Knee Locking or Catching? Understanding a Meniscus Tear

Knee discomfort that includes locking, catching or a sense that the knee "gives way" can point to a meniscus tear. The meniscus is a C-shaped cushion in your knee that helps absorb shock and stabilize the joint. When it tears, daily activities—from walking up stairs to squatting—can become painful and restricted. This guide covers what you need to know about meniscus tears: their causes, symptoms, diagnosis, treatment options and recovery.

Anatomy and Function of the Meniscus

• Each knee has two menisci (medial and lateral) between the thigh bone (femur) and shin bone (tibia).
• They distribute weight evenly, protect cartilage and provide stability.
• Tears can occur anywhere in the meniscus but heal best in the outer "red zone" where blood flow is richer.

Common Causes of a Meniscus Tear

Meniscus tears occur in two main ways:

• Traumatic injury
  • Twisting the knee while foot is planted (common in sports)
  • Direct blow or collision (e.g., football, skiing)
• Degenerative changes
  • Wear over time in people over 40
  • Cartilage thinning makes the meniscus more prone to tearing during normal activities

Recognizing the Symptoms

A meniscus tear can present with a variety of signs. Common symptoms include:

• Pain
  • Localized along the joint line
  • Worse when twisting, pivoting or squatting
• Swelling
  • May develop gradually over 24–48 hours
• Locking or catching
  • Knee may abruptly "freeze" or feel stuck
• Reduced range of motion
  • Difficulty fully bending or straightening the knee
• Clicking or popping sensations
  • Audible sound when moving the knee
• Instability
  • Feeling the knee might give out

If you're experiencing any of these symptoms and want to understand what might be causing them, you can check your symptoms with Ubie's free AI-powered assessment tool to get personalized insights in just a few minutes.

How a Meniscus Tear Is Diagnosed

Diagnosing a meniscus tear typically involves:

1. Medical History
   • How and when symptoms began
   • History of knee injuries or arthritis
2. Physical Examination
   • Palpating along the joint line for tenderness
   • Special tests:
     • McMurray's test: bending and rotating the knee to reproduce pain or a click
     • Apley's compression test: patient lies face down while the clinician applies pressure to the heel and rotates the tibia
3. Imaging
   • X-ray: rules out fractures and arthritis
   • Magnetic Resonance Imaging (MRI): gold standard for visualizing soft tissue tears
4. Arthroscopy (if needed)
   • Minimally invasive procedure that uses a camera to look inside the knee and confirm the tear

Treatment Options

Treatment depends on the tear's size, location and your activity level. Options range from conservative care to surgery.

Conservative (Non-Surgical) Management

Ideal for small, stable tears in the outer zone, or patients with low activity demands:

• Rest, Ice, Compression, Elevation (RICE)
  • Rest from aggravating activities
  • Ice for 10–20 minutes, several times a day
  • Compression bandage to reduce swelling
  • Elevate the leg above heart level
• Medications
  • Over-the-counter NSAIDs (ibuprofen or naproxen) to relieve pain
• Physical Therapy
  • Strengthening around the quadriceps and hamstrings
  • Range-of-motion exercises to restore flexibility
  • Balance and proprioception training

Injection Therapy

• Corticosteroids: short-term relief of inflammation
• Platelet-Rich Plasma (PRP): may support healing in some tears

Surgical Intervention

Considered when conservative care fails or for large, unstable tears, especially in active individuals:

• Arthroscopic Repair
  • Sutures or anchors used to sew the torn edges together
  • Best for tears in the vascular zone (outer third)
• Partial Meniscectomy
  • Trimming and smoothing of the torn fragment
  • Faster recovery but removes cushioning tissue
• Meniscus Transplant
  • Rare, for young patients with extensive meniscus loss
  • Donor tissue is implanted to restore function

Recovery and Rehabilitation

Recovery depends on the treatment chosen:

• Non-surgical
  • Return to light activities in 4–6 weeks
  • Full recovery in 8–12 weeks
• After repair surgery
  • Partial weight-bearing for 4–6 weeks
  • Brace to protect repair, gradually weaned off
  • Full activities in 4–6 months
• After meniscectomy
  • Weight-bearing as tolerated immediately
  • Return to most activities in 6–8 weeks

Key rehabilitation goals at each stage:

• Reduce swelling and pain
• Restore knee range of motion
• Rebuild strength and stability
• Gradually reintroduce sport-specific drills

Preventing Future Tears

While some risk factors (age, genetics) can't be changed, you can lower your chance of meniscus tear by:

• Maintaining strong leg muscles
  • Focus on quads, hamstrings and hip stabilizers
• Practicing proper technique
  • When jumping, landing and pivoting in sports
• Using supportive footwear
  • Choose shoes designed for your activity surface
• Incorporating balance exercises
  • Single-leg stands, wobble boards to improve joint stability

When to Seek Medical Attention

A meniscus tear can often be managed conservatively, but seek prompt care if you experience:

• Inability to bear weight on the knee
• Severe swelling that does not improve with RICE
• Fever, redness or warmth around the knee (signs of infection)
• Persistent locking with no ability to straighten the knee

If you experience chest pain, shortness of breath or any life-threatening symptom, call emergency services immediately.

Final Thoughts

A meniscus tear can range from a minor nuisance to a disabling injury. Early diagnosis and the right treatment plan—guided by a healthcare professional—give you the best chance of returning to pain-free movement. Before your doctor's appointment, you can take Ubie's free AI symptom checker to help identify potential causes and prepare informed questions for your healthcare provider.