Meniscus Tear (Meniscal Injury): Complete Guide | Clinique Sport Santé

A meniscus tear is the second most common knee injury in sports medicine, behind patellofemoral pain syndrome. In Quebec and across Canada, "torn meniscus," "meniscus tear," and "knee meniscus injury" rank among the most searched sports medicine terms — and for good reason: this injury affects elite athletes, recreational players, and manual workers alike. Understanding your meniscal injury is the first step toward effective treatment and a lasting return to sport.

Anatomy of the Meniscus: Medial and Lateral

The knee contains two menisci — crescent-shaped fibrocartilaginous structures positioned between the femur and tibia. Their role is fundamental:

• Shock absorption: the menisci absorb 50–70% of axial compressive forces at the knee
• Load distribution: they increase the contact area between the femur and tibia, reducing pressure on the articular cartilage
• Stabilization: they contribute to passive knee stability, particularly the medial meniscus in conjunction with the anterior cruciate ligament
• Proprioception: they contain mechanoreceptors that inform the brain about knee position and movement

The medial meniscus (inner) is a wider "C" shape, more rigid and less mobile than its lateral counterpart. It is firmly attached to the medial collateral ligament and the joint capsule, making it more vulnerable to tears during valgus-external rotation trauma. It is the most frequently injured (55–70% of cases).

The lateral meniscus (outer) is more circular and more mobile. Its increased mobility offers some protection against point trauma, but makes it vulnerable during varus-internal rotation movements and in combined knee injuries (the "unhappy triad": ACL + MCL + medial meniscus).

Meniscal vascularity is critical for understanding healing potential. Three zones are identified:

• Red-red zone (periphery): well-vascularized, good healing potential
• Red-white zone (middle): partial vascularization, variable healing potential
• White-white zone (avascular center): no vessels, poor natural healing potential

This zonal distribution directly determines whether a tear can heal without surgery or requires surgical repair.

Mechanisms of Injury: Rotation, Hyperflexion, Degeneration

Meniscal injuries occur through two main mechanisms:

Acute trauma — The classic mechanism is a forced knee rotation in semi-flexion with the foot planted. The foot is fixed, the knee bent at 20–90°, and the body or an opponent applies a rotational force. This mechanism is common in:

• Pivot sports (soccer, basketball, handball, hockey)
• Alpine skiing (fall with rotation)
• Martial arts and combat sports
• Hiking on uneven terrain

Forced hyperflexion (fully bent knee) is a second traumatic mechanism — common in combat sports, gymnastics, and falls onto the knees. It violently compresses the posterior horn of the meniscus between the femur and tibia.

Progressive degeneration — After age 35–40, the meniscal fibrocartilage gradually weakens. Tears can occur during ordinary activities (rising from a squat, climbing stairs) without significant trauma. These degenerative lesions are distinct from traumatic injuries and are managed differently.

Classification of Meniscal Tears

Meniscal tears are classified by their morphology, location, and orientation:

Longitudinal tear — Parallel to the meniscus periphery, in the vascularized zone. Good potential for surgical repair. Can progress to a bucket-handle tear if it extends.

Bucket-handle tear — A long variant of the longitudinal tear where the central fragment displaces into the intercondylar notch, like a bucket handle. It can block knee motion (inability to fully extend — surgical red flag). Represents 10–26% of meniscal tears.

Radial tear — Perpendicular to the free margin of the meniscus, directly compromising its hoop stress function. Poor healing potential, but can be managed with repair or partial meniscectomy depending on extent.

Horizontal tear — Cleavage in the horizontal plane of the meniscus, often associated with degeneration. Common in those over 40. Can form a meniscal cyst at the periphery.

Flap tear (parrot-beak tear) — A mobile meniscal fragment that can become trapped in the joint, causing intermittent locking or catching episodes.

Complex tear — Combination of multiple types, often associated with advanced degenerative lesions.

