight showed degenerative changes in the fingers, with mild symptoms relative to what the radiographs showed. Eight people, a different sport, almost thirty years ago. It is not a basis for saying that jiu-jitsu wrecks your fingers, and not a basis for saying it does not either.
Note The same goes for the pulleys — the structures that hold the tendons against the fingers: there is no literature on BJJ. Every study concerns climbing, where the grip is biomechanically different from gripping a kimono. The data does not transfer.
The neck and chokes
The largest survey in existence gathered 4,421 responses, 4,307 of which were analysed. The numbers: 27.8% report having been choked unconscious at least once, and of those 77.6% report no lasting symptoms. Around 20% describe something — headache, dizziness, difficulty concentrating — generally resolving within an hour. Persistent symptoms in two people out of 4,307: 0.05%.
The authors conclude that sport chokes can be considered safe on the basis of how rare persistent symptoms are. That is the conclusion of the research, and it should be reported in full.
Careful ⚠️ But the rest has to be reported too, and the authors state it themselves: it is a self-reported questionnaire collected online, with no follow-up over time, no instrumental testing and no cognitive testing. And above all: there is no longitudinal study on the effects of repeated choking. The question “what happens after twenty years” has no scientific answer, in either direction.
There is also a series of ten documented cases of neck artery dissections and strokes associated with sport chokes: nine people survived, three went back to grappling. ⚠️ It is a case series, not an incidence study: it says the event exists, not how often it happens. It does not allow any risk to be calculated.
What you can take from this
That on the knee you can reason with numbers, on the fingers almost not at all, and on the neck we have one reassuring snapshot taken once, with nobody going back to look afterwards. Anyone selling you certainties about the latter two is going beyond what is known.
The one action that reduces exposure more than any other: tapping early.
Frequently asked questions
- Does jiu-jitsu wreck your fingers?
- Nobody knows: there is no study on finger arthritis in BJJ practitioners. The closest research covers eight judoka followed for sixteen years in a study from 1998, which showed degenerative changes in all eight but with mild symptoms. Eight people, a different sport.
- Are chokes bad for the brain?
- The largest survey, of 4,307 analysed practitioners, reports persistent symptoms in two cases: 0.05%. But it is a self-reported questionnaire with no follow-up and no instrumental testing, and there is no longitudinal study on the effects of repeated choking.
- Which BJJ injury has the longest recovery?
- Among those documented, the anterior cruciate ligament tear: half of the athletes were back to sparring after nine months or more.
- How do knee injuries happen in jiu-jitsu?
- The meniscus mainly in takedowns and guard passes; the anterior cruciate ligament in more than a third of cases during a takedown, generally in the person being taken down. Ankle ligament injuries, by contrast, come 61% of the time from leg submissions.
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