LAUSR

BACKGROUND: “Why try to convert other collagen substitutes into ligament if the original can be preserved?” said Sherman1. Nowadays, reconstruction became the gold standard treatment for ACL injuries. Despite current treatment, secondary knee osteoarthritis has been described in more than 70% of the injured patients after 10 years follow up.2 Recent studies have reported that tears involving the proximal ACL have an intrinsic healing response. This response has been compared to the one observed in MCL injuries.3, 4. OBJECTIVE: The aim of this study is to initiate a scientific analysis of our experience in patients diagnosed with an acute, proximal ACL tear treated with a primary repair arthroscopic technique. We suggest the creation of a symposium that reconsiders the ACL repair as a tool for treatment, on a selected subset of patients. METHODS: We analyzed retrospectively the data of 12 consecutive patients diagnosed clinically and radiologically (MRI) with proximal ACL tears in our clinic. The inclusion criteria were: proximal ACL tear (type 1 tear in Sherman´s classification), good remaining ACL quality tissue and less than 3 months from injury. The mean age at time of surgery was 33 years (16 to 55). Patients included in this study are athletes either at an amateur or professional level. The technique consists of an anatomical reinsertion of native ACL by reinforcing the anteromedial and posterolateral bundles of the ACL with a series of high strength locking Bunnell-type sutures, moving up the ligament from distal to proximal with an arthroscopic suture passer. The normal ACL insertional footprint within the notch is then debrided to provide a bleeding surface for healing. Finally, the torn ligament is opposed to the native footprint using 1-2 absorbable anchors that recreate the anatomic bundle insertional sites of the native ACL. RESULTS: Associated injuries were found in 7 of the 12 patients, these included 4 knees with lateral and 1 with medial meniscal tear which were repaired in the same procedure. Also, one knee had a medial bucket handle tear, partial meniscectomy was performed, and one knee with a combined ACL/MCL injury in which the MCL was simultaneously repaired. In our ongoing series, were excluded patients that had sustained complex knee injuries with multi-ligament damage (except ACL/MCL injuries), those with ACL re-ruptures, and previous knee surgery with cartilage repair procedures. Validated functional outcomes scores were collected after a mean follow up of 20 months (14-26). For the IKDC subjective score 11 of 12 patients rated their knees as normal or nearly normal. Lachman and Pivot Shift was negative in all patients. Lysholm score postoperatively averaged 93.5 ± 7; preoperatively 48 ± 7. Tegner preinjury 7.5 ± 1.2 postinjury: 7 ± 1.4. The KT-1000 knee arthrometer, objectively measured < 3 mm of anterior tibial motion relative to the femur in the injured knee compared to the non-injured knee at all levels of force, including manual max tests, in all patients included in the study. No complications or further surgeries are reported up to date. CONCLUSION: The keys to success include: Proper patient selection, early intervention, all arthroscopic technique, appropriate suture control of the torn ACL fibers, and stable opposition to a bleeding bone surface at the native attachment site within the femoral notch. Long-term data is pending. However, basic science and early clinical studies are promising. REFERENCES Mark F. Sherman, MD, Lawernce Lieber, MD, Joel R. Bonamo, MD, Luga Podesta, MD, Ira Reiter, RPT., The long-term followup of primary anterior cruciate ligament repair, 1991, The American Journal of Sports Medicine, Vol. 19, No 3. Martha M. Murray, MD. Current Status and Potential for Primary ACL Repair. 2009. Clin Ssports Med. Duy Tan Nguyen, Tamara H. Ramwadhdoebe, Cor P. van der Hart, Leendert Blankervoort, Paul Peter Tak, Cornelis Niek van Dijk., Intrinsic Healing Response of the Human Anterior Cruciate Ligament: An Histological Study of Reattached ACL Remnants, 2014, Journal of Orthopaedic Research. Martha M. Murray, MD, Braden C. Fleming, Ph.D., Use of a Bioactive Scaffold to Stimulate ACL Healing Also Minimizes Post-traumatic Osteoarthritis after Surgery, 2014, American Journal of Sports Medicine. Primary ACL Repair vs Reconstruction: Investigating the Current Conventional Wisdom