Chondral Defects of Knee

Cartilage defects are areas where the smooth surface of the knee joint becomes damaged or worn down, especially in a specific spot. This can cause pain, swelling, stiffness, and sometimes locking or catching in the knee. If left untreated, these defects can worsen and increase the risk of developing arthritis.

Cartilage defects can be caused by injury, repetitive stress from sports or physical activity, or age-related wear. Damage often follows trauma like twisting the knee, direct impact, or from changes in joint stability after other injuries, like ligament tears. Sometimes genetics or conditions like osteochondritis dissecans also play a role.

Cartilage (chondral) defects of the knee are diagnosed with a comprehensive approach. Diagnosis starts with a physical exam and a review of your symptoms. X-rays can check for bone issues, but cartilage is best seen with MRI. In some cases, Sachin Allahabadi MD may recommend arthroscopy — a minimally invasive procedure — to look directly at the cartilage inside the joint. The size, depth, location, and characteristics of the defect are crucial for treatment planning.

What are the treatment options for cartilage (chondral) defects of the knee?

Treatment depends on the size, depth, and location of the defect, as well as patient age and activity level. Options range from non-surgical management (activity modification, physical therapy, injections) to surgical procedures aimed at repairing, stimulating, or replacing the damaged cartilage.

What is fixation of an osteochondral lesion?

Fixation is a surgical technique used when a piece of cartilage and underlying bone has partially or fully detached. The fragment is repositioned and secured with small pins, screws, or bioabsorbable implants to restore joint surface and promote healing.

What are cartilage restoration procedures?

These are surgical techniques designed to regenerate or replace damaged cartilage. They are typically used for focal cartilage defects in younger, active patients. Common approaches include microfracture, autologous chondrocyte implantation (ACI), and osteochondral allograft transplantation.

What is a microfracture procedure?

Microfracture is a minimally invasive technique where small holes are made in the bone beneath the cartilage defect. This stimulates bleeding and the formation of a clot that can develop into fibrocartilage, helping to fill the damaged area. It’s best suited for small defects.

What is a matrix-induced autologous chondrocyte implantation (MACI) procedure?

MACI is a two-stage procedure. In the first stage, a small sample of the patient’s cartilage is harvested. The cells are grown in a lab and then re-implanted onto a collagen matrix, which is secured into the defect in a second surgery. This technique aims to regenerate hyaline-like cartilage for better long-term function.

What is an osteochondral allograft procedure?

This procedure involves transplanting a cartilage-and-bone graft from a donor into the cartilage defect. It’s typically used for larger lesions or when bone involvement is significant. Allografts offer the benefit of replacing both cartilage and underlying bone in a single step.

What is recovery from surgery for fixation of an osteochondral lesion?

Recovery from fixation typically takes 3 to 6 months. Patients may be non-weight-bearing or limited in weight-bearing for several weeks to allow healing. A brace may be used to protect the joint. Physical therapy begins early to maintain motion and gradually progresses to strengthening and return to activity.

What is recovery from a microfracture procedure?

Recovery after microfracture often takes 4 to 6 months. Patients are usually non-weight-bearing for 6 to 8 weeks to protect the healing area. Early motion is encouraged, and physical therapy is key to regaining range of motion and strength. Return to high-impact activities is delayed to allow cartilage to mature.

What is recovery from a matrix-induced autologous chondrocyte implantation (MACI) procedure?

Recovery from MACI is longer, typically 6 to 12 months. Patients are non-weight-bearing or limited for 6 to 8 weeks. A structured rehab program follows, focusing on joint motion, gradual loading, and strengthening. Return to sports often begins around 9 to 12 months, depending on healing and function.

What is recovery from an osteochondral allograft transplant procedure?

Recovery from osteochondral allograft transplantation usually takes 6 to 12 months. Weight-bearing is limited for the first 6 to 8 weeks. Rehab includes motion exercises, gradual strengthening, and activity progression. Return to full sports or high-impact activity is generally allowed after 9 to 12 months.