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Autologous chondrocyte implantation (ACI, ATC code M09AX02 ()) is a biomedical treatment that repairs damages in articular cartilage.ACI provides pain relief while at the same time slowing down the progression or considerably delaying partial or total joint replacement (knee replacement) surgery.
Stem cells enable surgeons to grow replacement cartilage, which gives the new tissue greater growth potential. [11] [12] While there are few long-term studies as of 2018, a history of knee problems [13] and body weight are factors for how well the procedure will work. [14]
Cartilage is a slow adapting substance. Where a muscle takes approximately 35 weeks to fully adapt itself, cartilage only undergoes 75% adaptation in 2 years. If the rehabilitation period is too short, the cartilage repair might be put under too much stress, causing the repair to fail.
It is used to treat symptomatic, full-thickness cartilage defects of the knee with or without bone involvement. [2] [1] Autologous cultured chondrocytes on porcine collagen membrane is an autologous cellularized scaffold product. [1] This treatment is approved by the US Food and Drug Administration (FDA). [1] It is only administered to adults. [1]
The procedure is less effective in treating older patients, overweight patients, or a cartilage lesion larger than 2.5 cm. [11] Further on, chances are high that after only 1 or 2 years of the surgery symptoms start to return as the fibrocartilage wears away, forcing the patient to reengage in articular cartilage repair.
The selection and use of essential medicines: report of the WHO Expert Committee, 2017 (including the 20th WHO Model List of Essential Medicines and the 6th Model List of Essential Medicines for Children). Geneva: World Health Organization. hdl: 10665/259481. ISBN 978-92-4-121015-7. ISSN 0512-3054. WHO technical report series; no. 1006.
While the bone formation usually spans the entire duration of the healing process, in some instances, bone marrow within the fracture has healed two or fewer weeks before the final remodelling phase. [citation needed] While immobilization and surgery may facilitate healing, a fracture ultimately heals through physiological processes.
Articular cartilage stem cell paste grafting was initially described by Kevin R. Stone M.D., a San Francisco-based orthopedic surgeon, in 1997 . The technique was devised in response to reports that many of the contemporary cartilage restoration procedures lead to the development of fibrocartilage, not true hyaline articular cartilage. Knowing ...