Symptoms and Diagnosis

The clinical presentation of a meniscal injury depends on the type and location of the tear:

Characteristic symptoms:

• Localized pain at the medial or lateral joint line — precise pain, worsened by joint-line palpation
• Knee swelling (hemarthrosis in acute injuries, progressive effusion in chronic cases)
• Locking or extension deficit in bucket-handle tears
• Catching or clicking sensation during knee movements
• Pain on stairs, squatting, or during rotational movements
• Recurrent post-activity swelling in chronic tears

Specific clinical tests:

The sports medicine physician uses several validated clinical maneuvers:

• McMurray test — Supine, knee flexed to 90°, the physician applies internal rotation (for the lateral meniscus) then external rotation (for the medial meniscus) while extending the knee. Positive if clicking or joint-line pain. Sensitivity 53–74%, specificity 59–87%.
• Apley compression test — Prone, knee at 90°, axial compression with rotation. Differentiates meniscal from ligamentous injuries (Apley distraction test).
• Thessaly test — Patient stands on one leg, knee at 20° flexion, body rotates. High sensitivity (89%) for symptomatic meniscal tears.
• Joint-line palpation — Precise tenderness at the medial or lateral joint line is one of the most reliable clinical signs.

Imaging:

Knee MRI is the gold standard for confirming and characterizing a meniscal tear. Sensitivity reaches 87–93% for meniscal tears. It also assesses associated ligamentous injuries (ACL, MCL) and articular cartilage — critical information for treatment planning.

Musculoskeletal ultrasound complements MRI by evaluating periarticular structures and can detect a peripheral meniscal cyst. It is less reliable for central intrameniscal lesions.

Plain radiographs are indicated to rule out fracture, assess joint space narrowing (sign of arthritis), or detect intra-articular loose bodies.

Conservative Treatment

Contrary to popular belief, not all meniscal tears require surgery. For stable, small tears in a vascularized zone, or in well-selected active patients, conservative treatment achieves excellent results.

Acute phase (weeks 1–3):

• POLICE protocol (Protection, Optimal Loading, Ice, Compression, Elevation) — replaces RICE in current recommendations
• Partial or full weight-bearing restriction if significant pain on loading
• NSAIDs short-term to control effusion
• Early physiotherapy to maintain range of motion and prevent muscle atrophy

Rehabilitation phase (weeks 3–12):

• Quadriceps and hamstring strengthening — periarticular muscles partially compensate for the meniscal function as shock absorbers
• Hip stabilizer strengthening — corrects biomechanical deficits that may have contributed to the injury
• Proprioception and balance training — restores neuromuscular knee control, frequently disrupted after a meniscal injury
• Closed-chain exercises — leg press, mini-squats, step-ups

Injections to control inflammation:

When significant joint effusion or persistent pain impairs rehabilitation, injections may be considered:

• An intra-articular cortisone injection rapidly reduces inflammation and effusion, enabling faster progression in physiotherapy. It is particularly indicated for degenerative tears with reactive synovitis.
• A PRP (platelet-rich plasma) injection may support healing of meniscal tears in the vascularized zone and reduce chronic inflammation. Recent data show potential benefit, particularly for red-white zone tears.
• In the presence of early osteoarthritis in the associated compartment, viscosupplementation can improve joint lubrication and reduce pain over the medium term.

All injections are performed under real-time ultrasound guidance for optimal precision.

Surgical Treatments: Meniscectomy and Meniscal Repair

Surgery is indicated when conservative treatment fails, or upfront in situations that warrant it (joint locking, displaced bucket-handle tear, complex lesions).

Knee arthroscopy — All meniscal procedures are now performed by arthroscopy (minimally invasive surgery). Two to three 5-mm incisions allow insertion of the camera and surgical instruments. Hospital stay is one day (outpatient surgery in most cases).

Partial meniscectomy (resection)

Resection of the torn meniscal fragment, preserving the maximum of healthy tissue. This is the most common procedure (60–70% of meniscal surgeries).

