Cartilage Transplantation: Methods, Procedure & Recovery
Cartilage transplantation is a surgical procedure to restore damaged joint cartilage. It is used for cartilage defects to relieve pain and improve joint function.
Things worth knowing about "Cartilage transplantation"
Cartilage transplantation is a surgical procedure to restore damaged joint cartilage. It is used for cartilage defects to relieve pain and improve joint function.
What is Cartilage Transplantation?
Cartilage transplantation is a surgical procedure in which damaged or destroyed joint cartilage is replaced or regenerated with new cartilage tissue. Cartilage is a smooth, elastic tissue that covers the bone surfaces in joints and acts as a cushion during movement. Because cartilage has no direct blood supply, its ability to heal on its own is very limited. Cartilage transplantation aims to restore natural joint function and prevent early-onset osteoarthritis (joint degeneration).
Causes of Cartilage Damage
Cartilage defects that may require transplantation can result from various causes:
- Sports injuries: Sudden impact or twisting movements can damage cartilage in the knee, ankle, or shoulder.
- Traumatic injuries: Direct force to a joint frequently leads to localized cartilage defects.
- Osteochondrosis dissecans: A disruption of bone blood supply that causes cartilage and bone fragments to detach.
- Degenerative changes: Chronic wear of cartilage, as seen in osteoarthritis.
- Inflammatory joint diseases: Conditions such as rheumatoid arthritis can destroy cartilage tissue.
Methods of Cartilage Transplantation
Several surgical techniques are available, chosen based on the size and location of the defect as well as the patient's age and activity level:
Autologous Chondrocyte Implantation (ACI)
Autologous Chondrocyte Implantation involves a first procedure in which the patient's own cartilage cells (chondrocytes) are harvested from a low-load-bearing area of the joint. These cells are then cultured and expanded in a laboratory over several weeks before being implanted into the cartilage defect in a second surgery. This technique is particularly suitable for larger cartilage defects.
Osteochondral Transplantation (OATS / Mosaicplasty)
Osteochondral transplantation involves harvesting small cartilage-bone cylinders (plugs) from a low-load-bearing area of the joint and transferring them to the defect site. This technique is also known as mosaicplasty or OATS (Osteochondral Autograft Transfer System) and is well suited for medium-sized defects.
Microfracture
Microfracture is a minimally invasive technique in which tiny holes are drilled into the bone beneath the cartilage defect. This releases stem cells from the bone marrow, which then form a so-called fibrocartilage repair tissue. However, this tissue is mechanically less durable than native hyaline cartilage.
Allogeneic Cartilage Transplantation
Allogeneic transplantation uses cartilage tissue from a donor (e.g., from a tissue bank). This is an option for large defects when sufficient tissue from the patient cannot be obtained.
Diagnosis and Indications
Before cartilage transplantation, several diagnostic methods are used:
- MRI (Magnetic Resonance Imaging): The gold standard for assessing cartilage defects, their extent, and depth.
- Arthroscopy: Direct visual examination of the cartilage through a joint camera procedure.
- X-ray imaging: Used to assess joint space narrowing and bony changes.
Cartilage transplantation is generally recommended for well-defined, full-thickness cartilage defects (Grade III-IV according to the ICRS classification) in younger, active patients when conservative measures have not provided sufficient relief.
Procedure and Aftercare
The surgery is performed either arthroscopically (minimally invasive) or as an open procedure depending on the technique used. Postoperative rehabilitation is critical to success and includes:
- Partial weight-bearing on the operated joint for several weeks using crutches
- Physiotherapy to restore muscle strength, range of motion, and coordination
- Passive motion training (CPM device) in the first weeks after surgery
- Gradual increase of loading over several months
Full rehabilitation can take between 6 months and 2 years, depending on the method used and the size of the defect.
Risks and Complications
As with any surgical procedure, cartilage transplantation carries potential risks:
- Infection at the surgical site
- Graft failure or incomplete tissue integration
- Joint stiffness or restricted range of motion
- Persistent pain or swelling
- In allogeneic transplantation: minor immune reactions are possible
References
- Brittberg M. et al. - Treatment of Deep Cartilage Defects in the Knee with Autologous Chondrocyte Transplantation. New England Journal of Medicine, 1994.
- Mithoefer K. et al. - Clinical Efficacy of the Microfracture Technique for Articular Cartilage Repair in the Knee. American Journal of Sports Medicine, 2009.
- Gomoll A.H. et al. - The subchondral bone in articular cartilage repair: current problems in the surgical management. Knee Surgery, Sports Traumatology, Arthroscopy, 2010.
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