Knee pain · MSK ultrasound · Patient guide

What Are the Symptoms of a Meniscus Tear, and How Is It Diagnosed?

Learn what a torn meniscus feels like, when a locked knee needs urgent assessment, what ultrasound can show and when MRI may be needed.

Written by Mr Pedram Aghaei, Medical Writer · MSc Medical UltrasoundClinically reviewed by Mr Paul Watson, Lead MSK Consultant ClinicianPublished and last reviewed: 9 September 2026
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Person holding a painful knee alongside ultrasound imaging used in knee assessment

A meniscus tear isn’t really obvious when it happens.

Let’s say you twisted while getting up out of a squat. It’s a common situation.

There might have been a pop. There might not have been anything dramatic at all.

Then your knee feels strange and swells up overnight and even stiffens.

What do you do then? Most dismiss it as an injury and wait for it to settle.

When it starts catching on the stairs, along the inside of the joint, then it’s worth considering if the meniscus has been affected.

Here’s what a torn meniscus actually feels like, how it gets diagnosed, and how ultrasound can help diagnose it.

What is a meniscus?

The meniscus is a wedge of tough cartilage. There are two menisci in each knee, sitting between your thigh bone and shin bone: one on the inner side and one on the outer side.

Their main function is to spread your body weight across the joint and absorb shock, so the two bone surfaces aren’t grinding directly against each other. They also help keep the knee stable as it bends and twists.

The inner meniscus, called the medial meniscus, is the one that tears most often. It’s more firmly anchored than the outer one, so it has less room to move out of the way when your knee twists.

What are the symptoms of a meniscus tear?

Common symptoms associated with a meniscus tear including joint-line pain, swelling, catching and reduced movement
The symptoms depend on the tear’s position and may develop gradually after a twisting injury.

The symptoms of a meniscus tear depend a lot on where the tear actually happens. Some common ones include:

Pain along the joint line

You can usually run a finger along the crease of the knee and find a sore spot, most often on the inner side.

Swelling that arrives late

Meniscus swelling tends to come up over 24 to 48 hours rather than immediately. Swelling that appears within minutes points more towards a ligament injury or bleeding in the joint.

Catching or clicking

A sense that something is snagging inside the knee as you bend or straighten it.

Giving way

The knee buckles unexpectedly, often on stairs or uneven ground.

Trouble squatting or twisting

Getting down to a low cupboard, or turning while your foot is planted, brings the pain on.

Stiffness

The knee doesn’t quite straighten or bend fully, and it feels tight rather than loose.

When the knee locks

Sometimes a torn fragment of meniscus flips into the joint and physically blocks movement. Your knee gets stuck partway bent and won’t straighten, however hard you try.

This is often called a bucket handle tear, where a long strip of meniscus tears away and folds into the middle of the joint. A knee that’s genuinely locked needs assessing urgently rather than waiting to see how it goes.

Seek urgent help if you have very bad knee pain after a fall or injury, cannot walk or bear weight, have hot swelling, or cannot bend or straighten your leg.

Why does a meniscus tear happen?

There are two different types of meniscus tears and here’s the mechanism behind each:

Sudden injury

Traumatic tears

These happen in a moment: a twist with the foot planted, a heavy squat, a football tackle, or a fall on a bent knee.

They are more common in younger and more active people, and they’re the ones most likely to produce a clear pop and a knee that locks. If yours arrived during sport, a sports injury ultrasound is set up for that kind of assessment.

Gradual change

Degenerative tears

These build up quietly over years. The meniscus dries out and weakens with age, and eventually it splits during something entirely ordinary, like standing up from a low chair.

These become increasingly common from the forties onwards, and they often sit alongside early wear in the knee joint.

This distinction is important since your treatment pathway will be based on the same.

How is a meniscus tear diagnosed?

Clinical and ultrasound assessment of a painful knee following a suspected meniscus injury
Diagnosis begins with history and examination, followed by imaging selected for the suspected structures.

A diagnosis of a meniscus tear usually starts with an examination first.

