What it means
Joint cartilage is the smooth, rubbery layer that covers the ends of bones so they glide. In chondromalacia it softens, roughens or wears thin. Behind the kneecap (patella) it is called chondromalacia patellae. MRI shows swelling, cracks or thin patches in the cartilage. Radiologists often grade it from 1 to 4. Grade 1 is softening or swelling. Grades 2 and 3 are wear less than or more than halfway through, and grade 4 reaches the bone.
When it matters
Mild chondromalacia is common, even in young active people, and often causes little trouble. It is often found in people with pain at the front of the knee, which tends to worsen with stairs, squatting or long sitting. Higher grades mean deeper wear and can be an early step toward osteoarthritis. Doctors match the grade to your symptoms. Your doctor may suggest exercises to strengthen the thigh and hip muscles.
Questions to ask your doctor
- What grade is the cartilage change, and where exactly is it?
- Could this explain the pain at the front of my knee?
- Is it a sign of early osteoarthritis?
