Medial meniscus tear

What is a medial meniscus tear?

The meniscus is a crescent-shaped fibrocartilage cushion in the knee joint. The knee has two menisci: the medial (internal meniscus) and the lateral (external meniscus). The medial meniscus is fused to the joint capsule and the inner ligament, making it less mobile and generally more susceptible to injuries.

A tear can occur acutely and traumatically (e.g. twisting during sports) or degeneratively due to wear and tear. The shape, location and stability of the crack (e.g. longitudinal crack, radial crack, horizontal, basket handle crack, root crack) determine the symptoms and the procedure. Important: Not every torn meniscus requires surgery. Symptoms can often be resolved very well conservatively.

Anatomy and function of the medial meniscus

Menisci increase the contact area between the femur and tibia bones, distribute loads, stabilize the joint and act as shock absorbers. The medial meniscus has a C shape and is fixed to the capsule and the medial ligament (MCL).

• Zone classification according to blood flow: red zone (well supplied with blood), red-white zone (borderline), white zone (hardly supplied with blood).
• Anterior and posterior roots (meniscus roots) anchor the meniscus to the shinbone.
• The meniscus posterior horn and posterior horn capsule (ramp region) are particularly susceptible to injury in twisting trauma and cruciate ligament injuries.

Blood circulation is crucial for the chances of healing: tears in well-supplied peripheral zones can – depending on their morphology and stability – heal conservatively or be sutured surgically. In the white zone, spontaneous healing is less likely; Nevertheless, conservative strategies are often successful in alleviating symptoms.

Causes and risk factors

• Acute trauma: twisting under load, abrupt stop-and-go, deep squatting with twisting movements (e.g. soccer, tennis, skiing).
• Degenerative: age- or stress-related changes in the fibrocartilage, often without any remembered trauma.
• Accompanying factors: X-leg/bow-leg axes (especially varus for medial), excess weight, occupational knee strain (kneeling, squatting), previous knee injuries.
• Ligament instabilities, particularly the anterior cruciate ligament (ACL), increase meniscal stress.
• Meniscus root tears can occur during everyday movements and often lead to meniscus extrusion and increased joint stress.

In the case of degenerative tears, stress-related inner side pain and recurring swelling are often the main symptoms. Traumatic tears are more likely to present with sudden pain, feelings of entrapment, or blockage.

Typical symptoms

• Pain in the inner joint line, increased when turning, squatting or going down stairs.
• Swelling/joint effusion after stress.
• Entrapment or snapping phenomena, occasionally blockage due to cracks in the basket handle.
• Feeling of stiffness, limited flexion/extension.
• Pain when exercising or walking for long periods of time.
• Sometimes nocturnal pulling, starting pain.

Not every crack causes severe discomfort. Incidental findings in MRI are possible - clinical correlation is crucial.

Initial measures for acute complaints

• Reduce strain and avoid movements that cause pain.
• Cool at intervals (e.g. 10-15 minutes), protect skin.
• Compression bandage and elevation to reduce swelling.
• Short-term painkillers as needed and tolerated (e.g. paracetamol or NSAIDs after consultation).

Early medical evaluation makes sense if there is severe pain, significant swelling, unsteadiness in the knee or a blockage.

Diagnostics: anamnesis, examination, imaging

Diagnosis is based on careful clinical examination and, if necessary, imaging. Important tests include: Joint space palpation, McMurray and Thessaly test. An inspection for axial deviations, ligament stability (inner ligament, cruciate ligaments) and range of motion is essential.

• X-ray: assessment of the bony structures and signs of arthrosis, especially a. for complaints that have existed for over 40 years or longer.
• MRI: Highly informative for meniscus morphology, root tears, accompanying injuries (ligaments, cartilage).
• Sonography: assessment of effusion/soft tissue; Meniscus assessment only limited.
• Diagnostic arthroscopy: today rarely used primarily to confirm the diagnosis, only for specific questions.

It is important to distinguish it from other causes of medial knee pain, such as medial knee ligament strain, retropatellar pain syndrome, bone marrow edema or medial gonarthrosis.

Conservative therapy: the first step

For many medial meniscus tears - especially degenerative, stable or smaller tears without significant mechanical blockages - structured conservative treatment is the method of first choice. The aim is to reduce pain and swelling, maintain or restore knee function and optimize neuromuscular control.

• Activity adjustment: temporarily avoid twisting movements in deep flexion, gradually increase the load.
• Physiotherapy: quadriceps and hamstring strengthening, hip and trunk stability, leg axis control, sensorimotor training, flexibility and gliding mobilization.
• Pain and inflammation management: cooling, if necessary short-term NSAIDs/topical preparations as recommended by a doctor.
• Aids: Temporary knee-relieving tape/soft orthosis; In the long term, what counts is muscular stability.
• Weight management: Every kilogram less reduces the strain on the joints.
• Everyday and workplace ergonomics: knee-friendly lifting and squatting techniques, breaks during kneeling activities.