A clinician bends and twists your knee in specific ways to see whether your pain reproduces, and presses along the joint line.

McMurray’s test

Your knee is bent and rotated while the examiner feels for a click.

Thessaly test

You stand on the affected leg and twist your body over a slightly bent knee.

Joint-line tenderness

The clinician presses along the crease of the knee to identify localised pain.

So an examination is a reasonable place to start, but imaging is what really starts the path to a diagnosis.

A knee that catches, gives way or swells after twisting is worth looking at properly

A knee ultrasound can provide same-day or next-day assessment, with your findings explained on the screen and a written report to follow. No GP referral is needed, and we’re open seven days a week at our Harley Street and St Albans clinics.

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What can a knee ultrasound see?

Especially with meniscus tears, a knee ultrasound can help visualise:

Ligaments and tendons

The medial and lateral collateral ligaments, plus the quadriceps and patellar tendons.

Bursae and fat pad

Bursae around the knee and Hoffa’s fat pad.

Fluid and Baker’s cyst

Fluid in the joint and any Baker’s cyst behind the knee.

Other soft tissues

The iliotibial band and peripheral margins of the meniscus, which form the outer rim.

A probe goes over the knee and produces a live picture while you move. Your scan takes about 20 to 30 minutes.

When MRI may be needed

If ultrasound is insufficient, you may be recommended an MRI to visualise:

  • The central and posterior portions of the meniscus
  • The cruciate ligaments, ACL and PCL
  • The joint cartilage and the bone underneath it
Ultrasound and MRI answer different questions. A knee ultrasound visualises the outer rim clearly but cannot follow the meniscus all the way through the joint. When a suspected tear lies centrally or a surgeon is planning an operation, MRI may be requested.

The benefit of an ultrasound is the accuracy in diagnosing conditions related to a meniscus tear and ones where the symptoms are similar.

A surprising number of knee ultrasounds for suspected meniscal tears end up detecting a Baker’s cyst, a strained medial collateral ligament, patellar tendinopathy or pes anserine bursitis.

Those are all soft-tissue problems; they’re all treatable, and they’re all clearly visible on ultrasound within half an hour.

Waiting weeks for an MRI while your knee keeps catching?

A knee ultrasound gives you a same-week answer on the ligaments, tendons, bursae and any fluid in the joint. If the findings point to the meniscus or cruciates, you’ll know to push for the MRI rather than wondering whether you need one.

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Will a meniscus tear heal on its own?

The healing of a meniscus tear depends entirely on where the tear sits.

Outer third

Red zone

The outer third of the meniscus has a blood supply. Tears there, sometimes called red-zone tears, have a genuine chance of healing, and they’re also the ones most worth repairing surgically when repair is needed.

Inner two-thirds

Limited blood supply

The inner two-thirds have almost no blood supply, and they get their nutrition from the joint fluid around them. Tears in that zone generally do not knit back together.

What improves for most people is the pain and function rather than the tear itself. The knee settles, the swelling goes down, the surrounding muscles take up the slack, and life becomes normal again while the split is still technically there.

But the recovery journey is over months rather than weeks. Small degenerative tears often settle over six to twelve weeks with sensible loading. Larger traumatic tears usually take longer.

What helps during meniscus tear recovery?

Here are some tips that can help during the recovery phase:

Keep moving within comfort

Walking on a torn meniscus doesn’t usually cause further damage, provided the knee isn’t locking or giving way. Complete rest stiffens the joint and weakens the quadriceps quickly.

Build the quadriceps

Strong thigh muscles take load off the meniscus and are the single biggest thing you can control. A personalised rehabilitation programme built around your actual findings will progress faster than a generic knee sheet.

Avoid aggravating movements

Skip deep squatting and twisting while things settle, and be careful on stairs and uneven ground.

Manage swelling

Use ice, elevation and simple pain relief in line with NHS advice.

Use braces appropriately

Braces can help some people feel steadier, particularly if the knee gives way, but they don’t repair anything.

An ultrasound-guided corticosteroid injection can bring down a stubbornly swollen, irritable knee enough to get rehabilitation moving. For degenerative knees where cushioning is the issue, hyaluronic acid joint lubrication is another option to discuss.

