Meniscus Surgery
Three different operations hide behind the words "torn meniscus," and their recoveries could not be more different. Here is how to tell which one you are having, and why.
What the meniscus is
You have two menisci in each knee — C-shaped wedges of tough, rubbery cartilage sitting on top of your shin bone, one on the inside of the knee and one on the outside.
Their job is to spread load. The end of your thigh bone is round and the top of your shin bone is nearly flat, so without menisci your body weight would land on a spot the size of a dime. The menisci turn that spot into a broad area. They are the reason your knee cartilage survives decades of walking.
That matters enormously for what follows, because it means meniscus tissue is worth saving whenever we can save it. A knee missing a lot of meniscus develops arthritis faster. Forty years ago surgeons removed the whole thing routinely, and we learned — from those patients' knees — not to do that again.
Two kinds of tear
- A traumatic tear. Something happened — a twist, a bad landing, a fall. Often in a younger person with an otherwise healthy knee, sometimes alongside an ACL tear. These are the tears most worth repairing.
- A degenerative tear. The meniscus frays and splits with age, usually in a knee that already has some arthritis. Often there is no injury at all — people describe standing up from a squat. These behave very differently, and I will come back to them.
Why not everything can be repaired
The meniscus has a blood supply only around its outer rim — roughly the outer third. The inner two-thirds is fed by joint fluid alone.
Tissue with blood can heal. Tissue without blood cannot. So a tear near the outer rim can be stitched and will knit together; a tear in the inner portion will not heal no matter how carefully it is sewn. That single fact decides the operation, and I usually cannot make the final call until I am looking at the tear through the camera.
The three operations
1. Trim (partial meniscectomy)
The torn, unstable flap is trimmed away and the remaining rim smoothed, leaving as much healthy meniscus as possible. This is what we do when a tear cannot heal — and it is the fastest recovery of the three, because there is nothing to protect.
2. Repair
The torn edges are stitched back together so they can heal.
This is always the better outcome when it is possible, because you keep your meniscus. The price is a long, protected recovery — the tissue heals slowly, and it must be protected while it does.
3. Root repair
A root tear is a special case, and it is worth understanding why I treat it so much more seriously. The "root" is where each end of the C anchors into the bone. Those anchors are what stop the meniscus squeezing out sideways when you load it.
When a root detaches, the meniscus is still in there but it stops working. It slides out of the joint under load, and mechanically your knee behaves as though the meniscus were gone entirely. Untreated root tears lead to rapid cartilage loss — arthritis on a fast timeline. That is why we repair the root back to bone, and why that repair gets the most protected recovery of anything on this page.
What the research says — and why we talk it through
Here is something worth understanding. For middle-aged and older patients whose scan shows a degenerative tear in a knee that also has arthritis, several good studies have found that arthroscopic surgery and a proper course of physical therapy tend to end up in a similar place. Both groups improve.
MRI reports add to the confusion, because after about age 50 a great many people have a meniscus tear on the scan and no symptoms at all. A tear on a report does not by itself prove it is the thing that hurts.
None of that means surgery never helps. It means this decision deserves a real conversation rather than being settled by a scan. Research describes averages, and you are not an average — your examination, what your knee actually does day to day, what you have already tried, and what you need to get back to all belong in the decision. That is what we spend the visit on. If we have talked it through and agreed that surgery is right for your knee, none of this is a reason to second-guess it. It is the reason we took the time.
The picture is clearer when your knee locks, catches, or gives way — a piece of meniscus physically caught in the joint. That is a mechanical problem, and arthroscopy is genuinely good at mechanical problems.
How the operation goes
- Anesthesia. Usually a general anesthetic, often with numbing medicine in the knee. You go home the same day.
- Two small punctures at the front of the knee — a camera through one, instruments through the other.
- Look at the whole joint. The cartilage, the ligaments, both menisci. What I find here decides the rest.
- Trim or repair. If the tear can heal, it gets stitched. If it cannot, the unstable portion is trimmed and the rim smoothed. I save what I can.
- Close. A stitch or two per puncture, and a soft dressing.
I will tell you afterward exactly what I found and what I did, because that determines everything about your recovery. If there is any chance of a repair, we discuss both recoveries beforehand so you are not surprised.
Recovery: the three paths
After a trim
- First weekFull weight bearing straight away. Crutches only if you want them. Keep the incisions dry 48 hours. Ice and elevate. Aspirin 81 mg twice daily for two weeks.
- 2–6 weeksMost people are back to ordinary activity in this window. Most do not need formal therapy — call us if you would like some. Swelling settling is the pace-setter.
After a repair
- First 6 weeksYou may put weight on the leg with the brace locked straight. When you are not standing on it, bend from 0 to 90 degrees as pain allows — but do not force it deeper. Therapy starts a few days after surgery.
- 6–12 weeksBrace comes off, strengthening builds, but still no deep loaded bending.
- 12 weeksDeep squats and lunges under load are finally allowed. Return to sport comes after that, on your therapist's testing.
After a root repair
- First 6 weeksStrictly no weight on that leg — none. A single misstep can undo the repair. A hinged brace stays locked straight for walking and for sleeping; you may unlock it a little while sitting awake. No bending past 90 degrees for the first four weeks. And no working the hamstrings, because they attach to the very part of the meniscus we just repaired. Therapy starts around two to three weeks.
- 7–11 weeksWeight comes back gradually and strengthening begins in a protected range.
- 3–6 monthsProgressive return to full activity.
Six weeks without putting a foot down is genuinely hard, particularly on a ranch or a job site. Plan for it before surgery — help at home, a knee scooter, time off. It is the single biggest predictor of whether a root repair works.
The risks, honestly
- The repair does not heal The main risk of a repair or root repair. Rates vary with the tear and your age, and a failed repair sometimes needs a second operation to trim what would not heal.
- Ongoing pain from arthritis If your knee has arthritis alongside the tear, fixing the tear does not fix the arthritis. This is the most common reason a technically perfect operation leaves someone disappointed.
- Blood clots Uncommon after arthroscopy but the reason for the aspirin and for staying active.
- Infection Rare with punctures this small.
- Stiffness More of an issue after the protected recoveries than after a trim.
- Arthritis later Every bit of meniscus removed raises the long-term odds. It is the reason I repair when I can and trim conservatively when I cannot.