Background: Anterior cruciate ligament (ACL) reconstruction (ACLR) is the gold-standard treatment for ACL rupture; however, graft failure remains a significant concern, particularly in young, active, or high-risk patients. The addition of a Lateral Extra-Articular Procedure (LEAP) has been proposed to enhance rotational stability and reduce the risk of graft rupture. This systematic review and meta-analysis aimed to determine whether adding LEAP to primary ACLR reduces graft failure rates compared to isolated ACLR, with a minimum follow-up of two years. Methods: A comprehensive literature search was conducted across PubMed, Scopus, Embase and Cochrane Library databases in accordance with PRISMA guidelines. Eighteen comparative studies with a minimum 24-month follow-up were included, encompassing 7336 patients (3857 undergoing isolated ACLR and 3479 undergoing ACLR with LEAP). The primary outcome was graft failure rate. Data were analyzed using the Mantel–Haenszel method with a fixed-effects model to calculate pooled risk ratios (RR) and 95% confidence intervals (CI). Results: Pooled analysis demonstrated a significant increase in graft rupture risk in the ACLR-alone group compared to ACLR + LEAP (RR 2.72; 95% CI: 2.23–3.32; p < 0.00001), with negligible heterogeneity (I² = 0%). LEAP was particularly beneficial in high-risk populations such as young athletes and individuals with high-grade pivot shift or ligamentous laxity. Secondary outcomes showed improved rotational stability and comparable patient-reported outcomes and complication rates between groups. Conclusions: ACLR alone presents a higher risk of graft failure in comparison with the ALCR + LEAP technique. Furthermore, the addition of LEAP to ACLR improves rotational stability without increasing complications. LEAP should be selectively considered in patients with high-risk profiles or persistent intraoperative instability. These findings support the incorporation of LEAP as a valuable adjunct in modern ACL reconstruction strategies.

Background: Posterior cruciate ligament reconstruction (PCLR) remains one of the most technically demanding procedures in knee ligament surgery, with complication rates considerably higher than those observed for other arthroscopic procedures. Residual laxity, arthrofibrosis, neurovascular injury, tunnel-related complications, and heterotopic ossification (HO) represent the most frequent adverse events. With increasing surgical volumes and complexity—particularly in multiligament knee injuries (MLKIs)—structured, evidence-based strategies for complication avoidance are essential. The objective of this review is to provide a comprehensive, evidence-based overview of the main complications associated with PCLR and to propose a structured, reproducible protocol for complication prevention integrating current literature and high-volume institutional experience. Methods: A narrative review of the literature was conducted using PubMed and Google Scholar to identify clinical, biomechanical, and systematic studies on PCLR complications published between 2010 and 2025. Overall, 58 studies were screened and 33 were included for qualitative synthesis. Among the included studies, the level of evidence was Level I in five systematic reviews/meta-analyses, Level III–IV in seven observational clinical studies and registries, and Level V in biomechanical studies, narrative reviews, and expert consensus reports. In parallel, the recommendations were informed by the cumulative experience of a high-volume tertiary referral center with 187 PCLR procedures performed between 2010 and 2025 (136 MLKI, 51 isolated). Results: Evidence identifies several key predictors of postoperative complications: low posterior tibial slope (<6.54°), small graft diameter (90°) significantly improving safety. Suture tape augmentation (STA) reduces graft elongation by 45–58% and is associated with improved biomechanical stability without increasing complication rates. Early controlled motion is critical to prevent arthrofibrosis, whereas HO—affecting up to 45% of MLKI patients—requires delayed surgical excision after maturation. Conclusions: Optimal outcomes after PCLR derive from a structured, complication-focused approach encompassing anatomical risk assessment, meticulous tunnel planning, neurovascular protection, biological augmentation, and disciplined postoperative rehabilitation. Adoption of standardized protocols—particularly in MLKIs—can substantially reduce the incidence of adverse events and improve long-term knee stability.