It’s always better to get a locked knee looked at now rather than waiting it out.

Why book your knee ultrasound with London Private Ultrasound?

Knee pain after a twist is one of the most common reasons people find themselves stuck.

A knee ultrasound closes that gap for many patients, and when you book with London Private Ultrasound, you get:

Interpreted by the person who scanned you

Every scan here is read by the clinician who performed it, from a consultant-led team combining orthopaedic surgery, MSK ultrasound and radiology.

A detailed report

If your findings point towards the central meniscus, cruciates or cartilage, we’ll say so plainly and put it in writing so you can take it to your GP or consultant.

Treatment in the same building

Rehabilitation programmes, guided injections and orthopaedic assessment are all handled by the Joint Pain Clinic team.

Same-day appointments

Same-day and next-day slots, seven days a week, 9am to 7pm, with no GP referral needed. We’re at 27 Welbeck Street in the Harley Street medical district and 54–56 Victoria Street in St Albans.

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Related services

Knee ultrasound

Assessment of tendons, collateral ligaments, bursae, joint fluid, Baker’s cysts and the accessible peripheral meniscus.

Knee Ultrasound

Sports injury ultrasound

Focused assessment following a sporting injury, including relevant tendons, ligaments and soft tissues.

Sports Injury Ultrasound

Personalised rehabilitation

A progressive recovery plan tailored to the diagnosis, symptoms, activity and treatment goals.

Rehabilitation Programme

Joint Pain Clinic

Specialist assessment, ultrasound-guided treatment and rehabilitation pathways for persistent knee pain.

Joint Pain Clinic

Frequently asked questions

Can you recover 100% from a torn meniscus?

Plenty of people get back to full activity, including sport. Tears in the outer zone can heal because they have a blood supply. Tears further in usually stay, and the knee still becomes comfortable and functional as the surrounding muscles adapt. Recovery is measured in months rather than weeks.

Is it worth fixing a torn meniscus?

For a traumatic tear in a younger person, especially one causing locking, yes. For a degenerative tear, the evidence points the other way. A 2023 meta-analysis of 605 patients found keyhole surgery gave 2.5 points on a 0-to-100 pain scale over non-surgical treatment, with no meaningful difference in function or quality of life at two years.

How much does meniscus tear surgery cost in the UK?

Private knee arthroscopy costs vary widely between hospitals and surgeons, and quotes often separate the hospital fee from the surgeon’s and anaesthetist’s fees. Ask for a full inclusive quotation before committing. Getting a diagnosis first costs a fraction of any surgical quote and tells you whether surgery is even on the table.

Will walking on a torn meniscus make it worse?

Generally no, as long as your knee isn’t locking or giving way underneath you. Staying reasonably active protects your quadriceps strength. Deep squatting, twisting and heavy impact are the things to limit while it settles.

How long does a meniscus tear take to heal?

Small degenerative tears often settle over six to twelve weeks with loading and activity changes. Larger tears and post-surgical recovery take longer. A locked knee needs assessing urgently rather than being given time.

Can a knee ultrasound see a meniscus tear?

It can see the outer margins of the meniscus, and published accuracy figures in experienced hands are good. It cannot follow the meniscus through the centre and back of the joint, so a suspected central tear needs an MRI. A knee ultrasound is excellent for the ligaments, tendons, bursae and fluid that often turn out to be the real cause.

What is a bucket handle tear?

A long strip of meniscus tears away and folds into the middle of the joint, like the handle flipping over on a bucket. It’s the classic cause of a genuinely locked knee, and it needs prompt orthopaedic assessment.

Do I need a GP referral for a knee ultrasound?

No. You can book directly. If you’d like your results sent on to your GP, physiotherapist or consultant, just tell us on the day.

Medical disclaimer: This article provides general patient information and does not replace a medical consultation, examination or personalised advice. Seek urgent assessment for a genuinely locked knee, inability to bear weight, hot swelling, severe pain after injury or rapidly worsening symptoms.
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