Creaking noises in the knee, often referred to as “crepitus,” can be caused by several factors: 1. Chondromalacia or Cartilage Wear and Tear: As people age, the cartilage in the knee can wear down, leading to rough surfaces that rub against each other. 3. Meniscus Tears: The meniscus, a piece of cartilage in the knee, can tear and cause a creaking or clicking sound. 4. Ligament or Tendon Movement: Ligaments and tendons may snap over bony protrusions in the knee, causing a popping noise. 5. Arthr