Meniscus Root Tear

The knee joint consists of three bones: the femur, tibia, and patella (kneecap). Between the femur and tibia are the medial and lateral menisci, which distribute body weight and reduce friction during movement. Each meniscus attaches to the tibia at two key points—the anterior root and posterior root—which anchor it securely to the bone.

These root attachments are crucial because they allow the meniscus to convert compressive forces (like walking or running) into circumferential tension that protects the cartilage. When a root tear occurs, the meniscus loses this ability, leading to increased pressure on the joint surface and cartilage degeneration.

Over time, this can cause pain, swelling, and a feeling of instability or “giving way.” Left untreated, the condition can progress quickly to arthritis—even in otherwise healthy knees.

Meniscus root tears are more common than once believed. They often occur in two distinct groups:

1. Middle-aged or older adults with degenerative cartilage changes. A simple movement like squatting, kneeling, or standing up from a seated position can cause the tear.
2. Younger athletes who sustain a twisting or high-impact injury during sports such as skiing, soccer, or basketball.

The posterior root of the medial meniscus is the most commonly injured site. Research shows that these tears may account for up to 10–20% of all meniscus tears, though they are frequently missed on initial imaging if not specifically looked for.

Women, patients with higher body weight, and those with varus (bow-legged) alignment are at higher risk for developing degenerative root tears.

A detailed history and physical examination are the first steps in diagnosis. Dr. José Vega, Cleveland’s trusted knee specialist, will ask about the mechanism of injury, onset of symptoms, and prior knee problems.

Common signs include:

• Deep, aching pain in the back or inside of the knee
• Swelling and stiffness
• Pain when squatting, twisting, or going up and down stairs
• Occasional “popping” or feeling of the knee giving out

During the exam, Dr. Vega may perform specific maneuvers to assess joint stability and pain location.

Imaging tests are often essential:

• MRI is the gold standard for diagnosing meniscus root tears. It can show the tear’s location and whether the meniscus has shifted or “extruded” from the joint.
• X-rays help assess alignment and detect early arthritic changes that may influence treatment decisions.

Early detection is important because timely repair can prevent further cartilage damage and joint degeneration.

Treatment depends on the patient’s age, activity level, alignment, and degree of cartilage damage.

Nonsurgical treatment

Nonsurgical treatment may be considered for patients with advanced arthritis or those who are not surgical candidates. Options include:

• Activity modification and rest to reduce stress on the joint
• Anti-inflammatory medications for pain control
• Physical therapy to strengthen the surrounding muscles and improve stability
• Corticosteroid or biologic injections to reduce inflammation and pain

Surgical treatment

However, in many patients—especially younger, active individuals or those with minimal arthritis—surgical repair offers the best chance of preserving the knee joint.

Arthroscopic meniscus root repair involves using small incisions and sutures to reattach the torn meniscus root back to the bone. This restores the meniscus’s ability to distribute load and protect the cartilage. Recovery typically involves limited weight-bearing and gradual rehabilitation over several months.

Without repair, a meniscus root tear often leads to rapid joint degeneration and arthritis progression within a few years.

While not all meniscus root tears can be prevented, certain steps can reduce risk and protect knee health:

• Maintain a healthy weight to decrease stress on the meniscus.
• Avoid deep squatting or twisting movements, especially if you have early signs of arthritis.
• Strengthen the quadriceps, hamstrings, and hip muscles to improve knee stability.
• Address knee pain early—prompt evaluation can prevent minor injuries from worsening.
• Use proper technique during sports and exercise to minimize joint stress.