Why does knee lock suddenly?

Dr Yugal Karkhur
Created on: 16/02/2026

Answer

Sudden knee locking occurs when something inside the joint blocks normal movement, preventing the knee from fully bending or straightening. It may be temporary or persistent and is often linked to structural damage within the joint.

1. Meniscus Tear
A torn meniscus is the most common cause. A loose cartilage fragment can get stuck between joint surfaces, causing mechanical locking.

2. Loose Bodies in the Joint
Small bone or cartilage fragments floating inside the joint can obstruct movement and cause sudden locking.

3. Ligament Injury
Severe ligament tears may lead to joint instability and abnormal movement, sometimes resulting in locking sensations.

4. Cartilage Damage or Arthritis
Degenerated or rough cartilage surfaces can interfere with smooth joint motion, producing catching or locking episodes.
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