Osteochondral allograft transplantation

"Osteochondral" refers to cartilage together with the bone directly beneath it; an "allograft" is tissue from a donor. In this procedure, a selected damaged area is replaced with a matched segment of donor cartilage and its underlying bone, resurfacing that focal part of the joint.

Because it replaces bone as well as cartilage, it may be considered particularly when the bone underneath the defect is also involved — for example after certain osteochondral injuries. It is one possible option for selected patients, not an automatic step, and not suitable for every lesion.

Several practical and clinical factors affect planning. A suitable donor graft has to be matched and available, which can affect timing. Beyond the graft itself, the lesion's characteristics, the overall environment of the knee, and any associated pathology all influence whether the procedure is appropriate and how it is approached. These are weighed individually with your surgeon.

Recovery is staged and individualized. Because the graft includes bone that must integrate with the patient's own bone, as well as a cartilage surface that must be protected, rehabilitation is designed to safeguard both. Your surgeon and physical therapist provide a specific plan, and the pace depends on the lesion, the graft, and any other procedures performed. When another procedure is done at the same time, the plan is adjusted and the more protective restrictions generally govern. Your surgical team's instructions always take precedence.

As with other cartilage procedures, the result can be less durable if an important contributing problem is left unaddressed. Depending on the individual knee, a surgeon may consider treating alignment, patellar tracking or instability, ligament instability, or meniscus deficiency — at the same operation or in a staged manner — so the graft is protected. Whether any of that applies is individualized and is not part of every plan.

This procedure has real risks and limits. The graft may fail to incorporate, symptoms may persist, and graft-related problems, stiffness, infection, or the need for additional surgery are possible. Because the graft is donor tissue, there is also a small risk of disease transmission; donor grafts are screened and processed to reduce this risk, though it cannot be eliminated entirely. It does not create genuinely "normal" cartilage. This page makes no claim that it is superior to other options, that it will last a particular length of time, that it prevents arthritis, or that it guarantees a return to any specific sport. These trade-offs are discussed individually with your surgeon.