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I tweaked my right knee in a scramble about four years ago, and for a while I figured that was it for my BJJ. Couldn’t squat without it barking, couldn’t shrimp without wincing, definitely couldn’t sit in butterfly for more than thirty seconds. But I kept training, and I’ve kept training since, because it turns out doing BJJ with bad knees is mostly a problem of strategy, not willpower. You don’t quit. You change how you move and what you let your partner do to you.
This isn’t about whether you should see a doctor — go see one, get the actual diagnosis, and listen to them over me. This is about what I’ve actually changed on the mat to keep rolling six days out of the week in my late thirties with a knee that will never be twenty again.
Training BJJ with bad knees starts with knowing what your knee hates
The single most useful thing I did was figure out the specific movements that flared my knee up, instead of treating “my knee hurts” as one big undifferentiated problem. For me it was three things: deep flexion under load (think a heavy guy stacking me with my heel jammed into my butt), any twisting force when my foot was planted, and lateral pressure on the joint from the outside.
Once I named those, I could see them coming. Most knee injuries in jiu-jitsu aren’t dramatic — they’re the slow accumulation of a hundred small bad positions you didn’t have to be in. Spend a week just paying attention. After class, jot down what hurt and what you were doing when it happened. You’ll find a pattern within a couple of sessions, and that pattern is your actual training plan.
Tap early to leg locks, and tap to position too
If you train anywhere near modern no-gi, heel hooks and knee bars are part of the game now. With a healthy knee you have a little buffer to work out of a leg entanglement. With a bad knee you have zero. I tap the instant someone establishes a serious leg entanglement on my bad side — not when it hurts, when it’s locked in. The ego cost of an early tap is about three seconds. The cost of a blown ACL is a year.
I also tap to position, which younger guys think is weird. If I’m folded into a stack pass and I feel that deep-flexion pressure building, I’ll give up the pass and reset rather than fight to keep my guard. Losing a position in training is free. I’d rather “lose” forty rounds a month than miss six months.
Build a game that keeps weight off your knees
This is where adapting your game actually pays off. A lot of standard guard work hammers the knees — playing a tight closed guard, spider guard with the legs loaded, anything where you’re posting hard off a bent knee to recover. I moved my game toward positions that load the hips and the spine instead of the knee joint.
- Half guard, especially a knee-shield or Z-guard. You’re on your side, the bottom leg isn’t bearing crushing flexion, and you can frame with the shin instead of the joint. I lean on this hard now and broke down the mechanics in our half guard guide and side control breakdown.
- Seated guard over butterfly hooks under load. Butterfly is fine until someone drives forward and pins your shin into a deep angle. Sitting up and managing distance with your hands keeps you out of that.
- Underhooks and the back. The safest place for a cranky knee is behind someone, riding hooks lightly, not in a leg-entanglement war out front.
The theme is the same one I keep coming back to in the BJJ after 40 pillar: stop playing the explosive, leg-dependent game the 22-year-olds play, and build the patient, frame-heavy game that ages well.
Protect the knee with sleeves and smart taping
A good knee sleeve does two things for me. It keeps the joint warm, which genuinely matters — a warm knee tolerates load better than a cold one — and the compression gives me a little proprioceptive feedback so I’m more aware of the joint’s position. It is not a brace and it won’t stop a heel hook, so don’t train recklessly because you’re wearing one. I went deep on which ones actually hold up to rolling in my best knee sleeves for BJJ roundup, so I won’t repeat all of it here.
If you’ve got real instability — the knee shifting side to side under load — that’s a hinged-brace and a doctor conversation, not a sleeve. Know the difference.
Warm up like the knee is the point
I used to jog two laps and call it warmed up. Now I spend ten minutes specifically on the lower body before I touch a partner: slow bodyweight squats to a depth that doesn’t bark, leg swings front-to-back and side-to-side, a few sets of Spanish squats or a wall sit to wake up the quads, and some easy ankle circles because stiff ankles make the knee do extra work. Cold knees are where I’ve gotten hurt. Every single tweak I can remember happened in the first five minutes of a round when I hadn’t properly prepared the joint.
Off the mat, the best thing I’ve done for my knees is get the surrounding muscles strong — quads, hamstrings, glutes, and the often-ignored stuff around the hip. A strong leg shares load that a weak leg dumps straight onto the joint. Nothing fancy: split squats, step-downs, hamstring curls, and hip work, twice a week.
Manage the recovery, not just the session
A bad knee doesn’t just hurt during training, it hurts the next morning, and how I handle the hours after class decides whether I’m rolling again in two days or limping for a week. I keep moving on rest days — walking, easy cycling, nothing that lets the joint stiffen up and pool fluid. I elevate and ice if it’s puffy after a hard session, and I’m honest with myself about skipping a day when it’s genuinely angry rather than just stiff. There’s a difference between soreness and a warning, and learning to tell them apart is most of the game. I put the rest of my between-sessions routine in how to recover faster between BJJ sessions.
FAQ
Can I still do BJJ if I’ve had knee surgery?
Plenty of people roll for years after ACL reconstructions and meniscus repairs — but only your surgeon and physio can clear you, and only after you’ve rebuilt strength and range of motion. When you do return, treat it like coming back from any layoff: start light, communicate with partners, and stay out of leg entanglements until you trust the joint again.
Should I wear one knee sleeve or two?
If only one knee is the problem, one sleeve is fine, but a lot of us wear two anyway for symmetry and to keep both joints warm. It also stops you from telegraphing which side is the bad one to a switched-on training partner.
Are leg locks too dangerous to train with bad knees?
You can train the entries and defense, but tap absurdly early and pick training partners who have control. The danger isn’t the technique, it’s a spazzy partner cranking through a position before you can react. Drill them cooperatively before you ever let them happen live on your bad side.
How do I know if it’s just soreness or a real injury?
Soreness is dull, fades over a day or two, and warms up as you move. A real injury tends to be sharp, localized, often comes with swelling or instability, and gets worse with use rather than better. If it’s swelling, locking, or giving way, stop guessing and see someone.
You don’t have to quit
The grapplers I know who lasted into their forties and fifties almost all train around something — a knee, a shoulder, a back. The ones who quit are usually the ones who tried to keep playing their twenty-five-year-old game until the joint made the decision for them. Name what your knee hates, build a game that respects it, warm up like it matters, and tap before pride costs you a year. That’s the whole thing. I’ll see you on the mats.