ACL Reconstruction: Meniscal Repair vs. Partial Meniscectomy & Revision Risk

New research presented at the American Academy of Orthopaedic Surgeons (AAOS) Annual Meeting suggests that preserving the meniscus during anterior cruciate ligament (ACL) reconstruction may lead to better long-term outcomes for patients, potentially reducing the need for further surgery or even total knee replacement. The findings underscore the importance of prioritizing meniscal repair whenever feasible during ACL reconstruction procedures.

The Complex Relationship Between ACLs and Menisci

The ACL is a crucial ligament in the knee, providing stability. Tears are common, particularly among athletes. Often, ACL injuries occur alongside damage to the menisci – the cartilage that cushions the knee joint. Surgeons face a decision: repair the meniscus if possible, partially remove the damaged portion (partial meniscectomy), or, in some cases, do nothing immediately. This new data adds weight to the argument for aggressive meniscal repair when the anatomy allows.

Researchers, led by Vehniah K. Tjong, MD, FAAOS, FRCSC, of Northwestern University Feinberg School of Medicine, analyzed data from over 39,000 patients who underwent primary ACL reconstruction between 2000 and 2022, using the TriNetX database. The study categorized patients based on their meniscal treatment: repair, partial meniscectomy, or no meniscal treatment alongside the ACL reconstruction. The team then tracked outcomes, specifically looking at the rates of revision ACL surgery, further meniscal reoperations, and conversion to total knee arthroplasty (TKA).

The analysis revealed a concerning trend: patients who underwent partial meniscectomy after ACL reconstruction had a significantly higher risk of needing a second ACL reconstruction and ultimately requiring a total knee replacement compared to those who had a meniscal repair or no meniscal treatment. While meniscal repair itself was associated with a higher risk of needing *another* meniscal surgery, the overall long-term outlook appeared more favorable than with partial meniscectomy.

“Especially in the setting of an ACL reconstruction, if you see a meniscus that is reparable, please be aggressive and repair,” Dr. Tjong told Healio. “It can help our patients down the road not to undergo any arthroplasty or develop future arthritis and can also protect the graft that you place in.”

Understanding Meniscal Tears and Repair

The meniscus acts as a shock absorber and stabilizer within the knee joint. Damage to the meniscus can accelerate the development of osteoarthritis. A partial meniscectomy involves removing the damaged portion of the meniscus, which can alleviate immediate pain but alters the biomechanics of the knee. Meniscal repair, aims to restore the meniscus to its original function, preserving its cushioning and stabilizing role. But, repairs aren’t always possible, depending on the tear’s location, size, and the patient’s overall health and activity level.

The study highlights the trade-offs inherent in these treatment options. While meniscal repair carries a risk of needing further surgery, the potential long-term benefits of preserving the meniscus appear to outweigh that risk, particularly in the context of ACL reconstruction. This is because removing even a portion of the meniscus can disrupt the natural load distribution within the knee, potentially leading to accelerated cartilage breakdown and the need for a total knee replacement down the line. Healio reports that the findings were presented at the AAOS Annual Meeting on March 6, 2026.

Limitations and Future Research

It’s important to note that this study utilized a large database (TriNetX), which offers broad representation but also inherent limitations. Database studies rely on existing clinical data, which may not always be complete or standardized. The study was retrospective, meaning it looked back at past cases rather than following patients forward in time. This type of study can identify associations but cannot definitively prove cause and effect.

Dr. Tjong and her team acknowledge the need for further research to refine the understanding of which types of meniscal tears are most suitable for repair and how different repair techniques impact long-term outcomes. Specifically, they plan to investigate whether certain tear patterns are more strongly associated with graft failure or the development of arthritis. The U.S. Nuclear Regulatory Commission reported event notifications on the same date, March 6, 2026, though unrelated to this medical study.

Implications for Patient Care and Surgical Decision-Making

The findings from this study reinforce the growing consensus among orthopedic surgeons that meniscal preservation should be a primary goal during ACL reconstruction. Which means carefully evaluating the feasibility of meniscal repair and prioritizing it whenever possible. However, the decision to repair or perform a partial meniscectomy is complex and must be individualized based on the patient’s specific circumstances, including the tear’s characteristics, the patient’s activity level, and the surgeon’s expertise.

Patients undergoing ACL reconstruction should discuss the risks and benefits of all available meniscal treatment options with their surgeon. Understanding the potential long-term consequences of each approach is crucial for making an informed decision. The USPS PostalPro website lists industry alerts and notices, though these are unrelated to this medical topic. For patients seeking emergency information, the Emergency Email Network provides alerts for various situations.

Looking ahead, continued research and advancements in surgical techniques will likely further refine our ability to preserve the meniscus and optimize outcomes for patients undergoing ACL reconstruction. The ultimate goal is to restore knee function, prevent long-term complications, and help patients return to their desired activities.