After an anterior cruciate ligament, or ACL, tear is diagnosed and reconstruction is recommended, many patients ask: What ligament will be used? Will the surgeon take a tendon from my own body? Is a donated tendon better?

ACL reconstruction is not usually a simple repair of the torn ligament ends. Instead, a graft is used to create a new ACL-like structure that can restore knee stability.

Different grafts have different advantages and limitations. There is no single best graft for every patient, so the decision should reflect age, activity level, work demands, previous surgery, and the overall condition of the knee.

Many people imagine that a torn ligament can simply be sutured end to end. For most complete ACL tears, however, the blood supply is limited and the knee keeps moving, so the torn ends usually do not heal reliably.

For this reason, ACL reconstruction remains the mainstream treatment for many complete ACL tears. A new tendon graft is used to replace the torn ACL and gradually remodel into a functional ligament-like structure.

A graft is the new tissue used to reconstruct the ACL. After fixation, it gradually integrates with the bone and undergoes biological remodeling over several months before taking on the role of the ACL.

The grafts most commonly used in clinical practice are autografts and allografts. Synthetic ligaments may be considered in selected cases, but their routine use is more limited.

An autograft uses the patient’s own tendon. It is one of the most common choices for ACL reconstruction, especially for younger patients, active patients, and people who want reliable long-term stability.

The hamstring tendon is one of the most widely used ACL grafts worldwide. The surgeon takes part of the hamstring tendon from the inner side of the knee, prepares it, and uses it to reconstruct the ACL.

The bone-patellar tendon-bone graft, often called BTB, is another classic ACL graft. It uses the middle portion of the patellar tendon with small bone blocks at both ends, allowing relatively fast bone-to-bone healing.

This is one of the most common patient questions. Large bodies of research show that hamstring tendon and BTB autografts have broadly similar overall outcomes.

There is no clear major difference in knee stability, daily function, return to sport, or long-term clinical results for many patients. The more important differences are the types of postoperative discomfort and donor-site symptoms.

For this reason, surgeons usually choose based on the patient’s sport, work demands, and personal goals rather than assuming one graft is always more advanced. Clinical guidelines also regard hamstring tendon and BTB as recommended first-line autograft choices.

An allograft comes from donated human tissue. Its main feature is that the surgeon does not need to take tendon from the patient’s own body, so surgical trauma can be smaller.

Although allograft has advantages, studies have found a relatively higher risk of graft failure in young and highly active patients.

Therefore, many sports medicine centers internationally still prioritize autograft for young patients with high athletic demands. Clinical guidelines similarly recommend considering autograft first in most ACL reconstructions, with allograft mainly reserved for selected situations.

Synthetic ligaments have attracted attention in recent years. Their potential advantage is faster restoration of mechanical stability and, in theory, earlier rehabilitation.

However, long-term evidence remains limited. Some studies have reported problems such as reinjury, synovitis, joint effusion, and degenerative changes.

For most first-time ACL reconstruction patients, synthetic ligaments are not the routine first choice and should be considered carefully according to the specific case.

These factors together determine which graft is most appropriate. The goal is not to choose the newest or most expensive material, but the graft that best supports the patient’s stability needs, rehabilitation goals, and long-term activity plan.