Raw cabbage on the knee, two hours a night

Two randomised trials, 141 patients between them, and one comparison that settles it.

Videos of white cabbage leaves bandaged over an arthritic knee are going round again, with a claim about drawing inflammation out of the joint. The wrap has been tested twice on knee osteoarthritis, in Germany and in Thailand. Both trials found something. Neither found what the videos claim.

⚡ 10-Second Pulse

Have you ever put food on a sore joint?

🥦 Yes, tried it 🧊 Ice only 🙅 Never

The first trial ran at a hospital in Essen and enrolled 81 people with knee osteoarthritis, average age 66. One group bandaged a cabbage leaf over the knee for at least two hours a day. One group used diclofenac gel. One group changed nothing. After four weeks the cabbage group scored 12 points lower for pain on a 100-point scale than the group that changed nothing, and sat level with the gel group.

The second ran in Bangkok in 2022, with 60 patients whose knees were further gone, grades 3 and 4. Cabbage went on for one hour a day. The comparison arm here was not a drug: it was a reusable cooling gel pad, 20 minutes a night. Cabbage and the cold pad finished in the same place, and both came out ahead of the diclofenac arm.

The cold pad is the comparison that settles it. A leaf out of the fridge is a cold compress that happens to be a vegetable. Neither trial used a fake leaf, so every patient knew which group they were in, and expectation moves pain scores. The plant compounds the videos name are a proposed mechanism in both papers, not a measured one. My verdict: the wrap may help, and frozen peas may get you there in a third of the time.

patients, Essen trial

2 hrs

a day on the knee

12 pts

below no treatment

Two hours was the dose behind the German result. Under-dosing is how kitchen remedies fail at home: ten minutes of leaf on a knee tests nothing.

Watch the gel arm, not the leaf. The Bangkok patients on diclofenac had to rub it in four times a day, against one application for the cabbage. A four-a-day schedule is easy to miss, so part of that gap may be adherence rather than chemistry. One caution on the wrap itself: skip it if the skin over the knee is cut, cracked or rashy, and take the leaf off if the skin reddens underneath.

✅ Tonight’s Test

Run the leaf against a cold pack. Peel two or three outer leaves off a white cabbage, chill them, and flatten the thick ribs with a rolling pin so the leaf lies flat on the joint. Lay them over the knee, hold them on with cling film wrapped once, and leave it an hour with the leg up. The next night, use frozen peas for 20 minutes instead. Score the knee out of ten each morning and keep whichever wins.

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More Knee Wins

●	Cold after, warm before. A knee that is puffy after activity settles under cold. A knee that is stiff first thing moves better after warmth. Put the wrap on in the evening and keep heat for the ten minutes before a walk.
●	Get the leg up while you wrap. An hour with the foot on a stool drains a swollen knee better than an hour with the foot on the floor. Same hour, more back from it.
●	Contact beats coverage. Both trials held the leaf against the skin for the whole session. Loose gauze slides off in ten minutes. One turn of cling film, snug but not tight enough to leave a mark, keeps it where it belongs.

Quick Vote

What goes on the knee tonight?

🥦 The cabbage leaf

🧊 The frozen peas

From the Mailbag

“My daughter says this is an old wives’ tale. Two hours a night is a lot to give a placebo.”

Diane, 62

Placebo is the right worry, Diane, and neither trial ruled it out. There was no dummy leaf, so everyone knew what was on their knee. What the trials do show is a wrap group finishing below the group that changed nothing and level with a diclofenac gel, with two adverse events logged in each active arm in Essen. If two hours is too much, the Bangkok protocol was one hour. And if a cold pack gets you the same number in 20 minutes, use the cold pack.

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Keep moving,

The Ache Report

P.S. Write the number down. Score the knee out of ten before you wrap it and again at the same hour the next morning. Impressions drift across a week; a written number does not.

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Raw cabbage on the knee, two hours a night

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