Injections can be considered in selected cases: corticosteroid (short-term reduction of inflammation and pain, especially in synovitis), hyaluronic acid (inconsistent evidence), platelet-rich plasma/PRP (partly promising for degenerative meniscus lesions, but not standard). Such options are considered individually and discussed transparently.

A conservative treatment attempt over several weeks to a few months is common. The clinical course, functional gain and your personal activity goals are decisive.

Surgical therapy: joint preservation before resection

Operations are useful for medial meniscus tears when conservative measures have been exhausted and symptoms persist, or when certain types of tears lead to mechanical problems. The goal of modern meniscus surgery is to preserve meniscus tissue whenever possible.

• Meniscus suture (repair): For fresh, blood-saturated tears (e.g. longitudinal tears in the red/red-white zone), unstable flap or basket handle tears. Different techniques (inside-out, outside-in, all-inside).
• Partial resection (partial meniscectomy): Only for non-repairable tears with persistent mechanical symptoms. As gentle as possible on the tissue to reduce the risk of osteoarthritis.
• Root repair: For meniscus root tears to restore force transmission; more frequent partial weight-bearing regimen postoperatively.
• Accompanying corrections: In the case of severe bow-leg misalignment (varus) and medial compartment overload, an adjustment osteotomy close to the knee can be considered in specialized cases to relieve the load.

Possible risks of any operation include: Infection, thrombosis, bleeding, nerve irritation, stiffness, persistent pain or new rupture. A surgical decision is always made based on a risk-benefit assessment, tear morphology, activity level and individual goals.

Rehabilitation and return to everyday life and sport

• After conservative therapy: gradually increase the load; Focus on strength, coordination, leg axis. Daily resilience can often be achieved within a few weeks.
• After partial meniscectomy: early functional mobilization, rapid full weight bearing is usually possible. Office work often after 1-2 weeks, sports depending on the discipline after 4-8+ weeks.
• After meniscus suture/root repair: partial weight-bearing (e.g. 15-20 kg) and movement limits in the first few weeks, splint depending on the protocol. Sport-specific training after 3-4 months at the earliest, return to pivot sport usually after 4-6+ months.

The exact rehabilitation depends on the findings and procedure. A structured, stage-based program with follow-up is important to avoid overuse and meet safe criteria for return to work and sport (e.g. pain-free full extension/flexion, strength symmetry, functional testing).

Prognosis and long-term perspective

Many patients achieve good symptom control and resilience with conservative therapy. After repair operations, cracks can heal; The success rates depend on the shape of the tear, blood flow, accompanying injuries and quality of rehabilitation. After partial resections, pain often decreases quickly, but in the long term the risk of cartilage wear is increased - therefore preserving the meniscus is a priority wherever possible.

• Degenerative cracks: often easy to control conservatively, relapses possible.
• Traumatic, repairable tears: with adequate sutures and rehabilitation, good chances of sporting resilience.
• Root cracks: require careful indication; If left untreated, there is a risk of compartment overload.

Close supervision, training of the leg axis and adjustment of the load contribute significantly to a good long-term result.

Prevention and everyday tips

• Sufficient warm-up and technique-appropriate landings/turning movements in sports.
• Strength building quadriceps, hamstrings, gluteal muscles; Core stability.
• Coordination/proprioception (e.g. balance exercises).
• Avoid deep squatting with rotation and load if possible; Lift loads close to your body.
• Suitable shoes, if necessary insoles according to individual indications.
• Weight management and breaks during kneeling activities.

Pre-existing ligamentous instabilities or axial deviations should be addressed to reduce meniscus loading.

Special situations

• Athletes: The goal is a safe return to sport. Criteria-based rehabilitation and sport specifics are more important than rigid timelines.
• Older age: Degenerative cracks are often accompanied by cartilage changes; Conservative therapy is the priority here.
• Combined injuries (e.g. ACL tear): Meniscus and ligament care are planned together to optimize stability and healing.
• Varus axis and medial overload: In selected cases, axis correction can be discussed.

Regenerative procedures such as PRP can also be considered if classic measures are not sufficient. Clear indications and realistic expectation management are crucial.

When should you see a doctor?

• Acute inner side pain with swelling after twisting trauma.
• Feeling of instability or recurring entrapments/blockages.
• Persistent symptoms despite rest and personal measures for several weeks.
• Fever, redness, severe pain at rest (rule out infectious or other rare causes).
• Newly occurring stretch inhibition.

Early diagnosis helps to choose the appropriate treatment that is as gentle as possible.

Common Mistakes and Myths

• Immediate surgery without conservative attempts – often not necessary unless there are clear mechanical problems.
• Longer complete protection – leads to loss of strength and stability; better dosed, guided activation.
• All cracks do not heal - wrong: clinical relief of symptoms and functional stability can often be achieved conservatively.
• “Cracking” automatically means damage – not necessarily. More relevant are pain, blockages and loss of function.

Related topics

Depending on the type of tear and findings, the following pages may be helpful: Lateral meniscus tear, basket handle tear, degenerative meniscus lesion, post-meniscectomy syndrome.