Degenerative meniscus lesion

Meniscus: structure, function and what happens when it degenerates

The menisci are crescent-shaped fibrocartilage discs between the femur and tibia bones. There is an internal (medial) and external (lateral) meniscus. They distribute loads, increase joint surface congruence, stabilize the knee and act as shock absorbers.

Only the outer edge of the meniscus is well supplied with blood; the inner zone is avascular. This explains why degenerative fiber tears and thinnings in the inner zone heal poorly or not at all biologically. In degenerative lesions, the tissue frays, meniscus extrusion (migrating out) and microtears can occur - often together with cartilage wear.

• Medial meniscus: more often degeneratively affected, especially in cases of mild bowleg axis (varus).
• Lateral meniscus: less commonly degenerative, but important for rotational stability.
• Blood circulation: only the outer “red-red” zone has healing potential.

What is a degenerative meniscus lesion?

The term describes wear-related changes to the meniscus tissue - from small tears to horizontal fiber separations to complex tear patterns. The trigger is usually a combination of age, everyday and occupational stress, leg axes, excess weight and accompanying cartilage degeneration. A single event is often not memorable.

Important: Imaging (e.g. MRI) shows meniscal changes in many people aged 40-50 and over, even without symptoms. The clinical classification of the symptoms is therefore crucial - not just the findings.

Typical symptoms

• Pain on exertion in the knee joint gap (often on the inside).
• Start-up pain, later also pain when walking for long periods or going down stairs.
• Occasional swelling or irritants in the knee.
• Sensation of stiffness, sometimes snapping or rubbing.
• Rarely true sensation of pinching; A “blocked” knee is more likely to indicate special types of cracks (e.g. basket handles).

Symptoms vary with activity, daily form and comorbidities (e.g. osteoarthritis, axial deviation).

Causes and risk factors

• Age and tissue wear: decreasing fiber quality of the meniscus.
• Repetitive stress: squatting, kneeling, heavy lifting, jerky twisting movements.
• Axis deviations: Bow-leg (varus) puts strain on the medial meniscus, X-leg (valgus) puts strain on the lateral meniscus.
• Excess weight: increases the load on the joints and meniscus.
• Previous injuries: ligament insufficiency, previous partial meniscectomy.
• Beginning of gonarthrosis and cartilage damage.
• Metabolic factors and lifestyle (e.g. smoking) can influence tissue quality.

Diagnostics: step by step

An ultrasound can reveal accompanying effusions or Baker's cysts. Warning signs such as acute blockage after twisting trauma or significant instability require prompt clarification.

Differential diagnoses

• Knee osteoarthritis (gonarthrosis) and acute attacks of osteoarthritis.
• Cartilage damage (chondral lesions).
• Meniscus root tear (can be degenerative, other indication for therapy).
• Pes anserinus tendinopathy (pain on the inside of the shinbone).
• Plica syndrome, loose joint bodies.
• Bone marrow edema (subchondral).

Conservative therapy: The first choice

Most degenerative meniscal lesions respond to structured, conservative treatment. The aim is to reduce pain, calm irritation and increase the knee's resilience in everyday life.

• Education and activity control: Adjust the load, avoid deep squatting under load, gradually increase.
• Physiotherapy: strengthening quadriceps, hip abductors and gluteal muscles; neuromuscular training; Flexibility and coordination exercises.
• Short-term pain therapy: Topical NSAIDs, if necessary orally in low doses and for a limited duration; Cooling during stimulus phases.
• Weight management: Even small reductions significantly reduce the load on the knee joint.
• Aids as needed: temporary walking stick on the opposite side; soft knee support for proprioception; Consider a relief orthosis individually in the case of pronounced axial deviation and accompanying osteoarthritis.
• Everyday ergonomics: knee pads when kneeling, break management, suitable shoes.

A structured conservative period of at least 6-12 weeks is usually advisable before invasive measures are considered - unless there is an acute blockage, severe instability or other urgent reasons.

Injections and regenerative procedures: opportunities and limitations

Intra-articular injections can relieve discomfort but do not cure the degenerative meniscus. The selection is made individually, based on a benefit-risk assessment and current evidence.

• Cortisone (intra-articular): can reduce inflammatory pain in the short term, use cautiously; avoid repeated doses.
• Hyaluronic acid: Evidence heterogeneous; Can be helpful for arthritis-related irritation, effect varies from person to person.
• PRP (platelet-rich plasma): Studies indicate possible pain reduction in mild osteoarthritis and chronic irritations; not curative, clear indication required.

We discuss transparently which effects are realistic, which side effects can occur and when a procedure makes sense - always embedded in an active therapy program.

When does an operation make sense?

The arthroscopic partial removal of degenerative parts of the meniscus (partial meniscectomy) is not the standard therapy today. High-quality studies show that many sufferers perform similarly well with good conservative treatment as after arthroscopy.

• Possible indications for surgery: symptoms resistant to therapy despite structured conservative treatment (typically ≥ 6–12 weeks) and/or persistent mechanical symptoms (feeling of pinching, real blockages).
• Special types of tears: Meniscus root tears or unstable basket handle tears can - depending on the circumstances - benefit from repair.
• In advanced osteoarthritis, surgical results are often limited; the decision is made individually.

The aim of an arthroscopy is to proceed as gently as possible to the tissue and to preserve intact parts of the meniscus. Risks include infection, thrombosis, anesthesia complications and possible acceleration of osteoarthritis development. A careful risk-benefit assessment is therefore essential.

Rehabilitation and course

• Conservative: in the first 2-4 weeks focus on calming stimuli and technique training; from weeks 4-8 progressive strengthening and increase in load; then sport-specific return.
• After injection: 24-48 hours of protection, then activation as planned.
• After arthroscopy: usually rapid mobilization, targeted physiotherapy; Office work is often possible after a few days, physical work later - depending on the procedure and its course.

Healing times vary greatly. What is crucial is the gradual increase without an increase in stimulus. Measurable goals (e.g. stairs without pain, 30-minute walk with little discomfort) help with control.

forecast

Many patients achieve significant relief of symptoms and better everyday function with conservative therapy. If there is severe accompanying osteoarthritis or axial deviation, the course is often more variable. Early adjustments to everyday life, targeted training and a realistic build-up of stress are crucial to avoid relapses.

Prevention and everyday tips

• Regular strength and coordination sessions (2–3 times/week) for leg and core muscles.
• Avoid deep squats under additional load, train your technique, and lift loads close to your body.
• maintain weight within a healthy range; Endurance sports that are gentle on the joints (cycling, swimming).
• Knee pads and pads for professional kneeling, break management.
• React early: recognize phases of irritation, adjust the load, cool and provide short-term relief.

When should you see a doctor quickly?

• Suddenly blocked knee (no longer possible to stretch/flex).
• Pronounced swelling after minor trauma or without cause.
• Fever, redness, severe pain at rest (suspicion of inflammatory processes).
• New instability with buckling, especially after twisting trauma.

Your orthopedic contact point in Hamburg-Winterhude

We advise you individually in Hamburg-Winterhude on complaints caused by a degenerative meniscus lesion - with a focus on conservative, everyday solutions and clear indications for further measures. Location: Dorotheenstraße 48, 22301 Hamburg.

Bring with you – if available – previous findings, imaging and a brief overview of previous therapies. Together we will develop a structured plan that fits your goals.