Cartilage defects are common terms in MRI reports, but many patients do not understand what the phrase actually means for daily life, pain, and future joint health. Cartilage is the smooth protective surface that covers the ends of bones inside a joint. Its job is to help movement stay low-friction and balanced under load. When cartilage is damaged, the joint may become painful, swollen, less reliable, or more vulnerable to long-term wear. In my practice, I often see Bangladeshi patients who become anxious after reading the word "defect" in a report, even before anyone has explained whether the problem is small, stable, serious, or treatable. [2]
What a cartilage defect means
A cartilage defect means an area of the normal smooth joint surface has been injured, worn down, or lost. The problem may be small or large, shallow or deep, stable or unstable. Sometimes only the cartilage is affected. In other cases the bone underneath is also involved, which may be described as an osteochondral lesion. [1]
The knee is one of the most common joints where people hear this term, but cartilage problems may also occur in the hip, ankle, shoulder, and other joints. One important point I explain early is that cartilage does not heal the same way skin or muscle does. That is why symptoms may linger and why treatment has to be chosen carefully. [2]
Common causes of cartilage damage
There is no single cause for every cartilage defect. A sudden sports injury can damage the joint surface. Repeated overload can gradually wear it down. Malalignment, instability, previous dislocation, meniscus damage, obesity, and early degenerative change can all contribute. [2]
In younger active patients, cartilage injury often follows twisting trauma, high-impact sports, or instability episodes. In older adults, cartilage damage may develop as part of early osteoarthritis. In real practice, the exact background matters because treatment only makes sense when the cause is understood. A patient with instability-related damage is not managed in exactly the same way as someone with early wear-and-tear change. [2]
Symptoms patients commonly describe
Symptoms depend on the size and location of the defect and on whether other joint problems are present. Some patients mainly complain of pain during walking, stair climbing, squatting, or sports. Others notice swelling after activity, catching, or a feeling that the joint cannot be trusted fully.
If the lesion is in the knee, kneeling, stairs, and rising from the floor may become difficult. If the cartilage problem is unstable or associated with a loose fragment, the joint may catch or lock. Mild defects can be deceptive because symptoms may come and go at first. Patients often rest briefly, feel a little better, and then return to the same aggravating habits without understanding that the joint is still irritated.
How I assess a cartilage defect
When I evaluate suspected cartilage damage, I begin with the story. Was there a clear injury? Is the pain well localized or more diffuse? Does the joint swell after activity? Is there catching, clicking, or giving way? Then I examine alignment, tenderness, range of motion, swelling, stability, muscle strength, and joint mechanics.
