This paper describes the formation and baseline demographics of the MARS cohort — the largest multicenter revision ACL reconstruction registry assembled at the time. It characterizes 460 patients across 87 surgeons to lay the groundwork for identifying modifiable predictors of revision ACL outcomes. No outcome data are reported here; this is a baseline epidemiologic snapshot of who these patients are and why their grafts failed.
When a patient presents with a failed ACL reconstruction, the instinct is to blame technique — but MARS data show a combination of factors (technical + traumatic + biologic) is the most common cause (37%), not isolated technical error.
Femoral tunnel malposition drives 80% of technical failures. This is the evidence base for why anatomic tunnel placement is the central principle of modern ACL surgery, and why anteromedial portal drilling has largely supplanted the transtibial approach for femoral tunnel creation.
Before scheduling a revision, counsel your patient that 90% of revision ACL knees have meniscal or chondral damage. The ligament failure is usually just the most visible problem. Preoperative MRI and an honest conversation about long-term cartilage health are essential.
Allograft is the practical reality in revision surgery (54% of cases) because prior autograft harvest eliminates the most familiar options. Knowing the prior graft source before the revision clinic visit lets you plan graft selection in advance rather than improvising intraoperatively.
This paper describes the formation and baseline demographics of the MARS cohort — the largest multicenter revision ACL reconstruction registry assembled at the time. It characterizes 460 patients across 87 surgeons to lay the groundwork for identifying modifiable predictors of revision ACL outcomes. No outcome data are reported here; this is a baseline epidemiologic snapshot of who these patients are and why their grafts failed.
When a patient presents with a failed ACL reconstruction, the instinct is to blame technique — but MARS data show a combination of factors (technical + traumatic + biologic) is the most common cause (37%), not isolated technical error.
Femoral tunnel malposition drives 80% of technical failures. This is the evidence base for why anatomic tunnel placement is the central principle of modern ACL surgery, and why anteromedial portal drilling has largely supplanted the transtibial approach for femoral tunnel creation.
Before scheduling a revision, counsel your patient that 90% of revision ACL knees have meniscal or chondral damage. The ligament failure is usually just the most visible problem. Preoperative MRI and an honest conversation about long-term cartilage health are essential.
Allograft is the practical reality in revision surgery (54% of cases) because prior autograft harvest eliminates the most familiar options. Knowing the prior graft source before the revision clinic visit lets you plan graft selection in advance rather than improvising intraoperatively.