Why judo injuries happen the way they do
Judo has two distinct injury mechanisms, and they need different thinking.
The first is impact. Being thrown is a controlled collision, and even a perfect breakfall transmits real force through the shoulder, arm and torso. Multiply that by fifty throws in a nage komi session, four times a week, for years.
The second is grip fighting — a slow, sustained, isometric war fought entirely through the fingers, wrists, elbows and shoulders. Judo places among the highest loads on the hands of any sport, and the resulting finger joint damage is largely cumulative and largely permanent if it isn't managed early.
Add the specific danger positions — the planted standing leg in uchi mata and harai goshi, the hyperextension of juji gatame, the shoulder in a countered throw — and you get a very predictable injury list.
Judo injuries we treat, by mechanism
Shoulders — breakfalls, throws and counters
AC joint sprains from landing on the point of the shoulder. Dislocations and subluxations from posting out to break a fall or from being countered mid-throw. Rotator cuff and labral injuries from repeated grip-fighting load and impact.
Knees — the planted standing leg
ACL injuries from the standing leg being planted and rotated during uchi mata, harai goshi and o soto gari, particularly when the throw is countered or defended mid-entry. MCL injuries from foot sweeps and from being blocked. Meniscal injuries from twisting under load.
Elbows — juji gatame
Hyperextension of the ulnar collateral ligament and flexor origin from armbars, and from the defence of them. The classic judo elbow, and it recurs readily if extension capacity isn't rebuilt.
Fingers, hands and wrists — kumi kata
The most common judo complaint by a wide margin. Collateral ligament sprains and PIP joint injuries from sleeve and lapel grips. Progressive joint thickening and lost range from years of grip fighting. Wrist sprains from breakfalls and from posting.
Lower back — entries and lifting
Lumbar overload from repeated throw entries, from kuzushi against a resisting opponent, and from lifting throws. Disc irritation from bending and rotating under load.
Neck — being thrown and newaza
Cervical strain from impact and from failing to tuck properly in a breakfall. Compression and rotation load from shime waza defence and groundwork.
Ribs and torso
Contusions and costochondral irritation from landing and from newaza pressure.
Ankles and feet
Sprains from foot sweeps, ashi waza exchanges, and from the standing foot being trapped.
Ears
Auricular haematoma from newaza friction. Needs draining by a doctor within about 48 hours or it sets permanently.
The elbow that never quite comes back
Juji gatame hyperextends the elbow, straining the ulnar collateral ligament and the flexor tendon origin. The damage often happens during the defence rather than the submission — resisting the extension for a few seconds too long.
What makes it recur is that most people rest it until it stops hurting, then go straight back to randori. Rest restores comfort but not capacity. Unless end-range extension is deliberately loaded and rebuilt, the joint goes back onto the mat with the same tolerance it had when it was injured.
Realistic return timelines
These are typical ranges. Yours is assessed individually at your first appointment.
| Injury | Modified training | Full randori |
|---|---|---|
| Finger / PIP sprain | 3–10 days (taped) | 2–6 weeks |
| Neck strain | 3–10 days | 2–5 weeks |
| Wrist sprain | 1–2 weeks | 3–8 weeks |
| Rib contusion | 1–2 weeks | 3–6 weeks |
| Elbow hyperextension / UCL strain | 1–2 weeks | 4–10 weeks |
| AC joint sprain (grade 1–2) | 1–2 weeks | 4–8 weeks |
| Ankle sprain (grade 1–2) | 1–2 weeks | 3–8 weeks |
| MCL sprain (grade 1–2) | 1–3 weeks | 4–10 weeks |
| Shoulder dislocation (first-time) | 3–6 weeks | 12–20 weeks |
| ACL rupture (post-surgical) | 4–8 weeks | 9–12 months |
Junior athletes generally sit at the longer end of these ranges. Every case is assessed on its own.
Return to randori, in stages
Judo has a progression built into how it's already taught, so we use it.
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Ukemi tolerance
Can you breakfall without pain? If not, nothing above this stage is safe. This is the stage most people skip.
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Uchi komi
Fitting in without throwing. Low load, controlled, avoiding the injured mechanism.
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Nage komi
Throwing with a cooperative partner. Start as tori, not uke.
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Light randori
Chosen partners, agreed restrictions, reduced intensity.
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Full randori
Unrestricted, full pace.
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Shiai
Competition intensity, adrenalised.
Deal with your hands before it's too late
Taping gets you through the session. It doesn't change the load that's damaging the joint.
If your fingers are thickening or stiff between sessions, the balance between grip load and recovery is wrong, and it needs assessing properly — grip mechanics, training volume, and the wrist and forearm contribution.
This one is genuinely urgent. The joint changes from years of kumi kata are largely permanent once they've set.
A note for parents of junior judoka
Judo has a large junior population, and growing athletes injure differently to adults. Growth plates, apophyseal sites at the knee and heel, and rapidly changing limb proportions all change what a given force does to a body.
We assess juniors accordingly and are conservative about return-to-contact timelines with them. If you're booking on behalf of a child, mention their age and training volume when you book.
Why here
Dr Luke Smith is a BJJ black belt who cross-trains judo, wrestling, boxing, Muay Thai and MMA. Nick Mann holds black belts across six martial arts.
We're inside Renegade MMA in Kensington, so the assessment can happen with a gi on, in the grip or the entry that caused the problem.
Frequently asked questions
How long after a judo shoulder dislocation can I do randori?
A first-time dislocation typically needs three to six weeks before modified training and twelve to twenty weeks before full randori, depending on the structures involved and how the shoulder responds to rehab. Returning early is the single biggest predictor of recurrence, and each recurrence makes the next more likely.
Why does my elbow hurt after armbars?
Juji gatame hyperextends the elbow, straining the ulnar collateral ligament and the flexor tendon origin. The damage often occurs during the defence rather than the submission — resisting the extension for a few seconds too long. It recurs easily unless end-range extension capacity is deliberately rebuilt, not just rested.
What can I do about grip-fighting finger damage?
Taping helps in the short term, but persistent thickening and stiffness means the load and recovery balance is wrong. Assessment should cover grip mechanics, training volume, and the wrist and forearm contribution. Managing this early matters, because the joint changes from years of kumi kata are largely permanent once established.
Can I train judo with a knee injury?
Often yes, with modifications. Groundwork, uchi komi on the uninjured side, and conditioning frequently continue while throwing and randori are paused. What's safe depends on which structure is involved — a suspected ACL injury means no randori until it's been properly assessed.
Is it safe for my child to keep doing judo after an injury?
It depends on the injury and where they are in growth. Growing athletes have vulnerable growth plates and apophyseal sites that adults don't, so timelines are typically more conservative. Bring them in for assessment rather than working to an adult timeline.
Do I need a referral to book?
No. Osteopaths are first-contact practitioners in Australia, so you can book directly. A referral is only needed for funding pathways like a Medicare care plan, DVA or WorkCover.
Get thrown, get up, keep going
Kensington clinic, inside Renegade MMA at 92 Parsons Street. Monday to Friday 7:30am–7pm, Saturday 7:30am–5pm.