BEAR vs ACL Reconstruction: Higher Failure Rate with Bridge-Enhanced Repair?

The emerging promise of bridge-enhanced ACL repair (BEAR) – an alternative to traditional anterior cruciate ligament (ACL) reconstruction – may be tempered by higher failure rates, according to data presented this week at the American Academy of Orthopaedic Surgeons (AAOS) Annual Meeting in New Orleans. While the BEAR implant demonstrated a lower rate of postoperative complications, a retrospective review suggests it may not offer the same long-term durability as conventional ACL reconstruction, particularly in certain patient populations.

A New Approach to ACL Tears

ACL injuries are common, especially among athletes and often require surgical intervention to restore knee stability. Traditional ACL reconstruction involves replacing the torn ligament with a graft – typically harvested from another part of the patient’s body (autograft) or from a donor (allograft). BEAR, developed by Miach Orthopaedics, offers a different approach. It utilizes a collagen-based implant to encourage the body’s natural healing response, aiming to bridge the torn ends of the ACL and allow them to heal without the need for a full reconstruction.

Study Findings: Complications Down, But Failure Rates a Concern

The study, led by Laith M. Jazrawi, MD, FAAOS, and colleagues at NYU Langone Health, retrospectively analyzed data from 106 patients – 42 who underwent BEAR and 64 who had ACL reconstruction with either allograft or autograft tissue. Researchers tracked reoperation rates, re-tear incidence, range of motion, and postoperative complications for a minimum of one year. The findings revealed a significantly lower complication rate in the BEAR group (9.5%) compared to the ACL reconstruction group (32.8%). But, the failure rate for BEAR was nearly double that of ACL reconstruction, even though this difference did not reach statistical significance.

“Despite the enthusiasm for the BEAR implant and the utilization of it as a means to avoid a typical reconstruction, which we realize long term has had excellent outcomes, we may be a little more tempered in terms of proceeding with the BEAR on everyone,” Dr. Jazrawi told Healio.

Flexion Range of Motion

Patients who received the BEAR implant also experienced a significantly reduced flexion range of motion at their final follow-up compared to those who underwent ACL reconstruction. This suggests a potential limitation in regaining full knee mobility with the BEAR procedure.

Understanding the Study’s Limitations

It’s important to note that this study was a retrospective review, meaning researchers looked back at existing data rather than conducting a randomized controlled trial. Retrospective studies are valuable for identifying trends, but they are susceptible to biases and cannot definitively prove cause-and-effect relationships. The study cohort also consisted of patients with specific types of ACL tears – Sherman type 1 or type 2 tears, which are femoral avulsions – selected since they were thought to be particularly well-suited for the BEAR implant. Despite this targeted selection, the higher failure rate observed raises questions about the implant’s effectiveness even in this favorable group.

What Does This Mean for Patients?

The findings suggest that BEAR may not be a universally superior option to ACL reconstruction. While it offers the benefit of avoiding a graft harvest and potentially reducing complications, the increased risk of failure warrants careful consideration. The decision of whether to pursue BEAR or ACL reconstruction should be made on a case-by-case basis, taking into account the patient’s individual tear pattern, activity level, and overall health. Healio provides ongoing coverage of orthopedic advancements, including updates on ACL repair techniques.

ACL Reconstruction: A Well-Established Procedure

ACL reconstruction has a long track record of success, with numerous studies demonstrating its ability to restore knee stability, and function. The procedure involves replacing the torn ACL with a graft, typically sourced from the patellar tendon, hamstring tendons, or a donor. While ACL reconstruction does involve a more invasive surgical approach and potential complications related to graft harvesting, it generally offers predictable and durable results. The American Academy of Orthopaedic Surgeons provides comprehensive information on ACL injuries and treatment options on their website: https://orthoinfo.aaos.org/.

The Role of Patient Selection

Dr. Jazrawi emphasized the importance of careful patient selection when considering BEAR. The study findings suggest that the implant may be most appropriate for patients with specific types of ACL tears and a lower demand for high-level athletic activity. Further research is needed to identify the ideal candidates for BEAR and to determine the long-term outcomes of the procedure.

What Comes Next: Ongoing Research and Refinement

The field of ACL repair is constantly evolving. Researchers are continuing to investigate new techniques and technologies to improve outcomes and minimize the risks associated with ACL injuries. Future studies will likely focus on refining patient selection criteria for BEAR, optimizing the implant design, and developing rehabilitation protocols to maximize healing potential. The ongoing evaluation of BEAR and other innovative ACL repair methods will ultimately help clinicians provide the best possible care for patients with ACL tears. For more information, contact Marlene Naanes at [email protected].