Overview

Understanding the Lateral Meniscus and Tear Types

The meniscus is a rubbery, wedge-shaped pad made of cartilage that sits between the femur and tibia. It acts as a shock absorber and helps keep the knee joint stable during movement. The lateral meniscus is located on the outer side of the knee and is more mobile than the medial meniscus, making it more prone to certain types of injuries.

There are six major types of lateral meniscus tears, each with different patterns and treatment needs:

• Radial Tear: A tear that starts in the inner edge of the meniscus and moves outward, often affecting knee stability. 
• Longitudinal (Vertical) Tear: A straight tear along the length of the meniscus that may progress into a bucket-handle tear. 
• Horizontal Tear: A tear that separates the meniscus into upper and lower layers, common in older adults. 
• Parrot Beak Tear: A curved tear that creates a flap of loose cartilage, causing catching or locking. 
• Bucket-Handle Tear: A large tear where a section flips into the joint, causing the knee to lock. 
• Flap Tear: A small, loose piece of cartilage that catches during movement. 

Radial, bucket-handle, and flap tears are the most common. These injuries can range from small, stable tears to large ones that cause significant lateral meniscus pain and difficulty walking.

 

 

What causes Lateral Meniscus Tears?

Most lateral meniscus injuries happen when the knee twists while the foot is firmly on the ground. This sudden rotation can strain the cartilage and lead to a tear, especially during quick changes in direction. With age, the meniscus becomes less resilient, so even simple movements such as squatting or stepping incorrectly may cause injury without any major impact.

How the Injury Occurs:

• Sudden pivoting or twisting during sports 
• Landing awkwardly from a jump 
• Deep squatting or heavy lifting 
• Direct impact on the outer knee 

Common Everyday Causes:

• Turning too quickly on the stairs 
• Kneeling or squatting for long periods 
• Getting up awkwardly from the floor 
• Gradual cartilage weakening with age 

Sports Most Likely to Cause Lateral Meniscus Tears:

Lateral meniscus tears are common in sports that demand quick turns, sudden stops, and repeated jumping. These movements place steady strain on the outer side of the knee and increase the chance of injury: 

• Basketball: Quick pivots and jumps put stress on the knee 
• Football: Tackles and sharp cuts often twist the joint 
• Rugby: Collisions and forceful turning movements raise the risk of tearing 
• Soccer: Sharp turns and rapid stops strain the outer knee
  
• Tennis: Side-to-side motions place pressure on the lateral meniscus

Symptoms

A tear in the lateral meniscus often produces several recognizable signs. These may appear immediately after the injury or develop gradually over the next few days. A lateral meniscus injury may cause one or more of the following symptoms:

• Swelling of the knee  
• Pain on the outer side of the knee 
• Locking or catching, where the knee gets stuck during movement 
• Limited extension, making it difficult to fully straighten the knee 
• A popping sound at the time of injury 

Pain may worsen when twisting, squatting, or bearing weight.

Non-operative treatment

Small tears or degenerative lateral meniscus injuries often improve with conservative care. Your doctor may recommend:

• Icing the knee to reduce swelling 
• Resting the leg and avoiding twisting or squatting 
• NSAIDs for pain and inflammation 
• A knee brace to support the joint 
• Physical therapy to strengthen muscles and improve stability 

These treatments may help reduce pain and improve mobility over several weeks.

Try these exercises to help address your condition:

Below is a PDF of the Exercise Program

Lateral Meniscus Tear

Surgical Treatment

If conservative care does not relieve symptoms or if the tear is large and causing strong lateral meniscus pain, surgery may be advised. The choice of procedure depends on the tear’s size, pattern, location, and your overall knee health.

• Common Surgical Options:

1. Meniscus Repair Surgery
   The surgeon stitches the torn edges of the meniscus so they can heal together. This option is used when the tear lies in a region with a reliable blood supply. Recovery takes longer because the tissue must heal fully before the knee can tolerate regular strain.
2. Meniscectomy (Partial Removal)
   When a repair is not possible, the damaged portion of the meniscus is trimmed and removed. Recovery is often quicker, though removing tissue may slightly raise the chance of developing arthritis later in life.

• How Surgery Is Performed

Most procedures are arthroscopic and use small incisions. A thin camera is placed inside the knee to guide the surgeon, while fine instruments repair or remove the injured tissue. In some repairs, an additional small incision may be needed to secure the sutures.