Knee Articular Cartilage Damage / Osteoarthritis

For over 30 years, we have regenerated damaged articular cartilage to help people preserve their natural joints and avoid artificial replacement. An articular cartilage paste graft uses a patient’s own bone and cartilage to stimulate regrowth of damaged cartilage surfaces.

What is Articular Cartilage?

Articular cartilage is the soft, white cartilage that covers the ends of the bones and helps the joints to move smoothly. It also helps to absorb the forces throughout the knee.

Articular Cartilage Injury/Damage

This articular cartilage surface can be damaged by trauma such as a sports injury. Normal use, including running, won’t wear out the cartilage unless it’s been previously injured or if the meniscus cartilage has been removed. Bone malalignment or being overweight can also contribute to damage. The diseases of osteoarthritis and inflammatory arthritis can directly damage the cartilage surfaces as well.

Once damaged, articular cartilage will not heal on its own. And over time, the cartilage breaks down and the underlying bone reacts. As the bone stiffens and develops bone spurs (osteophytes), the joints become inflamed and swollen, which damages the cartilage even more, leading to pain, swelling or loss of motion. This is traumatic osteoarthritis.

Knee osteoarthritis is the most common form of arthritis, affecting millions of people around the world. Untreated, it is usually a progressive degenerative disease in which the joint cartilage gradually wears away.

Articular cartilage damage is graded according to its severity.

  • Grade 0: Normal healthy cartilage.
  • Grade 1: The cartilage has a soft spot or blisters.
  • Grade 2: Minor tears visible in the cartilage.
  • Grade 3: Lesions have deep crevices (more than 50% of cartilage layer).
  • Grade 4: Exposed underlying bone.

Our Unique Approach to Articular Cartilage Repair

Early identification and treatment of articular cartilage damage can have a significant effect on outcomes for patients. We address cartilage damage as part of our biologic joint replacement procedure. By repairing or replacing the damaged cartilage before it completely wears out, the arthritic damage can be reversed and the joints preserved.

If this step is not taken, eventually the cartilage wear will progress so much that the bones will touch on each side of the joint, called bone on bone wear.  At this stage, artificial joint replacement becomes necessary. 

Articular Cartilage Paste Graft

At The Stone Clinic, we have a unique procedure for repairing articular cartilage: the Articular Cartilage Paste Graft, designed by Dr. Stone in 1991.

Articular cartilage paste grafting (often abbreviated as art cart or paste grafting) uses your own bone, cartilage, and marrow cells to regenerate your damaged cartilage. It is a minimally invasive, single arthroscopic procedure that stimulates regrowth of damaged articular cartilage surfaces.

The arthritic area of the knee, or the area where there is missing cartilage, is morselized by the surgeon to create a fresh blood supply and to bring marrow cells to the surface. The graft is harvested from the intercondylar notch (a non-weight bearing part of the knee), crushed into a paste, and packed into the fractured chondral defect. The result is a repair technique that can provide durable cartilage repair tissue with long-term improvement in function and diminishment of pain.

Dr. Stone says ...

Dr. stone

"Articular cartilage paste grafting has provided my patients with tremendous relief and permitted a return to sports for many arthritic joints that were thought to require joint replacement. Our published peer reviewed long-term outcome studies have matched or exceeded any other published work. Paste grafting has been a great tool for salvaging failed microfractures and other cartilage procedures."

Cartilage Repair Overview

Outcome Studies Show Great Long-Term Results

In order to constantly improve our techniques we follow up on many of our paste graft patients.

How is Osteoarthritis Assessed?

To properly diagnose your situation, we will likely go through the following process:

  • Exam:  A careful history and physical exam is the first step to analyze your condition. We will look for symptoms, such as:
    • Joint Pain
    • Tenderness to touch
    • Loss of flexibility
    • Grating or grinding sensation
    • Bony spurs
  • X-rays: to check the joint space, bony spurs, alignment of the legs, signs of inflammatory arthritis.
  • MRI: to see the condition of articular cartilage and meniscus, which is the shock absorber of the knee.
  • Physical therapy evaluation: More detailed look at gait, range of motion, compensatory movements and weaknesses, soft tissue mobility, and flexibility

Additional treatments:

Currently, injections of biologic agents are incorporated into the treatment of our patients recovering from knee injuries. Since an arthritic knee is different from an ACL-injured knee, the future will bring customized injections that produce more targeted responses. Meanwhile—as we await the results of further studies—we combine PRP with HA to create a broadly stimulating "cocktail." You may find a brief summary of our injection choices here—with the understanding that we are actively engaged in research to improve and target these injections for the future. 

Partial or Total Knee Replacement at The Robotic Joint Center

When a BioKnee replacement is not possible because the damage to the cartilage is too great, then we recommend an artificial knee replacement, a partial replacement if possible or a total replacement. We perform robot-assisted surgery for superior results.

Partial Knee Replacement

When only part of a knee joint is worn out we choose to replace only that part, preserving the rest of the knee.  Now with the use of a robot (MAKO) we are able to accurately resurface the injured area as an outpatient procedure.  Our “only do what is necessary”, philosophy has the advantage of immediate pain relief and faster rehab.

Total Knee Replacement

In artificial joint replacement surgery (arthroplasty), the damaged joint surfaces are replaced with plastic and metal devices called prostheses. These provide tremendous relief for bone-on-bone patients. We no longer restrict the activities of our patients after joint replacement and, in fact, we encourage them to become more active than they have been in years, returning to running and other high-level or impact sports. 

Download a Guide to our Knee-Saving Procedures
Explore all your options. Learn about procedures that can help you return to sports & delay or avoid an artificial knee replacement.

Download a Guide to our Knee-Saving Procedures

Saving My Knee Guide

Saving My Knee Guide
Learn about procedures that can help you return to sports & delay or avoid an artificial knee replacement.