• Indications: avascular zone tears (white-white), complex degenerative tears, irreparable tears
• Advantages: rapid recovery (return to walking in 1–2 days, return to sport in 4–8 weeks)
• Limitations: every millimeter of meniscus resected increases stress on the articular cartilage — resection should be as limited as possible

Meniscal repair (suturing)

Suturing the torn fragment to restore meniscal integrity. This is the preferred procedure when conditions are favorable.

• Indications: fresh longitudinal tears in the red-red or red-white zone, young patient (< 40 years), with or without ACL reconstruction
• Advantages: preserves the meniscal tissue, protects articular cartilage long-term
• Constraints: longer post-operative non-weight-bearing (4–6 weeks), return to sport in 4 to 6 months, healing rate varies by zone (70–90% in the red-red zone)

The choice between meniscectomy and repair depends on tear morphology, vascular location, patient age, and desired activity level. The surgeon evaluates these parameters at the pre-operative consultation — and sometimes adapts the strategy intraoperatively based on arthroscopic findings.

Post-Operative Rehabilitation

The rehabilitation protocol differs depending on the procedure performed.

After partial meniscectomy:

• Day 0–7: progressive weight-bearing allowed, NSAIDs and ice, early mobilization to control effusion
• Weeks 1–3: full range-of-motion exercises, isometric quadriceps strengthening, static proprioception
• Weeks 3–6: progressive dynamic strengthening (leg press, mini-squats), stationary cycling, swimming
• Weeks 6–8: return to running on flat surfaces, light plyometric exercises
• Return to sport: 6–8 weeks for non-contact sports, 8–12 weeks for pivot/contact sports

After meniscal repair:

• Weeks 0–4: full or partial non-weight-bearing (brace locked in extension), gentle passive mobilization in physiotherapy
• Weeks 4–8: progressive weight-bearing, flexion limited to 90° initially, gentle quadriceps strengthening
• Weeks 8–16: progressive flexion, progressive strengthening, advanced proprioception
• Weeks 16–24: return to running, sport-specific training, progressive return to team sports
• Full return to sport: 4 to 6 months, based on functional criteria (strength, proprioception, absence of pain)

Regardless of protocol, specialized physiotherapy is essential. Strengthening the periarticular muscles (quadriceps, hamstrings, gluteals) remains the most important prognostic factor for long-term functional outcome.

Prevention and Return to Sport

While not all traumatic meniscal injuries are preventable, several measures significantly reduce risk:

Preventive strengthening:

• Balanced quadriceps and hamstrings — a hamstring/quadriceps ratio > 0.6 protects the knee during pivot movements
• Hip stabilizers (gluteus medius, external rotators) — reduce dynamic knee valgus that increases meniscal stress
• Advanced proprioception — unstable surface training, single-leg exercises, controlled jump landings

Biomechanical correction:

• Landing mechanics: knee bent, aligned over the foot, without valgus collapse
• Running gait analysis for running sports — correction of excessive dynamic valgus
• Foot orthotics if documented hyperpronation

Return to sport after treated meniscal injury:

• Objective functional criteria before return: injured limb strength ≥ 90% of the uninjured side, no pain or effusion
• Gradual load progression over 4–6 weeks after resumption
• Knee brace during pivot sports in the 6 months following meniscal repair

For patients wondering when to seek care for persistent knee pain after an injury, our guide When to See a Sports Medicine Doctor provides a practical decision framework. For injuries combining tendinopathy with perimeniscal pain, see our article on tendinopathy. If the knee also shows signs of patellofemoral pain syndrome (runner's knee), our guide offers useful biomechanical context.

Book an appointment: If you have persistent knee pain, an episode of locking, swelling, or a suggestive injury mechanism, book a consultation with Dr. Labrecque-Sauvé for a complete evaluation including clinical examination and, if indicated, diagnostic imaging. Book a sports medicine consultation.

Frequently Asked Questions (FAQ)

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